Garlic

The Ancient Journey: From Wild Steppes to the Pharaohs' Table

The history of garlic spans over 7000 years (Welbaum, 2015). It is believed to have originated in Central Asia, specifically the mountain regions of the Tien Shan, Turkmenistan, Uzbekistan, and northern Iran (Brewster, 2008; Block, 2010). Interestingly, the true wild ancestor of modern garlic has not been definitively identified. For a long time, the species Allium longicuspis was thought to be the ancestor, but genetic analysis has disproven this. Some researchers suggest that the ancestor could have been Allium tuncelianum, but this hypothesis also remains unconfirmed. Thus, the "lost ancestor" of garlic remains one of botany's intriguing mysteries (Block, 2010).

From this region, garlic began its triumphant journey across the globe. It is believed that traders along the Great Silk Road introduced it to the Mediterranean (Block, 2010). Archaeological findings confirm its incredible antiquity:

• Mesopotamia: Clay tablets from Babylon (around 1600–1700 BCE) mention recipes where garlic ("hazanu") and onions are key ingredients. For example, a recipe for "Stewed Turnips" instructed: "Squeeze the juice from leek and garlic and pour it over the dish" (Block, 2010).
• Ancient Egypt: Garlic was more than just food; it was a significant element of culture and medicine. It was part of the diet of pyramid builders, as it was considered a strengthening agent (Block, 2010). Depictions of garlic and onions are found on tomb walls. The most famous find is the well-preserved garlic bulbs in Tutankhamun's tomb (1325 BCE). Garlic was also used in the mummification process (Block, 2010).
• Ancient Greece and Rome: The Greeks called garlic "skorodon," and the Romans, whose legions spread it throughout Europe, considered it food for warriors. It was believed to instill courage and strength, so the Roman army actively consumed it. Pliny the Elder, in his "Natural History," documented numerous recipes featuring garlic for treating various ailments (Block, 2010).
• Ancient China and India: In China, garlic ("suan") has been known since ancient times and is mentioned in the "Book of Songs" (Shi Jing), compiled by Confucius (551–479 BCE). It was used both for culinary and ritual purposes (Block, 2010). In India, garlic is mentioned in ancient medical texts, although its consumption was prohibited in some religious traditions (Buddhism, Jainism) due to its strong odor (Brewster, 2008).

Spread and Ambivalent Attitudes

Garlic has always evoked mixed feelings. In Ancient Egypt, it was valued, yet priests were forbidden from eating it. In 19th-century Europe, English writers described its "fetid odor" with disgust, yet it was grown and used in folk medicine throughout Europe (Block, 2010). In the Middle Ages in France, garlic was even used in the famous "Vinegar of Four Thieves" as protection against the plague (Block, 2010). In Asia, conversely, Buddhist monks in some traditions excluded it from their diet due to its strong smell, which was believed to stir the senses (Block, 2010).

This "split personality" did not prevent garlic from spreading worldwide. Spanish and Portuguese conquistadors brought it to the Americas, and from there, it reached sub-Saharan Africa (Welbaum, 2015; Block, 2010). Today, garlic is a global crop, grown on practically every continent.

Garlic Today: Global Figures and Regions

Today, China is the absolute world leader in garlic production, accounting for over 75% of the global harvest (approximately 12 million tons annually). India is a distant second (Brewster, 2008; Welbaum, 2015). According to the Food and Agriculture Organization (FAO) data from 2007, world garlic production exceeded 15 million tons (Block, 2010).

In different parts of the world, garlic has adapted to local conditions, leading to the emergence of numerous varieties and subspecies. This diversity, which we will explore in detail in Chapter 7, holds immense practical significance for every gardener. Understanding which garlic is "winter" and which is "spring," and which varieties suit your climate, directly stems from its millennia-long history of adaptation.

Key Takeaway for Gardeners: Knowing that garlic originates from mountainous regions with pronounced seasonality (cold winters, dry summers) helps explain its two main requirements: the need for a cold period to initiate bulb formation (vernalization) and its drought tolerance. This understanding is the foundation for choosing the correct cultivation method (winter or spring planting).

Botanical Placement

Let's clarify its position within the botanical hierarchy.

• Class: Monocotyledons (Monocotyledons)
• Order: Asparagales (Asparagales)
• Family: Amaryllidaceae (Amaryllidaceae), subfamily Allioideae (Allioideae)

Important Clarification: In older literature, garlic and other onions were often placed in the Lily family (Liliaceae) or treated as a separate family Alliaceae (Alliaceae). However, modern systematics (based on molecular data) places them within the subfamily Allioideae under the family Amaryllidaceae (Brewster, 2008; Welbaum, 2015). For the gardener, this means garlic is more closely related to amaryllis and daffodils than to lilies, which explains similarities in bulb and flower structure.

Genus: Allium (Allium). This is one of the largest plant genera in the world, comprising 600 to 780 species (Block, 2010; Brewster, 2008). All possess a characteristic odor due to sulfur-containing compounds.

Species: Garlic – Allium sativum L.

Etymology: The Latin "sativum" means "cultivated," "sown," indicating that this species is not found in the wild (Block, 2010). It is a fully domesticated plant.

Subspecies and Main Varieties

Within the species Allium sativum, two main subspecies are distinguished, which have significant practical implications for choosing cultivation methods and storage:

1. Softneck Garlic (Allium sativum ssp. sativum):

• This is the most common type in commercial production. It does not produce a flowering stalk (scape) or forms only a very short, rudimentary one.
• The stem (false stem) remains soft after maturity, allowing the garlic to be braided.
• Characterized by a large number of cloves (up to 24) arranged in several layers. Outer cloves are larger, inner ones are smaller.
• Typically stores better than hardneck varieties (Block, 2010; Welbaum, 2015).
• Prefers milder winters.

2. Hardneck Garlic (Allium sativum ssp. ophioscorodon):

• These varieties produce a flowering stalk (scape) that initially coils into loops and then straightens. An inflorescence with aerial bulbils forms at the tip of the scape.
• The stem at the base of the bulb is hard and woody.
• Cloves are arranged in a single layer (usually 4–11 large cloves) around a central stem.
• Considered to have a more pronounced and pungent flavor.
• Better adapted to cold winters but stores less well.
• Removing scapes (snapping them off) is a mandatory agronomic practice to increase bulb size (Block, 2010).

