Growing for greens

What is the biological logic behind this method?

The secret lies in the physiology of the bulb. It is a modified underground shoot, in whose scales water, sugars, and other nutrients are accumulated (Nonnecke, 1989). Inside the bulb, in the axils of the fleshy scales, the primordia of future leaves and flower stalks are already present (Swiader, 1992). When we plant the bulb in a favorable environment, these dormant buds awaken.

In the initial growth stage, the feather develops exclusively at the expense of the mother bulb's nutrients. The root system of onions is fibrous and weak, especially at the beginning of growth, so it cannot supply the rapidly growing leaves with everything they need from the soil (Brewster, 2008). That is why we use large planting material for forcing greens—the larger the bulb, the more reserve substances it contains, and the higher the yield and quality of the feather will be.

Thus, the technology of growing for feathers is, essentially, a process of "forcing," where we make the plant expend its own resources on rapid green growth. Our task is to create ideal conditions for this (temperature, humidity, light) and not let the plant switch to forming a new bulb or flower stalk. If we water and fertilize onions for feathers the same way we do for bulbs, we may get watery, tasteless greens or force the plant to put all its energy into forming a new bulb rather than growing leaves. This is the main practical difference between the two methods.

In the following chapters, we will thoroughly examine how to correctly choose onions, prepare them for planting, and create ideal conditions to obtain the maximum yield of succulent and nutritious feathers.

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Excellent, let's continue our article. Here is the second chapter, which thoroughly and practically answers the question of choosing planting material.

Types of planting material

1. Selection onion (onion-selection): These are small bulbs obtained during thinning or harvesting of the bulb crop. Their diameter is usually 1.5–3 cm (Pantielev, 1986). This is one of the best options for forcing greens in open ground and greenhouses. Selection onions have a large supply of nutrients and, as a rule, contain several primordia, which ensures a good bunch of feathers.

2. Small and medium sets (1–2 cm in diameter): This material is more often used for growing bulbs, but it is also suitable for greens, especially if larger selection is not available. However, the yield will be more modest, as the nutrient reserves in a small bulb are less. Additionally, small sets are typically single-primordium, yielding only one or two feathers (Swiader, 1992).

3. Large sets and marketable bulbs (3–5 cm in diameter and larger): The most productive option, especially for greenhouses. The larger the bulb, the more reserve substances it has and the more powerful the feather will be (Pantielev, 1986). However, there is an important nuance here: for forcing greens, it is better to use pungent and semi-pungent multi-primordium varieties. Sweet salad varieties (e.g., 'Exhibition') have a loose structure, fewer primordia, and store worse, making them less suitable for this purpose (Nonnecke, 1989; Rubatzky and Yamaguchi, 1997).

4. Multi-primordium varieties: This is a special type that can be singled out as a separate category. In such varieties (e.g., 'Bessonovsky Local', 'Arzamassky Local', 'Rostovsky Onion'), several primordia are laid down in one bulb, from which 3–5 or more leaves form upon germination. Choosing such varieties guarantees obtaining a powerful "bush" of greens from one bulb. These are most often recommended for industrial forcing (Brewster, 2008; Pantielev, 1986).

Which size is better?

In the book "Seasonal Work in Vegetable Growing" (Pantielev, 1986), practical norms for open ground are given: with the so-called "semi-bridge" planting, where bulbs are planted with a small gap, the consumption of selection onions is 3–6 kg per 1 sq. m, depending on its size. For "bridge" planting (tightly next to each other), consumption can reach 8–12 kg/sq. m.

For greenhouse operations, where space saving and maximum return are important, larger bulbs are preferable, as they give a higher absolute yield of feathers (Pantielev, 1986). This is because the ratio of the basal plate area (where roots form) to bulb mass is more favorable in large specimens than in small ones.

