Propagation

Late Summer – Early Autumn (August – September)

This is the primary and most common time for propagating strawberries in regions with a temperate climate. By late summer, mother plants have already formed strong runners with rosettes, and the heat subsides, promoting better survival rates (Bianchi, 2018).

• Why it works: After the harvest, in late July – early August, strawberries enter a second wave of active growth. Mother plants direct their energy not towards forming berries, but towards producing vegetative shoots—runners. Young rosettes planted at this time have enough time to root well before frosts and set flower buds, which directly impacts next year's harvest (Kurennoi et al., 1985; Kirtbaya, 2003).
• Who it's for: This timing is ideal for most home gardeners and farmers in temperate zones, as well as for regions with mild and long autumns.

Early Spring Planting (April – early May)

Spring planting is recommended for regions with harsh, low-snow winters where there is a high risk of young, unestablished plants freezing. In this case, seedlings that were dug up in autumn and stored under special conditions (e.g., a refrigerator)—so-called "frigo" plants—are used (Kirtbaya, 2003; Sharma et al., 2019).

• Why it works: "Frigo" plants are dormant rosettes that have been stored over winter at a strictly controlled temperature (around -2°C). This storage suppresses growth and prevents the plants from exhausting themselves. Planted in early spring, they quickly start growing, utilizing stored reserves, and produce a good harvest in the same year (Gambardella et al., 2016).
• Who it's for: Regions with cold winters and for obtaining early harvests. This method is also often used by commercial farms to optimize their production cycle.

Special Cases: Ever-bearing Strawberries and Division

• Ever-bearing (runnerless) varieties: Some varieties (e.g., alpine strawberries) are propagated only by division or seeds. Division is usually carried out in early spring or late summer, when the plant is actively vegetating but not flowering. This is because division is a traumatic procedure, and the plant needs time to recover.
• Seed propagation: This is the most time-consuming method. Seeds are sown in February – March to get strong seedlings ready for planting in open ground by the warm season.

Brief Summary

To avoid confusion, follow this simple rule: for regular, non-ever-bearing varieties, the best time to obtain and plant new plants is late summer – early autumn. If you live in a region with a very harsh winter or plan to get a harvest a year earlier, use early spring planting of healthy, properly stored planting material.

Great, let's continue. The chapter on the simplest and most popular method of propagation.

How to Choose the "Right" Mother Plant

The success of your future harvest directly depends on which bush you take the runners from. The best planting material comes from healthy, vigorous, and high-yielding plants.

• Selecting mother plants: Mark the most productive bushes during the fruiting period. Pay attention to those that produce large, uniform berries, have strong leaves, and show no signs of disease. These bushes will be your "mother plants" (Kirtbaya, 2003; Hill & Perry, 2011).
• First-order runners: Each runner usually forms several rosettes. The strongest and most viable ones are those located closest to the mother plant (first-order rosettes). They receive more nutrition and are better developed. Second- and third-order rosettes are generally weaker and may produce a smaller yield (Bianchi, 2018; Bowling, 2000).
• Removing flower stalks: To ensure the mother plant spends all its energy on producing runners rather than flowers and berries, all flower stalks must be removed as soon as they appear in the year you plan to produce runners. This is an important agronomic technique that ensures abundant rosette formation (Kurennoi et al., 1985).

When and How to Select Runners

The optimal time to start rooting runners is late July – August, when the second growth wave provides maximum energy for vegetative propagation (Bianchi, 2018).

1. Choose a day: It's best to do this work on a cloudy, humid day or early in the morning. This reduces plant stress and prevents roots from drying out.

2. Prepare the site: Prepare a bed or space between rows in advance. The soil should be loose, moist, and fertile.

3. Rooting the rosette in place (without transplanting): The easiest method for a small number of plants is to let the rosette root directly in place, without separating it from the mother plant. To do this, pin the rosette to the moist ground using a wire staple or simply press it down with a small stone. Roots will appear in 7–10 days.

4. Caring for the rooting rosette: Water it and loosen the soil around it. Maintaining moisture is crucial, as young roots dry out quickly (Kirtbaya, 2003).

5. Separation from the mother plant: After the rosette has rooted (usually after 2–3 weeks) and has developed 3–4 true leaves, it can be separated. Cut the runner connecting it to the mother plant, leaving a small "tail" (about 1 cm) on the rosette side (Gambardella et al., 2016).