Degeneration and Vegetative Propagation

Garlic is a sterile plant. It practically does not produce seeds. In nature, without human intervention, the species would not exist. Every garlic plant is a clone, created through vegetative propagation. For thousands of years, gardeners selected the best bulbs for planting, leading to enormous varietal diversity but also to a major problem: degeneration.

Main causes of garlic degeneration:

1. Accumulation of Diseases and Pests: Since every plant is a clone, viruses, bacteria, and nematodes that infect one bulb can spread throughout the entire population. Viral infections are particularly dangerous.

2. Lack of Sexual Reproduction: Sexual reproduction involves genetic recombination, providing offspring with resistance to new conditions and diseases. Garlic lacks this mechanism.

What can be done?

The solution lies in renewing the planting material. This can be achieved by:

• Purchasing healthy, certified material from nurseries and reputable suppliers. Such garlic undergoes treatment to eliminate viruses.
• Propagating garlic via bulbils (aerial bulbs): This is a practical way to rejuvenate a variety. Bulbils form in the inflorescences of hardneck varieties. When planted, they produce a single large clove (a "round") in the first season, and the following year, that round produces a full multi-cloved bulb. Pests and diseases that affect the mother plant generally do not transfer through bulbils (Autko et al., 2012).
• Using "fertile" forms: In recent decades, wild and semi-wild forms of garlic capable of seed reproduction have been found in Central Asia (Kazakhstan, Kyrgyzstan) (Block, 2010). Active work is underway to create new varieties from these seeds, opening up a future for garlic breeding. However, such varieties have not yet reached widespread commercial distribution.

Close Relatives (What else is in the Allium genus?)

The genus Allium is vast. Knowing its representatives helps avoid confusion and plan plantings effectively.

• Onion (Allium cepa): The closest relative within the family. It is distinguished by hollow (tubular) leaves, unlike the flat, strap-like leaves of garlic.
• Elephant Garlic or Leek (Allium ampeloprasum): This is not a true garlic but a separate species, which includes leek, kurrat, and pearl onion. Elephant garlic bulbs resemble garlic but contain fewer (4-8) very large cloves with a milder flavor. Botanically, it is closer to leek (Block, 2010; Welbaum, 2015).
• Wild Garlic (Ramsons, Bear's Garlic, Allium ursinum): Grows in European forests. Its leaves resemble those of lily-of-the-valley. Popular in cooking as an early green. Important: It can be easily confused with the poisonous autumn crocus (Colchicum autumnale), which can lead to poisoning (Block, 2010).
• Victory Onion (Alpine leek, Allium victorialis): Found in mountains and forests, used as a leafy green vegetable.
• Field Garlic (Allium vineale): A pernicious weed for farmers. Its leaves smell like garlic. If this weed gets into wheat or hay, it can impart its odor to the grain and milk, reducing product quality (Block, 2010).

Key Takeaway for Gardeners: It's important to remember that garlic is a sterile clone. Therefore, you cannot use your own planting material year after year indefinitely; this will lead to degeneration and reduced yields. Plan to periodically (every 3–5 years) renew varieties by purchasing seed bulbs from reliable suppliers or by practicing cultivation from bulbils. Understanding botanical systematics also clarifies crop rotation logic: avoid planting other Allium species after garlic, as they share common diseases and pests.

General Plant Structure

Garlic is a perennial herbaceous plant, but in cultivation, it is grown as an annual or biennial crop. Unlike many other vegetables, garlic does not typically reproduce by seeds but is a vegetatively propagated clone (Block, 2010). The plant consists of the following main parts:

1. Root System

• Type: Fibrous, weakly developed (Balashev and Zeman, 1981; Autko et al., 2012).
• Structure: Thread-like roots that branch poorly. The bulk of the roots are in the topsoil layer (25–30 cm), although individual roots can penetrate to a depth of 50–60 cm (Balashev and Zeman, 1981).
• Characteristics: Roots emerge from the basal plate (stem base) of the clove. The root formation process starts at very low temperatures (around 0°C), which is crucial for winter garlic. By the end of the growing season, old roots die off, but before maturity, winter garlic forms new "contractile" roots that pull the bulb deeper into the soil (Autko et al., 2012).
• Practical Implication: Due to its weak and shallow root system, garlic is very demanding regarding soil moisture and the looseness of the top layer. Watering should be regular, and cultivation (hoeing) should be shallow to avoid damaging the roots.

2. Leaves

• Structure: Leaves are flat, linear, strap-shaped, with a groove on the upper surface and a keel below (Autko et al., 2012; Balashev and Zeman, 1981). Leaf length can reach 30–60 cm, width 0.5–2.5 cm. Each new leaf grows from within the previous one, and their sheaths together form the false stem.
• Number: Depending on the variety and conditions, the number of leaves per plant varies from 7–8 to 12–15 (Autko et al., 2012).
• Difference from Onion: Unlike the hollow (tubular) leaves of onions, garlic leaves are flat and stiffer. At the base, they transition into sheaths that form the false stem.
• Practical Implication: Yellowing and lodging of the leaves is the main signal for harvesting garlic. The condition of the leaves (number of dry, yellow ones) indicates the bulb's readiness for digging.

3. Bulb (Head)

This is the primary economically valuable part of garlic. It is a complex bulb consisting of several cloves (Balashev and Zeman, 1981).

Basal Plate (Stem Base): This is a highly shortened, flat or slightly convex stem. All cloves attach to it. It contains the growing points and root primordia. In a mature bulb, the basal plate becomes dry and corky (Autko et al., 2012).

Cloves: These are lateral buds (daughter bulbs) formed in the axils of the leaves (Balashev and Zeman, 1981). Each clove is an independent bud, covered by common dry scales. A clove consists of:

• Dry Scales: Outer, dense scales, often purple, brown, or white. They protect the clove from drying out and diseases.
• Fleshy Scale: This is the storage tissue containing nutrients.
• Basal Plate (its own miniature version): The base of the clove.
• Growing Bud: The apical bud, which will develop into a new plant upon planting (Autko et al., 2012).