Thus, the main rule for choosing planting material for greens is:

1. Look for multi-primordium, pungent, and semi-pungent varieties. They will give you more feathers per bulb.

2. Choose bulbs 3 to 5 cm in diameter. This is the optimal balance between productivity and economic feasibility. If such a caliber is unavailable, use selection onions (1.5–3 cm).

In the next chapter, we will discuss how to properly prepare these bulbs for planting to awaken the buds and protect the future harvest from diseases.

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1. Sorting and grading (mandatory stage)

Before planting, the onions must be sorted. All bulbs with signs of rot, mechanical damage, softness, or unnatural sprouting (e.g., with mold) are discarded. Then, the onions are sorted by size. This allows bulbs of the same caliber to be planted together, ensuring uniform emergence and simplifying care. For forcing feathers, bulbs with a diameter of 3–5 cm are selected. Smaller ones will produce fewer feathers, while too large ones may be economically unviable, although they will yield an excellent harvest (Pantielev, 1986).

Why is this important? Uniform bulb size ensures the same germination rate and allows for efficient planting area planning. Discarding diseased specimens prevents the spread of infections (e.g., white rot or fusarium) in the planting (Swiader, 1992).

2. Warming up (mandatory for onions stored at low temperatures)

Onions stored at temperatures of +1...+5 °C to prevent premature sprouting need to be awakened. 2–3 weeks before planting, the storage temperature is raised to +18...+25 °C. Warming accelerates metabolic processes in the bulb, activates growth buds, and shortens the time until emergence (Swiader, 1992).

Why is this done? If you plant cold onions, they will take a long time to "get going." Warming mimics the arrival of spring and is a powerful signal to start growing. This stage is especially important for autumn-winter plantings in greenhouses or on windowsills (Pantielev, 1986).

3. Trimming the top ("neck") (recommended stage)

This is one of the most effective agronomic techniques. Using a sharp, clean knife, the dry top of the bulb is cut off by about 1–1.5 cm, capturing part of the fleshy scales. It is important not to damage the basal plate and the central bud, from which the main feather will grow (Nonnecke, 1989).

Why it works:

• Improves oxygen access to the growth points, awakening additional buds.
• Makes feather emergence easier, freeing it from the need to pierce dense dry husks.
• Allows visual assessment of bulb quality in cross-section: visible signs of rot or damage.

Important! When trimming, it is necessary to use a disinfected tool (e.g., wipe the knife with alcohol between bulbs) to avoid transferring infection. We consider this step "recommended" because it can be skipped if planting very small sets or if the risk of damaging the central bud is high. However, for large selection bulbs and marketable onions, this is one of the most effective ways to accelerate and increase the yield.

4. Soaking (recommended stage)

There are several soaking options:

• In warm water (+30...+35 °C) for 12–24 hours. This saturates the bulb with moisture, initiating germination processes and activating enzymes.
• In a weak solution of potassium permanganate or other growth stimulants (according to instructions). This additionally disinfects and stimulates the plant's immunity.

Why? Unlike planting for bulbs, where we want the roots to actively seek moisture in the soil, when forcing feathers, we want the process to start as quickly as possible. Soaked bulbs start growing faster and produce an earlier cut (Pantielev, 1986).

Important note for open ground: During early spring plantings in cold and wet soil, soaking may, on the contrary, slow down growth due to stress. Therefore, in open ground in spring, onions are often planted dry, while in warm conditions (greenhouse, windowsill), soaking always gives a positive effect (Brewster, 2008).

5. Disinfection (mandatory before planting in any conditions)

This is the final, critically important stage. Before planting, bulbs must be treated to prevent fungal and bacterial diseases (especially fusarium, neck rot, and bacterial rot). For this, use:

• Fungicidal preparations (e.g., "Maxim," "Fitosporin-M," triazole-based products) strictly according to instructions.
• Potassium permanganate solution (1% bright pink solution) for 20–30 minutes.
• Heat treatment – heating in water at +45...+50 °C for 15–20 minutes. This effectively destroys mites and pathogens but requires precise temperature control (Pantielev, 1986; Swiader, 1992).