6. Transplanting: Carefully dig up the rooted rosette with a ball of soil and transplant it to its permanent location.

Useful Tips for Runner Care

• Fertilizing: Mother plants need feeding, especially with nitrogen fertilizers, to stimulate runner growth. But don't overdo it: excess nitrogen makes plants lush and more susceptible to diseases (Bowling, 2000; Cornell Guide, 2003).
• Weed control: Young rosettes are very sensitive to competition from weeds. Regularly weed the area to give young plants a chance to develop well.
• Varietal characteristics: Note that different varieties produce runners differently. Some (e.g., many ever-bearing varieties) produce few runners, making propagation by runners difficult. In such cases, other methods are used (Gambardella et al., 2016; Hill & Perry, 2011).

What to Do with "Second-Order" Runners

If you notice that not only first-order rosettes have formed on the main runner but also side runners (second-order), it's better to remove them. They consume too much nutrition, weakening all the rosettes. Leave only the strongest rosettes closest to the mother plant and cut off the rest (Bianchi, 2018). This will ensure high-quality planting material that will produce an abundant harvest the following year.

When to Use Division

This method is used in two main cases:

1. For runnerless and low-runner varieties: If your favorite variety does not produce runners (e.g., many alpine strawberry varieties) or produces very few, division is the only way to propagate it.

2. For rejuvenating valuable bushes: If you have an old but very tasty or productive bush that has started to produce smaller berries and lower yields, you can divide it. This not only gives you new plants but also rejuvenates the mother plant by removing old, dying parts (Bianchi, 2018).

Best Time for Division

The optimal timing for division is the same as for propagation by runners:

• Late summer (August – early September): This is the primary time, as after fruiting, the plant has time to root and prepare for winter.
• Early spring (April): Bushes can be divided before active growth begins. This method is preferable in regions with harsh winters to avoid risking young divisions (Hill & Perry, 2011).
• Important: Do not divide bushes during flowering and fruiting—this causes too much stress for the plant.

How to Properly Divide a Bush

The division process is quite simple but requires care.

1. Choosing a bush: Select a healthy, well-developed bush that produced a good harvest. The more vigorous the bush, the more strong horns it will have.

2. Preparation: The day before division, water the bush thoroughly. This will make digging easier and reduce root damage.

3. Digging: Carefully dig up the bush, trying not to damage the roots. Shake off excess soil to make the horns visible.

4. Division: Using a sharp, clean knife (or pruners), cut the bush into separate parts. Each part (horn) must have:

• A crown (terminal bud) — the growing point.
• Several healthy roots at least 5–7 cm long.
• 2–3 well-developed leaves (or leaf primordia if dividing in spring).
• Sanitization: If there are damaged or dried parts on the old roots, remove them. Before planting, it is helpful to dip the roots in a clay slurry to prevent them from drying out (Kirtbaya, 2003).
• Planting: Plant each division like a regular seedling—at the same depth it was growing before. The crown must be strictly at soil level, neither buried nor raised (Cornell Guide, 2003).

Care After Division

Divisions need especially careful care after planting, as they have undergone an operation comparable to surgery.

• Watering: Water regularly so the soil around the roots is moist but not waterlogged. Drying out is particularly dangerous for divisions.
• Shading: If the weather is hot and sunny, shade the young plants for a few days using light row cover or simple paper caps. This will help them establish faster.
• Removing flower stalks: In the first year after division, do not allow the plants to flower. All flower stalks must be removed so that all energy goes into developing the root system and leaf mass. This guarantees a good harvest the following year (Hill & Perry, 2011).

Advantages and Disadvantages

Advantages:

• Simplicity of the method.
• Complete preservation of varietal characteristics.
• Ability to propagate runnerless varieties.
• Rejuvenation of old but valuable plants.

Disadvantages:

• Labor-intensive (needs digging and dividing each bush manually).
• Low multiplication rate—you can get only a few divisions from one bush (compared to dozens of runners).
• Lower survival rate compared to rooted runners, as the plant suffers trauma. Requires careful care.

Division is an indispensable method when propagation by runners is impossible. It requires more attention and patience from the gardener but allows for the preservation and propagation of even the rarest and most valuable strawberry varieties.