Structure of the Bulb:

• Softneck Garlic (ssp. sativum): Cloves are arranged in several layers (3–5 layers) around a central soft stem. Outer cloves are the largest, inner ones are smaller. The number of cloves can reach up to 24.
• Hardneck Garlic (ssp. ophioscorodon): Cloves are arranged in a single layer around a central hard stem (the remnant of the scape). There are usually 4–11 cloves, but they are larger and more uniform.

4. Flowering Stem (Scape)

Forms only in hardneck varieties. It is a leafless, hollow but sturdy stem that initially grows coiled into loops ("pig's tail") and then straightens out (Autko et al., 2012; Block, 2010). At the end of the scape, an inflorescence forms—a spherical umbel covered by a dense spathe (covering).

5. Inflorescence and Aerial Bulbils

Inflorescence: In the wild, some forms may produce flowers, but in cultivated garlic, they are typically underdeveloped, sterile, and dry up without opening (Autko et al., 2012).

Bulbils: Instead of seeds, aerial bulbils develop in the inflorescence. These are vegetative reproductive organs. They have a similar structure to cloves but are smaller and more rounded. The number of bulbils varies from a few to 350–400 depending on the variety (Autko et al., 2012; Balashev and Zeman, 1981).

Significance of Bulbils:

1. Rejuvenation of the variety: This is a key method for combating garlic degeneration. Planting material grown from bulbils is often free from viruses and nematodes, as pests generally do not penetrate the inflorescence (Autko et al., 2012).

2. Increasing the multiplication rate: From one bulb, you can obtain hundreds of bulbils, allowing rapid propagation of a valuable variety.

3. Saving planting material: Instead of using large cloves for planting, bulbils can be used.

The Process of Scape Formation and Removal:

• For bolting varieties, removing scapes is a mandatory practice. If the scape is not removed, it diverts nutrients and reduces the bulb yield by 20–30% (Autko et al., 2012). Scapes are removed when they reach a length of 10–12 cm and begin to curl into a loop.

6. False Stem

As mentioned, the leaf sheaths tightly press together, forming a false stem. Its height in non-bolting varieties is 15–35 cm, and in bolting varieties, 20–50 cm. The flower stalk runs inside the false stem (in bolting forms). After the bulb matures, the false stem dries and becomes the "neck"—the condition of the neck (dry, soft) indicates that the garlic is ready for harvest.

Key Takeaways for Gardeners from Botanical Structure:

1. Planting Depth: Plant cloves strictly with the basal plate facing down, at a depth of 4–6 cm (from the tip of the clove to the soil surface) for winter varieties and 3–4 cm for spring varieties. This ensures proper rooting and growth.

2. The Scape is not an Enemy, but a Tool: In hardneck varieties, scapes should be removed to obtain large bulbs, but they can be left on selected plants to produce bulbils for rejuvenating the planting stock.

3. Signals for Harvest: Yellowing and lodging of leaves, drying of the neck, and cracking of the spathe covering the inflorescence are clear signs of garlic maturity. Delaying harvest is risky, as bulbs may split apart into individual cloves (Autko et al., 2012).

4. Storage Life: Softneck varieties store better precisely because they lack the hard central stem and have tighter-fitting dry scales.

Temperature Requirements (Thermophilia and Cold Hardiness)

Garlic is a temperate climate crop with distinct periods of growth and dormancy. Its temperature requirements change depending on the growth stage.

• Roots: Begin to germinate at temperatures around 0°C. The optimal temperature for root growth is +5…+10°C (Autko et al., 2012; Balashev and Zeman, 1981).
• Leaves: Begin to grow at +2…+5°C. The optimal temperature for leaf growth and development is +10…+15°C (Autko et al., 2012).
• Clove Formation: This process is most active at +15…+20°C (Autko et al., 2012).
• Bulb Maturation and Ripening: Requires higher temperatures — +20…+25°C (Balashev and Zeman, 1981).

Winter Hardiness:

Winter garlic is one of the most winter-hardy vegetable crops. In the rooting phase, it can withstand frosts down to –20…–25°C (with snow cover). Spring frosts down to –3…–5°C do not harm the seedlings (Balashev and Zeman, 1981).

Why is this important for the gardener to know?

1. Choosing Planting Dates: Winter garlic is planted in the fall, timed so that it has time to root (roots begin growing at 0°C) but does not start actively growing leaves before sustained cold sets in. This is usually 3–4 weeks before frost.

2. Harvest Timing: Ripening requires warmth. In a cold, rainy summer, ripening is delayed, which can reduce the storage life of the garlic.

3. Spring vs. Winter Garlic: Spring garlic does not require a long period of low temperatures for development (no vernalization needed), so it is planted in spring. Winter garlic needs a cooling period (overwintering) to form a normal bulb.

Light Requirements (Light Conditions and Photoperiodism)

Garlic is a long-day plant (Autko et al., 2012). This means that for normal development, clove formation, and bolting, it requires a day length of 14 hours or more.

• Short Day (less than 12–14 hours): If garlic is planted late in spring or grows under short days, nutrients are not stored, and cloves do not form in the bulb. The plant continues to grow leaves, resembling a leek (Autko et al., 2012). This is one reason why spring garlic is planted as early as possible.
• Long Day: Stimulates branching of the basal plate, bolting, and the translocation of nutrients from the leaves to the cloves, leading to the formation of a full bulb.
• Practical Implication: This is crucial knowledge for choosing planting times. Winter garlic, planted in autumn, encounters short days in spring (March–April), but after rooting, it grows leaves; when days become long (May–June), the process of clove formation is triggered. Spring garlic must be planted early in spring to fall into a favorable light regime.

Water Requirements (Water Regime)

Despite being a drought-tolerant plant (originating from the mountains of Central Asia), garlic is very demanding of soil moisture during specific periods.