Why is this important? Onions are a crop very susceptible to rot. Any damage during trimming or planting is an "entry point" for infection. Disinfection is insurance that will preserve your harvest, especially if you are growing onions in dense plantings (bridge method), where diseases spread at lightning speed.

Summary scale for preparing bulbs for planting:

By following these simple but important steps, you will not only speed up the harvest but also lay the foundation for healthy feather growth. In the next chapter, we will discuss when and in what conditions (open ground, greenhouse, windowsill) it is best to plant the prepared onions for a year-round green conveyor.

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Open ground

In open ground, growing green onions is limited to the warm season, but with different planting dates, it can be extended.

• Early spring planting (late April – early May): This is the main period for most regions. As soon as the soil warms up to +5...+8 °C and the threat of severe frosts has passed, onions can be planted. Timing depends on the region: in central Russia, this is late April – the first ten days of May; in more southern regions, 2–3 weeks earlier. To protect against return frosts, the beds can be covered with non-woven material (Pantielev, 1986; Swiader, 1992).

Why is this important? Onions are a cold-hardy crop. Early planting allows using the spring soil moisture reserve for rapid rooting, and the cool weather promotes the formation of succulent and tender feathers without bolting (Nonnecke, 1989).

• Summer planting (June – July): This is an excellent way to get a second wave of greens in late summer or early autumn. Summer plantings also allow using areas freed up after harvesting early crops (radishes, lettuce, early cabbage). Onions are planted in the same way as in spring, but in hot weather, the plantings are necessarily watered and shaded for better establishment.

• Autumn (winter) planting (late September – October): In regions with mild winters, winter planting is practiced. Onions are planted 2–3 weeks before the onset of stable frosts, so they have time to root but do not start active growth (Swiader, 1992; Pantielev, 1986). For the winter, beds are mulched with a layer of humus, peat, or sawdust (layer 5–10 cm) to protect against freezing. Greens from winter planting are obtained 2–3 weeks earlier than from spring planting (Pantielev, 1986).

Important rule: For winter planting, only frost-resistant varieties are chosen, and small sets or selection onions (1–2 cm in diameter) are used. Large bulbs are more likely to freeze or bolt in spring (Brewster, 2008).

Protected ground (greenhouses and hotbeds)

Greenhouses allow you to control the microclimate and get greens even in the cold season.

Forcing from January to March: In heated greenhouses and hotbeds on biofuel (horse manure), planting can begin as early as January-February. For successful forcing in short-day conditions, the following are critically important:

• Light: During this period, supplementary lighting with lamps (grow lights) is mandatory to extend the photoperiod to 12–14 hours.
• Temperature: Optimal regime: daytime +18...+22 °C, nighttime +10...+14 °C (Pantielev, 1986; Swiader, 1992).
• Quality planting material: Only large, well-ripened selection onions or marketable bulbs are used.

Forcing in spring and summer greenhouses (March – August): In unheated greenhouses with film or glass covering, several plantings can be carried out. Thanks to natural heat and light, forcing is faster, and heating savings make this method profitable.

Growing on a windowsill

The simplest and most accessible way to get greens at any time of the year.

• Year-round growing: On a windowsill, onions can be planted all year round. The main condition is sufficient lighting (south-facing window) or the use of grow lights in autumn-winter. The room temperature should not exceed +22...+25 °C, otherwise the feather becomes pale and limp. The ideal temperature for indoor forcing is +18...+20 °C.

Key rules for any growing method

1. Do not plant onions in unheated or waterlogged soil. This provokes rot and delays growth.

2. Monitor the light regime. With insufficient light, the feather stretches, becomes pale and brittle. In cloudy weather and winter, supplementary lighting is mandatory.

3. Plan crop rotation. Do not plant onions in the same place for two years in a row to avoid the accumulation of diseases in the soil (Swiader, 1992).