When and Why to Use Seed Propagation

Despite this, seed propagation has three clear areas of application:

1. For alpine (woodland) strawberry (Fragaria vesca): This is the only case where seed propagation is justified and even recommended for gardeners. In alpine strawberries, varietal characteristics are preserved quite well during seed propagation. Seeds are easy to buy, and they grow into compact, runnerless bushes with aromatic berries (Hill & Perry, 2011; Bowling, 2000). Varieties like 'Alexandria', 'Mignonette', and 'Ruegen' propagate excellently by seed.

2. For breeding and developing new varieties: Breeders use seed propagation to obtain hybrid seedlings with new, improved traits. From thousands of seedlings, only a few are selected, which are then propagated vegetatively to fix the varietal properties (Bianchi, 2018; Kirtbaya, 2003).

3. For rejuvenation and sanitation: Sometimes seed propagation is used to obtain virus-free material, as viruses are rarely transmitted through seeds (Potapov et al., 2000). However, this is not relevant for the home garden.

Specifics of Seed Propagation

Strawberry seeds are among the smallest in horticulture. They require special preparation and very careful care.

• Stratification: Freshly harvested strawberry seeds are in a state of deep dormancy. To "wake" them up, it is necessary to carry out stratification—exposure to low positive temperatures in a moist environment (Trunov et al., 2012; Sharma et al., 2019). In nature, this process occurs naturally over the winter. At home, it is simulated:
• Method 1: Sow the seeds in a container with moist soil, sprinkle a thin layer of sand on top, and place in the refrigerator on the bottom shelf (temperature +2…+5°C) for 3–4 weeks. Periodically spray the surface with a sprayer to prevent it from drying out.
• Method 2: Mix the seeds with moist sand or peat, place in a plastic bag, and keep in the refrigerator for 3–4 weeks (Kirtbaya, 2003).
• Germination: Without stratification, seedlings may only emerge after several months, or more often, not appear at all. After stratification, seedlings emerge uniformly, within 2–3 weeks (Sharma et al., 2019).
• Sowing: Strawberry seeds are sown very early—in late January – February. For this, use shallow containers with loose, moisture-absorbent substrate (a mixture of peat, sand, and garden soil). Seeds are not buried in the soil but scattered on the surface and lightly pressed down (Hill & Perry, 2011). The container is covered with glass or transparent film to create a greenhouse effect.
• Seedling care: After seedlings emerge, the cover is gradually removed, acclimating the seedlings to the air. Watering is done only by spraying with a sprayer to avoid washing away the tiny plants. At the stage of 2–3 true leaves, seedlings are pricked out (transplanted) into individual pots.

Step-by-Step Instructions for the Gardener

1. Seed selection: If you decide to try, buy seeds only of alpine strawberry varieties. For large-fruited varieties, use only purchased seeds from reputable producers, but remember the possible heterogeneity of the harvest.

2. Preparation: Carry out stratification (as described above).

3. Sowing: Fill the container with loose soil, moisten it. Scatter the seeds on the surface, lightly press them into the soil (without covering!). Cover with glass.

4. Waiting: Keep the container in a warm (about +20°C) and bright place, but not in direct sunlight. Ventilate daily.

5. Pricking out: When 2–3 true leaves appear, carefully transplant the seedlings into individual pots or plug trays (1–2 plants per cell). Use the same soil mixture.

6. Hardening and planting out: 2 weeks before planting in open ground (usually in May), start hardening off the seedlings by placing them outside for a few hours. Plant the seedlings in their permanent location after the threat of frost has passed.

Advantages and Disadvantages

Advantages:

• Can get a large number of plants at once.
• The only method for beginner breeders (can obtain new, unusual forms).
• Guaranteed healthy planting material (viruses are not transmitted through seeds).

Disadvantages:

• Varietal characteristics of large-fruited strawberries are not preserved — the most critical drawback for the gardener.
• Labor-intensive, time-consuming process.
• Slow growth of seedlings in the first year.
• Harvest appears only in the second year (unlike vegetative propagation, which yields berries the very next season) (Kurennoi et al., 1985).

Conclusion: For most home gardeners, the seed method is more of an interesting experiment than a practical way to obtain planting material. If you want to preserve a favorite variety, use propagation by runners or division. Leave seeds for alpine strawberries or for breeding experiments.

Why Micropropagation is Used

In commercial fruit growing and nursery production, this method solves three main tasks:

1. Sanitation of planting material: This is the most important application. Strawberries, like many other berry crops, are severely affected by viruses, mycoplasmas, and other latent infections that do not show external symptoms but sharply reduce yields (by 50–90%) (Potapov et al., 2000). The apical meristem is the only part of the plant that often remains free of viruses, as viruses cannot penetrate the rapidly dividing cells of the growing point. By growing a new plant from the meristem, we obtain a completely healthy "zero" clone (Gambardella et al., 2016; Husaini & Neri, 2016).