Critical periods for water needs:

1. After planting (in autumn): Moist soil is required for rooting. Watering is necessary in dry autumn (Autko et al., 2012).

2. Spring growth (late April – May): During the phase of intensive leaf growth (at the end of the first month after emergence) — this is a critical period. Lack of moisture will result in weak plants (Autko et al., 2012).

3. Clove and Scape Formation (June): The second critical period—10–15 days after the start of clove formation. Abundant watering is needed at this time.

Important!

• Excess moisture at the end of the growing season (2–3 weeks before harvest): Harmful! It delays bulb maturation, reduces storage life, and promotes the development of fungal diseases (Autko et al., 2012; Balashev and Zeman, 1981).
• Optimal Moisture: For normal growth and development, soil moisture should be around 80% of field capacity (Autko et al., 2012).

Practical Implication:

1. Watering: Water garlic regularly in May and June, especially in dry weather. It's best to do this in the evening, applying a generous amount to the bed. After watering, be sure to loosen the soil (Autko et al., 2012).

2. Stop Watering: Stop watering completely 2–3 weeks before the expected harvest. This allows the garlic to mature and form tight, protective scales, crucial for storage.

Soil Requirements (Fertility and Texture)

Garlic is one of the most demanding crops regarding soil fertility (Autko et al., 2012). It prefers light, well-structured, highly fertile soils with a neutral reaction.

• Optimal pH: 6.0–7.0. On acidic soils, garlic is prone to disease and yields poorly. Liming should be done for the preceding crop (Autko et al., 2012).
• Texture: The best soils are light loams and sandy loams. Heavy clay soils that are prone to crusting are unsuitable because garlic's roots are weak and cannot easily penetrate dense ground (Autko et al., 2012; Balashev and Zeman, 1981).
• Fertility: Garlic responds very well to organic fertilizers but does not tolerate fresh manure! Fresh manure delays the growing season and promotes fungal diseases. Only well-rotted manure or compost should be applied to garlic (at a rate of 50–60 t/ha or 5–6 kg per m²) (Autko et al., 2012).
• Mineral Nutrition: Approximate fertilizer rates for garlic: nitrogen (N) — 90–120 kg/ha; phosphorus (P₂O₅) — 60–90 kg/ha; potassium (K₂O) — 90–120 kg/ha (Autko et al., 2012). Phosphorus and potassium fertilizers are applied in autumn, while nitrogen is applied in spring as top dressing.

Practical Implication:

1. Site Selection: Choose the sunniest spot in your garden with fertile, loose soil. Avoid low-lying areas where water stagnates.

2. Bed Preparation: 2–3 weeks before planting, dig the bed to a spade's depth, incorporate well-rotted manure (1–2 buckets per m²) and a complete mineral fertilizer (e.g., nitrophoska). For acidic soils, add dolomite lime or wood ash, preferably for the preceding crop.

3. Crop Rotation: Do not plant garlic in the same place more than once every 4–5 years. Good preceding crops include winter cereals, grasses, cucumbers, squash, early cabbage, and root vegetables. Avoid planting after potatoes (due to Fusarium) and onions (shared diseases and pests) (Autko et al., 2012).

Choosing a Region and Climate

Based on the above, garlic performs best in regions with:

1. Cold winters (for winter forms), but with reliable snow cover.

2. Moderately warm springs for good leaf development.

3. Dry and sunny summers for proper bulb maturation.

These are ideal conditions of a temperate climate. In regions with mild winters, softneck varieties perform better. In regions with harsh, snowless winters, winter garlic requires protection (mulching) or is grown as a spring crop.

Key Takeaway for Gardeners: Success in growing garlic is 90% dependent on matching the growing conditions (temperature, light, moisture) to its ecological needs. Violating any of these parameters leads to reduced yield and quality. It is especially important to remember the photoperiod requirement and the need to stop watering before harvest.

Life Cycle and Developmental Stages

In cultivation, garlic goes through several clearly distinguishable developmental phases. These phases have different requirements for temperature, moisture, and light. Depending on whether it is winter or spring garlic, these phases shift on the calendar, but their sequence and physiological essence remain unchanged (Balashev and Zeman, 1981; Autko et al., 2012).

Stage 1: Rooting (autumn for winter garlic, spring for spring garlic)

What happens: After planting a clove in the soil, roots are the first to start growing. They emerge from the basal plate. This process initiates at temperatures around 0°C.

Peculiarity: For winter garlic, this is a critical phase. The plant must form a robust root system before the onset of sustained frosts. If the root system is weak, the garlic will overwinter poorly.

Requirements: Moist, loose soil. Optimal temperature for root formation: +5…+10°C.

Practical Implication: Planting dates for winter garlic are calculated so that 3–4 weeks remain before the cold sets in. During this time, the roots should develop sufficiently, but the leaves should not start growing actively.

Stage 2: Vegetative Growth (spring)

What happens: With the arrival of spring warmth, active leaf growth begins. The first leaf appears 12–15 days after emergence, followed by subsequent leaves at intervals of 10–6 days. The leaf sheaths form the false stem (Balashev and Zeman, 1981).

Duration: In winter garlic, this stage lasts approximately 1.5–2 months (April – first half of May). In spring garlic, it is somewhat shorter, as it is planted later.

Peculiarity: During this phase, the foundation for the future harvest is laid. The more powerful the leaf apparatus, the larger the bulb will be.

Requirements: Leaf growth requires an initial temperature of +2…+5°C, followed by +10…+15°C. The plant needs nitrogen and moisture.

Practical Implication: During this phase (especially in a dry spring), abundant watering and nitrogen fertilization are required.

Stage 3: Clove Formation (May–June)

What happens: Approximately 90–100 days after emergence (for winter garlic), leaf growth slows down, and the translocation of plastic substances from the leaves to the basal plate begins. Branching of the basal plate starts—cloves form (Balashev and Zeman, 1981). The leaf sheaths thicken and transform into fleshy scales. Primordia of daughter bulbs appear after the 5th–6th leaf.

Critical Period: This is the second critical period for water needs (10–15 days after the start of clove formation) (Autko et al., 2012).