The main conclusion: there is no single planting date. You build your own schedule by choosing the growing method and adapting it to your climate. In the next chapter, we will discuss how exactly to plant onions, which schemes and planting depths to use to get maximum return from each bulb.

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Planting schemes

1. Bridge method (most intensive)

Bulbs are planted as densely as possible, literally like a "bridge" – tightly next to each other. Gaps between them are minimal or absent. This method is the gold standard for greenhouse operations and for those who want to get maximum greens from a minimum area (Pantielev, 1986).

Advantages:

• Maximum green yield per 1 sq. m: Due to ultra-dense planting, you get the largest yield of feathers per unit area.
• Ideal for limited space: Greenhouses, hotbeds, boxes on a windowsill.
• Simplifies care: Plantings occupy the entire area, facilitating watering and reducing weed growth.

Disadvantages:

• High consumption of planting material: 1 sq. m requires 8 to 12 kg of bulbs (Pantielev, 1986).
• Increased risk of diseases: Planting density creates favorable conditions for the spread of rot, therefore requiring particularly thorough pre-planting treatment and good ventilation.
• Labor-intensive: Requires more time for planting and selecting bulbs.

2. Semi-bridge method (compromise option)

Bulbs are planted with a small gap – about the width of a match or 1–2 cm apart. This is the golden mean, most commonly used in amateur vegetable growing and small-scale farming.

Advantages:

• Saving planting material: Consumption decreases to 3–6 kg/sq. m (Pantielev, 1986).
• Larger feathers: Bulbs get a little more space, which often leads to the formation of more powerful and succulent feathers.
• Good ventilation: Gaps between bulbs reduce the risk of fungal diseases.

Disadvantages:

• Slightly lower yield per unit area compared to the bridge method.

3. Row method (classic)

Bulbs are planted in furrows or rows with a certain spacing. This is the most "spread out" method, used mainly in open ground when space allows, or when onions are planted as a compactor (Pantielev, 1986).

Scheme: Rows with row spacing of 20–45 cm. The distance between bulbs in a row can vary from 3–5 cm (for obtaining greens for cutting) to 10–15 cm (if you plan to leave some plants to produce bulbs).

Advantages:

• Minimal consumption of planting material.
• Ease of care: Easier to carry out inter-row cultivation and weed control.
• Versatility: Allows, if necessary, to leave some plants to produce marketable bulbs.

Disadvantages:

• Lowest green yield per unit area.
• Later harvest compared to dense plantings.

Planting depth

This is one of the most important points, often overlooked. When growing onions for feathers, the bulb is not fully buried. It is planted so that the upper part (shoulders) slightly protrudes from the soil.

Optimal planting depth:

• In open ground: To 2/3 of the bulb's height. This means the bulb should be immersed in the soil to about 2/3 of its height, while the upper third should remain above the surface (Pantielev, 1986; Nonnecke, 1989).
• In a greenhouse or on a windowsill: The bulb is buried to 1/2–2/3 of its height. This ensures stability and moisture access to the root system but does not hinder rapid feather growth.

Why is this important?

1. Rapid feather emergence: With shallow planting, the bulb "wakes up" faster, and the feather breaks out more easily. With deep planting, the onion spends energy overcoming soil resistance.

2. Prevention of rots: Planting "up to the shoulders" allows the lower part of the bulb to remain dry and well-ventilated, reducing the risk of neck and bacterial rot.

3. Free root development: The onion root system develops in the upper soil layer, where there is more air. Deep planting restricts its development and can lead to root rot.

Practical tip: If you use the bridge method, try to plant the bulbs so that their tops are at the same level. This will ensure uniform feather regrowth and facilitate cutting.

In the next chapter, we will create a "recipe for ideal conditions" – analyzing what temperature, light, and humidity onions need for rapid and healthy growth.

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1. Temperature: controlling growth rate

Temperature is the main lever determining the speed of feather emergence and growth.