2. Rapid multiplication of new and rare varieties: When a new promising variety is developed, it needs to be multiplied quickly to supply commercial plantations. Vegetative propagation by runners gives a multiplication rate of about 1:30–50 per season. Micropropagation gives a rate of 1:1000 or more in the same period (Sharma et al., 2019). This allows a new variety to be introduced into production within a few years.

3. Preservation of valuable genotypes: Collections of varieties can be stored in test tubes in a state of "slow growth" (at low temperatures) for years, saving space and eliminating the risk of losing a variety due to diseases or adverse conditions (Gambardella et al., 2016).

How It Happens in Industry

In professional nurseries, the micropropagation process for strawberries looks like this:

1. Selection and sanitation: The best, most productive, and flavorful bushes are selected. The shoot tip (meristem), measuring only 0.2–0.4 mm—thinner than a pinhead—is isolated from them (Gambardella et al., 2016).

2. In vitro culture: The meristem is placed in a test tube on a sterile gel-like substrate containing sugars, mineral salts, vitamins, and growth regulators. After a few weeks, a small plant (the regenerant) grows.

3. Microcutting: This plant is cut into numerous microcuttings and transferred to new media for multiplication. This stage is repeated several times (up to 10–15 passages) until the required number is obtained.

4. Rooting and acclimatization: The obtained micro-shoots are transferred to a rooting medium containing other hormones (auxins). When they develop roots, they are removed from the test tubes, washed of gel, and planted in greenhouses or special nurseries with artificial mist for acclimatization to non-sterile conditions. This is the most critical stage, as plants grown in test tubes are unaccustomed to the normal environment (Gambardella et al., 2016; Sharma et al., 2019).

5. Growing on: After acclimatization, the plants (called "super-super-elite") are planted in the field. Over the next season, they produce numerous runners, which are then used to produce standard seedlings (elite, first reproduction) for gardeners and farmers (Kirtbaya, 2003; Tarasov, 1981).

What This Means for the Gardener

The home gardener will not independently engage in micropropagation—this requires a sterile laboratory, expensive equipment, and specialized knowledge. However, every gardener encounters the results of this method when buying seedlings from a nursery.

Advantages of purchased seedlings obtained in vitro:

• They are completely healthy and free from viral and mycoplasma diseases.
• They have increased growth vigor, produce more runners and higher yields.
• They are genetically pure (the variety retains all declared characteristics).

What the gardener needs to know:

• Seedlings from in vitro are more expensive than ordinary ones, but this is an investment in the health of your garden.
• In the first year after planting such seedlings, it is often recommended to remove not only flower stalks but also runners, so the plant can root well and become strong.
• Some studies have noted that micropropagated plants may show some "instability" in the first years (e.g., producing more runners or slightly changing leaf shape), but these effects disappear by the second or third year (Gambardella et al., 2016; Sharma et al., 2019).

Limitations of the Method

Despite all the advantages, micropropagation also has disadvantages:

• High cost: Laboratory equipment, nutrient media, and qualified personnel make this method expensive.
• Somaclonal variations: Although rare (about 1–3%), sometimes, especially with prolonged cultivation (more than 15–20 passages), plants with altered traits may appear. Professional nurseries control this by limiting the number of passages (Gambardella et al., 2016; Sharma et al., 2019).
• Acclimatization difficulty: The transition from a sterile test tube to a normal environment is stressful for the plant, and some plants may die during the acclimatization stage.

Conclusion for the Reader

Micropropagation is the foundation of modern commercial nursery production. Thanks to it, you can buy high-quality, sanitized seedlings of a guaranteed variety that will give the best yield. For home use, this method is too complex and costly, so it's better to use runners or division for personal propagation. However, knowing about the existence of this technology will help you understand the choice of planting material in the nursery and properly care for purchased plants in the first year.

Why This Is So Important

The strawberries we grow in our gardens are complex hybrids created by breeders through multiple crosses. Their genetic code is a unique combination of traits that is stably reproduced only through vegetative propagation.