Trigger: The signal for the start of clove formation is the long day (more than 14 hours) (Autko et al., 2012; Brewster, 2008).

Practical Implication: During this phase, watering is especially important. If garlic experiences moisture stress during clove formation, the bulb will be small.

Stage 4: Bolting (in hardneck varieties)

What happens: In bolting varieties, the flowering stalk (scape) begins to grow in the center of the basal plate. The appearance of the scape signals that the formation of new leaves has ceased (Autko et al., 2012).

Practical Implication: Scapes must be removed (snapped off) as early as possible when they reach a length of 10–12 cm and begin to curl into a loop. If this is not done, the scape will divert nutrients, resulting in a significantly smaller bulb (by 20–30%) (Autko et al., 2012).

Exception: If you plan to propagate garlic using bulbils, leave the scapes on a few of the strongest plants to allow the aerial bulbils to mature.

Stage 5: Maturation and Dormancy (July–August)

What happens: Leaf and root growth ceases. Old roots die off. The leaf sheaths dry, the false stem softens and lodges (falls over). On the basal plate of winter garlic, before full maturity, new "contractile" roots may appear, pulling the bulb deeper into the soil.

Signs of Maturity:

• Yellowing and drying of leaves (starting from the lower ones).
• Lodging of the false stem (in non-bolting varieties).
• Cracking of the spathe covering the inflorescence (in bolting varieties, if scapes were left).
• Thinning and drying of the neck.

Requirements: During this phase, moisture is harmful. Watering is stopped 2–3 weeks before harvest; otherwise, maturation is delayed, and the storage life of the garlic decreases sharply (Autko et al., 2012; Balashev and Zeman, 1981). The optimal temperature for maturation is +20…+25°C.

Dormancy Period: After maturation, garlic enters a dormant period. The duration of dormancy varies among varieties. Softneck varieties generally have a longer dormancy period than hardneck varieties, which is why they store better (Brewster, 2008).

Why Does Garlic Degenerate? (A Key Question for Gardeners)

This is a major problem encountered by many gardeners. Garlic may start to shrink, become diseased, and produce fewer cloves. This phenomenon is called degeneration.

Causes of degeneration (Block, 2010; Welbaum, 2015):

1. Sterility and Cloning: As discussed in Chapter 2, cultivated garlic reproduces only vegetatively (by cloves and bulbils). This means all the plants in your bed are genetic clones of one ancestor plant.

2. Accumulation of Diseases and Pests: Since clones lack genetic diversity, they are equally vulnerable. Viruses, bacteria, fungi, and nematodes that infect one plant can accumulate unchecked in the planting material year after year. Viral infections are particularly dangerous; they reduce yield and quality without necessarily killing the plant, gradually weakening it.

3. Lack of Genome Renewal: With seed reproduction (as in onions), genes are exchanged, and offspring acquire new gene combinations that may be resistant to diseases. Garlic lacks this mechanism.

4. Improper Selection: Farmers and gardeners often use large, marketable bulbs for planting, leaving the smaller ones for eating. This can lead to "cultural selection" favoring large bulbs, but against a background of overall viral load, this only exacerbates the problem. For planting, you should select not the largest, but the healthiest bulbs.

How to Combat Degeneration? (Practical Solutions)

1. Regular Variety Renewal: The most reliable method is to purchase healthy, certified planting material from reputable nurseries or suppliers every 3–5 years.

2. Sanitation through Bulbils (Aerial Bulbs): This agronomic technique allows you to obtain planting material free from many diseases. Pests and pathogens (especially nematodes) do not penetrate the inflorescences, so garlic grown from bulbils is a kind of "quarantine" material.

• Scheme: Year 1 – planting bulbils, producing a single large clove (a "round"). Year 2 – planting the round, producing a full, healthy multi-cloved bulb.
• Selecting Healthy Material: Annually at harvest, select for planting only bulbs from the strongest, healthiest, and cleanest plants (no signs of disease). Calibrate (sort by size). Plant large cloves separately from small ones (Autko et al., 2012).
• Disinfecting Planting Material: Before planting, it is beneficial to soak the cloves in a solution of potassium permanganate or a specific fungicide.

Key Takeaway for Gardeners: Garlic degeneration is not a myth but an objective biological process caused by the lack of sexual reproduction. If you want to consistently harvest healthy and large yields, plan to renew your planting material. Don't wait until the garlic has fully degenerated—act proactively.

Summary Table of Garlic Development Stages

What Makes Garlic Garlic?

The unique pungent taste and characteristic odor of garlic are determined by the content of essential oils, which contain sulfur-containing compounds (Balashev and Zeman, 1981; Autko et al., 2012). These compounds are a result of the plant's evolutionary adaptation as a defense mechanism against pests and diseases (Block, 2010).

Key Component—Allicin.

• What it is: Allicin is the primary biologically active compound in garlic. It is a volatile compound that forms when cells are damaged (cutting, crushing, chewing) from its odorless precursor, alliin.
• How it works: Allicin is responsible for the characteristic burning taste and pungent odor.
• Why know this: Allicin is unstable and degrades rapidly upon heating (loss of pungency and beneficial properties). Therefore, to get maximum benefit, it's recommended to crush fresh garlic and let it "rest" for 10–15 minutes before cooking. Heat treatment reduces its antibacterial properties but preserves other beneficial components.

Main Components of Garlic (Dry Matter)

Garlic is a crop with a high dry matter content (around 35–42%) (Autko et al., 2012; Balashev and Zeman, 1981). This is a key indicator affecting yield, storage life, and processing.

Main components of dry matter:

1. Carbohydrates (Sugars): This is the bulk of dry matter (up to 53.3–78.9% of dry matter). They provide energy and the sweetish taste that emerges after heat treatment. Garlic is rich in polysaccharides (fructans), which are a form of carbohydrate storage (Brewster, 2008).

2. Proteins (Nitrogenous Substances): Protein content is around 6–7.9% of fresh weight (Autko et al., 2012). This is higher than in onions.

3. Essential Oils: 0.29–0.74% (Autko et al., 2012). As mentioned, responsible for taste, aroma, and antibacterial properties.

4. Vitamins:

• Bulbs: Contain vitamins C, B₁, B₂, PP (Autko et al., 2012; Balashev and Zeman, 1981).
• Leaves (greens): Contain vitamin A (carotene), making young garlic leaves a valuable green product (Autko et al., 2012).
• Minerals (Ash): 1.44% (Balashev and Zeman, 1981). Garlic is rich in potassium, calcium, phosphorus, and magnesium. A notable feature is its content of rare and essential trace elements:
• Selenium: A powerful antioxidant.
• Germanium: Stimulates the immune system.
• Silicon: Important for skin, hair, and connective tissue health.
• Others: Zinc, manganese, iodine, iron.
• Important: The content of trace elements strongly depends on the soil in which the garlic was grown. In poor soils, these elements will be less abundant.

Value of Garlic: Nutritional and Medicinal

Nutritional Value:

Garlic is not just a condiment; it is a complete food with high carbohydrate, protein, and fiber content. When roasted or baked, it loses its pungency and becomes a standalone side dish.

Medicinal and Preventive Properties:

These properties are due to the complex of biologically active substances, particularly allicin, phytoncides, and trace elements.

• Phytoncidal Activity: Garlic is a potent natural antibiotic. Its phytoncides can inhibit the growth of bacteria, fungi, and even some viruses (Balashev and Zeman, 1981; Autko et al., 2012). This is why it is so frequently used in folk medicine.
• Detoxification: Garlic helps eliminate heavy metals (lead, mercury, cadmium) from the body (Autko et al., 2012).
• Cardiovascular System: Lowers cholesterol levels, thins the blood, improves circulation.
• Immunity: Stimulates the body's defenses due to its high content of vitamin C, selenium, and other antioxidants.

Important: Despite its benefits, garlic consumption may be contraindicated for certain conditions (gastrointestinal issues, allergies). Consultation with a doctor is essential.

Influence of Growing Conditions on Composition

The chemical composition of garlic is not constant. It depends on numerous factors (Balashev and Zeman, 1981; Autko et al., 2012):

1. Variety: Softneck varieties often have a higher dry matter content and store better than hardneck varieties. Pungent varieties usually contain more essential oils.

2. Environmental Conditions: Garlic grown in mountainous regions can accumulate up to twice as much ascorbic acid as garlic from plains (Balashev and Zeman, 1981). Temperature and light affect the accumulation of sugars and essential oils.

3. Agricultural Practices:

• Nitrogen Fertilizers: Increase protein content but may reduce storage life.
• Phosphorus and Potassium Fertilizers: Improve storage life and promote sugar accumulation.
• Potassium: Important for sugar accumulation.
• Watering: Excess moisture at the end of the growing season reduces dry matter content.
• Harvest Timing: Under-ripe garlic has a low dry matter content and stores poorly. Over-ripe garlic shatters.

Changes in Composition During Storage

During storage, the chemical composition changes (Balashev and Zeman, 1981):

• Water Content: Decreases (shrinkage). Well-matured garlic loses 18–20% of its moisture during drying (Block, 2010).
• Carbohydrates: Consumed in respiration. Loss of sugars and vitamins over time is inevitable. The longer garlic is stored, the less juicy and sweet it becomes.
• Vitamins: Degrade.
• Sprouting: If storage conditions are violated (high humidity, temperature), new shoots begin to grow from the growth buds, leading to depletion of reserves and spoilage of the bulb.

Practical Takeaways for Gardeners:

1. For long-term storage, choose varieties with high dry matter content (typically pungent softneck varieties). Ensure proper maturation (stop watering) and appropriate storage conditions.

2. For fresh consumption during the season, hardneck varieties with succulent flesh are often preferred.

3. For medicinal purposes, freshly harvested, properly matured garlic is most valuable, as it contains the maximum amount of all active compounds.

4. Garlic greens (young leaves) are a valuable source of carotene and vitamin C. Use them in spring when other fresh vegetables are scarce.

Key Takeaway for Gardeners: The quality of garlic (taste, health benefits, storage life) is the result of the interaction between genetics (variety) and growing conditions (soil, water, fertilizers, climate). By managing these factors, you can obtain garlic with the properties you desire.

Two Main Subspecies: The Foundation of Choice

The entire diversity of cultivated garlic (Allium sativum) is divided into two large groups that determine the cultivation method, storage duration, and even appearance (Block, 2010; Brewster, 2008; Welbaum, 2015).

1. Softneck Garlic (Allium sativum ssp. sativum)

Characteristics:

• Does not produce a flowering stalk (scape), or forms a very short, rudimentary one.
• The stem (false stem) remains soft after maturity, allowing it to be braided.
• The bulb contains many cloves (up to 24) in several layers. Outer cloves are large, inner ones are small.
• Outer scales are dense and thin.

Advantages:

• Excellent storage life: stores for 9–12 months (Brewster, 2008; Welbaum, 2015).
• Versatility: suitable for mechanized harvest and processing.
• Better suited for warm climates with mild winters.

Where it grows: This is the primary type for commercial production, especially in California, China, and Southern Europe. In the temperate zone of Russia with harsh winters, it may freeze without protection.

Examples of popular varieties: 'California Early', 'California Late', 'Silverskin', 'Artichoke' (Brewster, 2008; Welbaum, 2015).

2. Hardneck Garlic (Allium sativum ssp. ophioscorodon)

Characteristics:

• Produces a flowering stalk (scape) that initially coils into loops and then straightens.
• The center of the bulb contains a hard, woody stem (the remnant of the scape).
• Cloves are arranged in a single layer around the central stem. Usually 4–11 cloves, but they are large and uniform.
• Outer scales are coarser, often with purple or brown striping.

Advantages:

• Better winter hardiness: well-adapted to cold winters (Block, 2010; Brewster, 2008).
• More pronounced flavor: often more pungent and aromatic than softneck.
• Possibility of bulbil propagation: providing healthier planting material.