• Vegetative propagation (by runners and division): The new plant is an exact genetic copy (clone) of the mother plant. It inherits all the varietal properties: large fruit size, sweetness, color, ripening time. This is like making a photocopy of a document—all details are preserved (Kurennoi et al., 1985; Trunov et al., 2012).
• Seed propagation: With seed propagation, a sexual process occurs—the combination of genetic material from two parents. The resulting offspring is not a copy but a new, unique organism. It will have traits from both parents, but in the most unpredictable combinations. Berries may become smaller, more acidic, change shape, and yields may decrease. This is like shuffling two decks of cards and dealing them anew—each time a new combination appears (Sharma et al., 2019).

How to Properly Select Mother Plants to Preserve the Variety

To preserve a variety, you need to be very responsible in choosing the bushes from which you will take runners or which you plan to divide.

1. Choose only the best bushes: Mark the most productive, healthy, and large-fruited bushes during fruiting. Use stakes or ribbons so you don't lose sight of them after the berries are harvested (Bianchi, 2018).

2. Observe throughout the season: Evaluate not only the berries but also the overall condition of the plant. It should have a powerful leaf rosette, be resistant to diseases, and produce many runners. A weak, diseased, or degenerating plant will not produce quality offspring (Kirtbaya, 2003).

3. Use only first-order rosettes: As mentioned in the chapter on propagation by runners, to preserve varietal vigor, it is best to take rosettes located closest to the mother plant. They are the strongest and most developed (Bianchi, 2018; Bowling, 2000).

Clonal Selection — A Professional Approach

In commercial fruit growing, the method of clonal selection is used to maintain a variety in its pure form (Kirtbaya, 2003; Kurennoi et al., 1985). Although this may seem excessive for the home garden, understanding this principle will help you become a more skilled gardener.

Clonal selection is the annual culling of plants that, for some reason, have lost varietal traits or weakened. Even within the same variety, individual bushes can over time become smaller, get sick, or produce less tasty berries.

• Mass selection: Every year, during fruiting, you visually evaluate all the bushes in the bed. Those that seem best to you are marked and used for propagation. Weak, diseased, or low-yielding bushes are culled (removed).
• Individual selection: A more thorough approach. You don't just visually assess the bush but also weigh the berries and count their number. The best bushes are used as mother plants, and their offspring are grown separately, assigning them a clone number. If over 2–3 years this clone shows consistently high results, it can be used for mass propagation (Kirtbaya, 2003).

Simple Rules for the Gardener

1. Propagate only the best bushes. If you notice a bush in the bed that always produces the largest and sweetest berries, use only its runners to renew the plantation.

2. Do not take runners from diseased or weakened bushes. Even if the variety is valuable, a diseased plant will pass on its weakness or predisposition to diseases to its offspring.

3. Regularly update varieties. Even with the most careful selection, viruses can accumulate in planting material over time (especially when propagating by runners for many years). Therefore, every 3–5 years, it is useful to renew the variety by buying elite, sanitized seedlings from a nursery (especially micropropagated ones) (Hill & Perry, 2011; Husaini & Neri, 2016).

4. Do not take runners from first-year plants. Allow the plant to root well and become strong first. In the second year after planting, it will show its true varietal qualities.

Brief Summary

Preserving a variety is a continuous work of selecting the best plants. The main rule is to use only vegetative methods (runners and division) for propagation, and for obtaining runners, only the best, healthiest, and most productive bushes. Remember: the variety's genetics are its main wealth, and the gardener's task is to carefully pass this wealth on to new generations of plants.

Main Threats to Seedling Health

Before discussing methods for obtaining healthy seedlings, it is important to understand what exactly we are protecting them from. The main "enemies" of strawberry planting material (Husaini & Neri, 2016; Bowling, 2000):

1. Viruses and mycoplasmas: These are the most insidious infections. They do not always cause obvious symptoms, but they gradually weaken the plant, reduce yields (sometimes by 50–90%), impair berry flavor, and shorten the plantation's lifespan. Viruses are transmitted through vegetative propagation (runners) and carried by insect vectors (aphids, leafhoppers) (Potapov et al., 2000; Trunov et al., 2012).

2. Fungal diseases: Gray mold (botrytis), anthracnose, verticillium wilt, phytophthora root rot—these diseases can affect all parts of the plant, including runners and young rosettes. They spread through infected plant material, soil, and water droplets (Bianchi, 2018; Cornell Guide, 2003).