Disadvantages:

• Stores less well: typically 4–7 months (Welbaum, 2015).
• Fewer cloves: but they are larger, which is convenient for cooking.
• Requires scape removal for large bulbs.

Examples of popular varieties: 'Rocambole', 'Purple Stripe', 'Porcelain', 'Asiatic' (Welbaum, 2015).

Comparative Table of Subspecies (for Quick Choice)

Classification by Groups (Cultivar Groups)

In addition to the two subspecies, garlic is divided into numerous cultivar groups (sometimes called "cultivars" or "sortotypes") that differ in appearance, flavor, and region of origin. American geneticist Gayle Volk, based on DNA analysis, identified 10 main groups (Block, 2010; Brewster, 2008).

Brief Overview of Main Groups:

1. Rocambole: Winter-hardy hardneck garlic with 6–11 large cloves that are easy to peel. Very aromatic but stores for a short time (about 5 months). Popular among gourmets (Welbaum, 2015).

2. Purple Stripe: Hardneck garlic with beautiful purple stripes on the outer scales. Stores for 5–7 months. Typically 8–12 cloves (Welbaum, 2015).

3. Porcelain: Hardneck garlic with large (4–6) cloves and very white, smooth outer scales ("porcelain" appearance). Very winter-hardy. Stores for 5–7 months (Welbaum, 2015).

4. Artichoke: Softneck garlic with 12–20 cloves arranged in several layers. Medium-pungent, high-yielding, stores well (6–9 months). A popular commercial variety (Welbaum, 2015).

5. Silverskin: Classic softneck garlic, most commonly found in supermarkets. Contains 8 to 40 cloves, with small, dense bulbs. Ideal for braiding, stores for up to a year (Welbaum, 2015).

6. Asiatic, Turban, Creole: These groups are better adapted to warm climates (subtropics). They mature earlier but have medium storage life. They often have bright, sometimes sweetish flavors (Brewster, 2008; Welbaum, 2015).

Spring and Winter Garlic: A Growing Method, Not a Variety

It's important to distinguish between the type of garlic (subspecies) and the growing method (spring or winter).

• Winter Garlic: Planted in autumn. It requires a period of low temperatures (vernalization) for normal development. Generally, both hardneck and softneck garlic can be winter varieties (though hardneck overwinter better).
• Spring Garlic: Planted in early spring. It does not require prolonged cooling to form a bulb. Spring garlic is typically softneck varieties, especially from southern regions. Spring garlic is generally smaller than winter garlic but stores significantly better.

Practical Implication: For temperate zones with cold winters, hardneck winter varieties are generally best. For southern regions with mild winters and for long-term storage, softneck varieties (both winter and spring) are suitable. Spring garlic is a good option for those who missed the autumn planting or want fresh garlic until the new harvest.

Classification by Use (Culinary Purpose)

The choice of variety also depends on how you plan to use it:

1. Universal Varieties: Suitable for both eating and storage. Many softneck varieties, such as 'Silverskin', fall into this category.

2. Salad (Dessert) Varieties: Have a mild, delicate, sometimes even sweetish taste. Often eaten fresh. Some hardneck varieties ('Rocambole') and southern groups ('Creole') are examples.

3. Pungent (Spicy) Varieties: High in essential oils. Ideal for sauces, marinades, and adjika. A typical representative is 'California Late' (Welbaum, 2015).

4. Varieties for Long-Term Storage: Typically softneck varieties with high dry matter content, e.g., 'Silverskin' or 'California Early'.

Regional Varieties: Russian and Belarusian Cultivars

For gardeners in the post-Soviet space, it is important to know about regionalized varieties adapted to local climates.

Russia and Belarus (Winter Bolting Varieties):

• 'Polet': A winter bolting variety included in the Belarusian State Register. Characterized by high winter hardiness and yield. Bulbs are dense, with 7–9 cloves (Autko et al., 2012).
• 'Yubileiny Gribovsky': One of the most popular varieties in Russia. Bolting, winter-hardy, high-yielding. Large bulb, 5–8 cloves, pungent flavor (Autko et al., 2012).
• 'Vitazhenets', 'Zavrat', 'Harnas', 'Polessky Suvenir', 'Zhemyay', 'Belovezhsky', 'Bosut', 'Soyuz', 'Junior' — other varieties of Belarusian and Russian breeding, included in the Belarusian State Register (Autko et al., 2012).
• 'Dungansky Mestny': Pungent, mid-season, bolting variety common in Central Asia (Balashev and Zeman, 1981).
• 'Yuzhny Fioletovy': A winter non-bolting variety with purple bulbs and a semi-sharp taste (Balashev and Zeman, 1981).

Russia and Belarus (Spring Varieties):

Spring garlic in these regions is primarily represented by non-bolting softneck varieties. They produce smaller but very long-storing bulbs. Modern sources mention specific spring cultivar names less frequently, but in practice, gardeners often grow local populations adapted to their region.

Key Takeaway for Gardeners: Garlic classification is not just botanical theory. It's a practical tool that helps answer the main questions:

• What to plant? — Hardneck for harsh winters, softneck for mild ones.
• When to plant? — Winter garlic in autumn, spring garlic in spring.
• How to store? — Softneck stores longer, hardneck stores shorter.
• What to eat? — 'Rocambole' for fresh salads, 'California Late' for pungent adjika.

Understanding these groups is the first step towards making an informed variety choice.

Step-by-Step Algorithm for Choosing a Variety and Growing Method

To avoid confusion, let's proceed stage by stage, from the most general conditions to a specific solution.

Step 1. Assess Your Climate and Region

This is the most important step, determining everything else.

Questions to ask yourself:

1. How harsh are your winters? (Do temperatures drop below –20°C without snow? How long does the ground freeze?)

2. What is your spring like? (Early and warm? Prolonged and cold?)

3. What is your summer like? (Hot and dry? Cool and humid?)

Possible solutions:

1. Cold winter (temperate Russia, Siberia, Urals, northern regions):

• Choice: Winter hardneck garlic. It offers the best winter hardiness. Prefer groups 'Rocambole', 'Purple Stripe', 'Porcelain', or local regionalized varieties ('Yubileiny Gribovsky', 'Polet', etc.) (Block, 2010; Welbaum, 2015).
• Growing method: Only winter (planting in autumn). Mulching for winter is essential.
• Spring garlic: In these regions, spring garlic (planted in spring) often fails to mature in the short summer or produces small bulbs.

2. Mild winter (southern regions, Black Sea area, Krasnodar Krai, Crimea):

• Choice: Softneck garlic. It doesn't require extreme winter hardiness and shows better yield and storage life. Groups 'Silverskin', 'Artichoke', 'Creole' (Welbaum, 2015; Brewster, 2008).
• Growing method: Can be planted as winter (autumn) or spring (spring). Winter planting gives larger bulbs.

3. Regions with unstable climates (frequent thaws, snowless winters):

• Choice: Prefer winter garlic, but with mulching and choosing winter-hardy (hardneck) varieties. An alternative is spring garlic, which is independent of winter conditions but requires early spring sowing.

Step 2. Define Your Main Goal: What Do You Need Garlic For?

Questions to ask yourself:

1. Do you need garlic for fresh eating (salads, sauces) during the season?

2. Do you need garlic for long-term winter storage (until the new harvest)?

3. Do you need garlic for processing (drying, pickling, canning)?

Possible solutions:

1. For "seasonal" eating (summer and autumn):

• Choice: You can choose any variety, but hardneck ('Rocambole', 'Purple Stripe') often have a more vibrant and complex flavor. They are ideal for fresh salads and sauces. Their disadvantage (shorter storage life) isn't an issue if you eat them first (Welbaum, 2015).

2. For long-term storage (until spring):

• Choice: Softneck garlic is your best bet. Varieties from the 'Silverskin' and 'Artichoke' groups have excellent storage life (up to 9–12 months). Spring garlic also stores very well (Brewster, 2008; Welbaum, 2015).

3. For processing (drying, garlic powder production):

• Choice: High dry matter content is important. Softneck varieties with high density, like 'California Late', are often used for these purposes (Brewster, 2008).

Step 3. Assess Your Agronomic Capabilities: Can You Plant Before Winter?

Questions to ask yourself:

1. Do you have the opportunity to plant garlic in autumn (usually September–October, 3–4 weeks before frost)?

2. Is your plot ready for autumn planting? (Is it free from preceding crops?).

3. If you cannot plant in autumn or missed the window, is spring planting an option?

Possible solutions:

1. You can plant in autumn:

• Choice: Winter garlic (both hardneck and softneck, depending on climate, see Step 1). Winter garlic produces larger bulbs and an earlier harvest.
• You cannot plant in autumn (or want a late summer/autumn harvest for storage):
• Choice: Spring garlic. Planted in early spring. It doesn't require vernalization and generally stores better than winter garlic, but the bulbs will be smaller.

Step 4. Choose the Subspecies and Cultivar Group

Based on Steps 1–3, you should already have a general idea. Now let's narrow it down.

If your choice is winter hardneck (for cold climates and strong flavor):

• Groups: 'Rocambole' (very aromatic, but short storage), 'Purple Stripe' (good storage, 5–7 months), 'Porcelain' (large cloves, productive).
• Examples (for Russia/Belarus): 'Yubileiny Gribovsky', 'Polet', 'Dungansky Mestny' (Balashev and Zeman, 1981; Autko et al., 2012).

If your choice is winter softneck (for warm climates and long storage):

• Groups: 'Silverskin' (classic, excellent storage, up to a year), 'Artichoke' (productive, medium-pungent).
• Examples (international): 'California Early', 'California Late' (Brewster, 2008; Welbaum, 2015).

If your choice is spring garlic (for spring planting and maximum storage life):

• Groups: Mostly softneck forms.
• Examples: Russian sources mention specific spring cultivar names less frequently; in practice, gardeners often use their own local selections adapted to the region. Look for spring varieties in local nurseries.

Step 5. Choose a Specific Variety Considering Local Conditions and Personal Preferences

At this stage, you should make a "final selection" by studying the offerings from local nurseries and gardening stores.

Pay attention to:

1. Regionalization: Prefer varieties already recommended for your climate zone. This is a key to success.

2. Taste: If you like pungent garlic, choose 'Rocambole' or 'California Late'. If you prefer a milder taste, consider 'Artichoke' or some 'Purple Stripe' varieties.

3. Yield and Size: Check descriptions. For example, 'Porcelain' is known for large bulbs, while 'Silverskin' produces smaller but numerous and dense bulbs.

4. Disease Resistance: Although garlic lacks wide varietal diversity in resistance, some groups (e.g., 'Artichoke') are considered more resistant to Fusarium.

Summary Table for Decision Making

Use this table as a quick reference when choosing.

What If Choosing Is Difficult? (Practical Advice)

If you are a beginner or unsure, start small:

1. Plant 2–3 different varieties in small beds. For example, one hardneck winter (for summer eating) and one softneck winter or spring (for storage).

2. Keep records: Note how each variety overwintered, how it grew, how long it stored, and how it tasted. After one season, you'll know exactly what works best for your plot and your needs.

3. Look for local varieties: They are often best adapted to your region. Ask neighboring gardeners or local gardening communities.

Conclusion and Bridge to the Next Article

Choosing the right variety and growing method is the foundation for your future garlic harvest. Now that you're armed with knowledge of classification and ecological requirements, you can make an informed choice that ensures your garlic will grow, store well, and delight you and your family.

In the upcoming articles in our series, we will delve into each stage of cultivation:

• Preparing the Bed: how to properly prepare the soil and choose a location.
• Planting Garlic: a step-by-step guide for winter and spring garlic.
• Care: watering, fertilizing, weed control.
• Harvesting and Storage: how not to miss the timing and preserve the harvest until spring.

Proceed to the next material—and your garlic will thank you with an excellent harvest!

Key Takeaway: Choosing garlic is always a compromise between winter hardiness, flavor, bulb size, and storage life. Your task as a gardener is to find the balance that best suits your conditions and needs. Use the algorithm in this chapter as your starting point.