3. Nematodes and mites: Strawberry nematode, stem nematode, and strawberry mite are microscopic pests that are difficult to see with the naked eye. They feed on plant sap, weaken them, and can transmit viruses. Infected bushes lag in growth, leaves become deformed, and berries become smaller (Kirtbaya, 2003; Tarasov, 1981).

Selecting Healthy Mother Plants

The first and most important step is selecting the initial plants for propagation.

• Observe during fruiting: Choose only those bushes that produced the most abundant harvest of large, beautiful, and tasty berries. Mark them with stakes or ribbons (Bianchi, 2018; Hill & Perry, 2011).
• Assess appearance: A healthy plant should have uniform, dark green leaf color without spots, yellowing, or deformations. The bush should be vigorous, well-leafed, with many runners. Any signs of depression, chlorosis, spotting, or curling are reasons for culling (Kurennoi et al., 1985).
• Exclude diseased bushes: If you notice even one plant on the plantation with signs of a viral disease (mottling, mosaic, leaf wrinkling, dwarfism), immediately remove it with roots and burn it. Never take runners from such bushes (Potapov et al., 2000).
• Spatial isolation: If possible, create a separate "mother bed," located at least 1–2 meters away from the main fruiting plantations. This reduces the risk of cross-contamination (Gambardella et al., 2016; Kirtbaya, 2003).

Preventive Measures in the Mother Bed

To obtain healthy runners, mother plants need special care.

• Removing flower stalks: In the mother year, do not allow the bushes to flower—remove all flower stalks as soon as they appear. This redirects the plant's energy to producing strong, healthy runners (Kurennoi et al., 1985; Hill & Perry, 2011).
• Regular treatments: Carry out preventive spraying of mother plants against fungal diseases and pests. Use approved fungicides (e.g., Bordeaux mixture) and insecticides (e.g., Fitoverm) according to instructions, observing the waiting periods before collecting runners (Krivko, 2014; Kirtbaya, 2003). Important: Do not use chemicals during the period when runners are rooting—this can damage young roots.
• Weed removal: Weeds are reservoirs for pests and diseases, as well as competitors for moisture and nutrients. Keep the mother bed in perfect cleanliness (Cornell Guide, 2003).
• Fertilizing: Provide mother plants with balanced nutrition, especially nitrogen—it stimulates runner formation. However, do not overdo it: excess nitrogen makes tissues loose and more susceptible to fungal infections (Bowling, 2000; Hill & Perry, 2011).

Thermotherapy — A Disinfection Method

In professional nurseries, thermotherapy—heating plants in hot water—is used to rid planting material of viruses, nematodes, and mites (Kirtbaya, 2003; Potapov et al., 2000). This method is sometimes also used by enthusiast gardeners.

How it works: Exposure to elevated temperatures (but not critical for the plant itself) inactivates viruses and kills nematodes and mites while preserving the plant's viability.

For the home gardener (simplest version):

• Before planting, the roots and lower part of the rosette can be immersed in hot water (48°C) for 15 minutes or (52°C) for 5–7 minutes (Kirtbaya, 2003).
• Important: Precise adherence to temperature and time is critical—overheating will kill the plant, underheating will be ineffective. For home use, this method requires a thermometer and practice.
• After heating, plants are immediately cooled in cold water (about 15–20°C) and planted (Gambardella et al., 2016).
• Warning: This technique is only suitable for healthy but potentially infected plants. It will not help if the plant is already severely weakened by diseases.

Signs of Quality Seedlings

When you dig up or buy ready-made seedlings, pay attention to the following criteria (Tarasov, 1981; Kirtbaya, 2003; Trunov et al., 2012):

• Root system: Should be well-developed, light-colored, fibrous, with many fine absorbing roots. Root length should be at least 5–7 cm (for first-grade plants). Roots should have no dark spots, rot, or swellings (signs of nematodes).
• Rosette (above-ground part): Strong, compact, should have at least 3–4 well-developed dark green leaves. Leaves should be free from spots, damage, and deformations.
• Crown (terminal bud): The main indicator of quality. The crown should be healthy, undamaged, with a bright green color. If the crown is brown or dark—the plant is diseased or dead.
• Horn thickness: For high-quality seedlings, the diameter of the root collar (the thickest part at the junction of root and stem) should be at least 8–10 mm (for first-grade). Larger plants (15–18 mm) produce yields much faster and more abundantly (Kirtbaya, 2003; Sharma et al., 2019).
• Absence of disease signs: Leaves, stems, and roots should have no spots, rot, growths, or traces of mold.

Classification of Seedlings by Standard

In professional nurseries, strawberry seedlings are divided into commercial grades (classes). It is useful for the home gardener to know these criteria to avoid overpaying for poor-quality material (Tarasov, 1981; Gambardella et al., 2016):

• First-grade seedlings (or "Extra", "A+" class): Root collar diameter over 10–12 mm, roots at least 7–10 cm, 3–5 healthy leaves. Such seedlings establish quickly, show vigorous growth, and produce high yields in the first fruiting year.
• Second-grade seedlings ("A"): Root collar diameter 8–10 mm, roots 5–7 cm, 2–3 leaves. This is an acceptable but less productive option. Requires more careful care in the first year.
• Third-grade seedlings ("B", cull): Small, weak, with short roots and few leaves. Such seedlings are not recommended—they establish slowly, produce few runners, and low yields.

Storage and Transportation of Seedlings

Special attention should be paid to storage, especially if you buy or dig up seedlings in autumn for spring planting ("frigo" type plants) (Kirtbaya, 2003; Sharma et al., 2019).

• Preparation for storage: Seedlings are dug up in late autumn, when the plants have entered dormancy (after hardening). Leaves are cut off, leaving 1–2 of the youngest leaflets or none at all, and roots are cleaned of soil.
• Storage conditions: Seedlings are placed in moist sand or peat in plastic bags and stored at a temperature of -1…-2°C (below zero, but not freezing!) and a relative humidity of 80–90% (Tarasov, 1981; Kirtbaya, 2003). Under such conditions, plants can be stored until spring (5–6 months) without losing viability.
• Transportation: If you need to transport seedlings over a long distance, the roots must be dipped in a clay slurry (a mixture of clay, water, and manure) and tightly wrapped in a damp cloth or polyethylene to prevent them from drying out (Trunov et al., 2012). Avoid overheating and prolonged exposure to the sun.

Brief Recommendations for the Gardener

1. Buy seedlings only from reputable nurseries with a good reputation. Look for certified, sanitized (micropropagated) material.

2. When propagating yourself, carefully select only the best, outwardly healthy bushes and create a separate mother bed.

3. Always inspect roots and the crown before planting. Discard plants with dark, damaged roots and a brown crown.

4. Do not take seedlings from other, unknown plantations—this risks introducing viruses and pests to your site.

5. Store seedlings correctly, and they will reward you with an excellent harvest. The health of the seedlings is the health of your garden for years to come.

1. Incorrect Timing for Propagation

Mistake: Propagating strawberries at the wrong time—too late in autumn, when young plants do not have time to root before frost, or in the middle of summer heat, when survival rates drop sharply.

Why it's a mistake: Young rosettes need moist, cool weather for successful rooting. When planted in heat, roots dry out, the plant spends too much energy evaporating water through leaves, and it may die. With late autumn planting, the root system does not have time to develop before the soil freezes, and the plant freezes in winter (Bianchi, 2018; Kirtbaya, 2003).

How to avoid: For most regions, the optimal time is late summer – early autumn (August–September), when the heat subsides. In regions with harsh winters, spring planting (April–May) using properly stored "frigo" seedlings is preferable (Kurennoi et al., 1985; Tarasov, 1981).

2. Using Weak and Diseased Mother Plants

Mistake: Using any available runners for propagation, without selection, including from weakened, diseased, or low-yielding bushes.

Why it's a mistake: A diseased plant passes on its "poor" condition to its offspring—viruses, fungal infections, weakness. In addition, a weak bush is not capable of producing full, vigorous runners suitable for obtaining large-fruited seedlings (Bianchi, 2018; Bowling, 2000).

How to avoid: Carefully select mother plants. Mark the best, most productive bushes during fruiting (use stakes, ribbons). Take runners only from these bushes, and only of the first order—the strongest rosettes located closest to the mother plant (Husaini & Neri, 2016; Kirtbaya, 2003).

3. Incorrect Planting Depth (Burying the Crown)

Mistake: When transplanting a rooted rosette or division, burying the terminal bud ("crown") in the soil or, conversely, planting too shallowly, leaving roots on the surface.

Why it's a mistake: The crown is the plant's growing point. If it is covered with soil, it may rot or die from lack of light and air. If the crown is raised above the soil, roots dry out, and the plant may die from lack of moisture (Cornell Guide, 2003; Hill & Perry, 2011).

How to avoid: Strictly adhere to the correct depth: the crown should be at soil level, neither buried nor raised (Kurennoi et al., 1985; Trunov et al., 2012). When planting, carefully spread the roots, cover with soil, and firm it down. A properly planted plant can be gently pulled by a leaf—it should not pull out of the ground (Kirtbaya, 2003).

4. Improper Watering of Young Plants

Mistake: Insufficient watering or, conversely, overwatering after planting. Often gardeners either forget to water young rosettes or overwater them, creating conditions for root rot.

Why it's a mistake: Young plants have a weak root system and cannot extract water from deep soil layers. Drying out is deadly for them. On the other hand, excessive moisture combined with cool weather provokes the development of fungal diseases, especially root rots (Bowling, 2000; Cornell Guide, 2003).

How to avoid: Water moderately but regularly, especially in the first 2–3 weeks after planting. The soil should be moist but not waterlogged. It is better to water less frequently but deeply, so water penetrates to the roots, rather than often and shallowly (Bianchi, 2018). Use drip irrigation or water at the base, avoiding getting water on the leaves, especially in the evening (Hill & Perry, 2011).

5. Ignoring Mulching

Mistake: Refusing to mulch the soil after planting young rosettes.

Why it's a mistake: Mulch (peat, compost, straw, mowed grass) performs several important functions: retains soil moisture, prevents roots from overheating in heat, inhibits weed growth, and, most importantly, protects berries from rot as they do not touch the ground (Kirtbaya, 2003; Bianchi, 2018).

How to avoid: After planting and watering, be sure to mulch the soil around the plants with a 2–3 cm layer of organic material (peat, compost, straw). Mulch also prevents the formation of a crust on the soil surface (Trunov et al., 2012).

6. Using Old Bushes for Propagation (Variety Degeneration)

Mistake: Using too old bushes for propagation (obtaining runners) that are already showing reduced yields.

Why it's a mistake: Strawberry is a perennial, but its productive period is usually limited to 3–4 years. Old bushes accumulate viruses, have reduced growth vigor, and poorer berry quality. Runners obtained from such bushes will be weakened and will not produce a good harvest (Hill & Perry, 2011; Bowling, 2000).

How to avoid: For propagation, use bushes no older than 2–3 years. It is at this age that they are most productive and produce the highest quality planting material (Kurennoi et al., 1985). Renew the plantation every 3–4 years using seedlings from healthy young mother beds (Trunov et al., 2012). Remember that even with proper care, the plantation begins to age from the third year of fruiting (Bianchi, 2018).

7. Incorrect Storage of Seedlings (Especially "Frigo" Type)

Mistake: Violating the temperature regime during storage of dug-up seedlings: too high temperature, insufficient humidity, root damage.

Why it's a mistake: Seedlings intended for storage ("frigo") are in a dormant state. Any temperature increase above 0…+2°C can bring them out of dormancy, causing them to start consuming nutrient reserves, weakening the plant before planting. Root desiccation also leads to death (Kirtbaya, 2003; Tarasov, 1981).

How to avoid: Store seedlings at a strictly defined temperature (-1…-2°C) and high humidity (80–90%). Use a refrigerator or a cool cellar for this. Roots should be in moist sand or peat. Before planting, inspect the roots—they should be alive, light-colored, with no signs of rot.

8. Planting Too Close Together

Mistake: Planting rooted runners or divisions too densely in hopes of getting more plants.

Why it's a mistake: Dense plantings lead to competition for light, water, and nutrition. Plants stretch out, weaken, berries become smaller, and the risk of diseases, especially gray mold, increases sharply due to poor ventilation (Bowling, 2000; Cornell Guide, 2003).

How to avoid: Follow recommended planting schemes. For mother plants, the distance between rows is 80–90 cm, and between plants in a row is 30–40 cm. For ordinary plantations in a matted row system, plants are planted at a distance of 15–25 cm from each other (Bianchi, 2018). Young rosettes rooted in the row middles will eventually fill the space themselves; the main thing is not to let them become too dense (Hill & Perry, 2011).

Brief Summary

Propagating strawberries is a simple but responsible process. By avoiding the mistakes listed above, you will be able to obtain high-quality planting material that will delight you with an abundant harvest of large, sweet berries for several years. The main thing is attention to detail and knowledge of the basic principles of agronomy.