Optimal temperature regime:

• For germination and initial growth: During the rooting and sprouting period, the optimal temperature is +18...+22 °C during the day and +10...+14 °C at night (Pantielev, 1986). Such a difference between day and night temperatures (thermoperiodism) stimulates active root growth and prevents excessive feather elongation.
• For active feather growth: When the feather reaches a height of 5–10 cm, the temperature can be raised to +20...+25 °C during the day. This will accelerate the accumulation of green mass. However, it is important not to overheat: at temperatures above +30 °C, growth slows down, and the feather becomes limp and pale (Swiader, 1992).

Why is the nighttime drop important? During cool nights, respiration slows down, and the bulb spends fewer accumulated sugars. This allows maximum energy to be directed to leaf growth rather than maintaining the bulb's vital functions (Rubatzky and Yamaguchi, 1997).

Critical values:

• Below +8 °C, growth almost stops, although the onion does not die (Nonnecke, 1989).
• Above +28...+30 °C without good ventilation and watering, the feather begins to turn yellow and dry.

Practical conclusion: In a greenhouse or on a windowsill, try to keep the nighttime temperature 5–8 °C lower than the daytime temperature. This is one of the secrets to juicy and dense feathers.

2. Light: a vital resource, especially in winter

Light is the energy that triggers the process of photosynthesis. Unlike growing for bulbs, where the day can be short, greens require sufficient lighting.

Light requirements: For active feather growth, a photoperiod of at least 12 hours is needed. Ideally – 14–16 hours (Brewster, 2008). With a short day (autumn, winter), the onion spends bulb reserves on respiration, and photosynthesis proceeds weakly, so the feather turns out pale and elongated.

Supplementary lighting: In cloudy weather and during winter months, supplementary lighting with grow lights or daylight lamps (cool spectrum) is mandatory. In greenhouse operations, sodium or LED lamps are used for this. The power is selected to provide illumination of about 100–120 W/sq. m (Pantielev, 1986). On a windowsill, it is enough to hang a lamp at a height of 20–30 cm above the plants.

Supplementary lighting regime: Lamps are turned on in the morning and evening to extend the photoperiod to 14–16 hours. In the dark, plants need rest (a dark period of at least 6–8 hours).

Why is this important? With insufficient light, the feather becomes thin, pale, brittle, and loses its marketable appearance. Additionally, the bulb depletes faster, and the yield decreases (Swiader, 1992).

3. Air and soil humidity: balance, not excess

Onions for feathers require moisture, but their roots are very sensitive to overwatering.

Air humidity: Optimal relative air humidity during the active growth period is 60–70%. At higher humidity, the risk of fungal diseases (e.g., neck rot and downy mildew) increases. In dry air (less than 50%), the feather begins to dry from the tips and becomes coarse (Pantielev, 1986).

Soil humidity: The soil should be constantly moist, but not wet. Water so that the water penetrates the root zone (10–15 cm) but does not stagnate in the tray or between bulbs. Usually, watering is done every 2–3 days, and in hot weather – daily, but in small doses (Brewster, 2008).

Important note: Unlike growing for bulbs, where we strive for complete drying of the soil between waterings, for greens the soil should be constantly moist. However, if the air temperature is low (+12...+15 °C) at the same time, excess water can provoke root rot. Therefore, watering is always linked to temperature: the warmer, the more frequent and abundant the watering, and vice versa.

4. Ventilation: fresh air against diseases

Ventilation is an often underestimated but critically important factor, especially in greenhouses and hotbeds.

Why ventilation is needed:

• Removal of excess moisture: After watering and at high temperatures, the air becomes humid. This is an ideal environment for the development of diseases (gray mold, neck rot).
• Temperature reduction: On hot days, ventilation helps lower the temperature to optimal levels.
• Supply of carbon dioxide (CO₂): For photosynthesis, plants need carbon dioxide. In enclosed spaces, its concentration can drop, slowing growth.

How to ventilate:

• In greenhouses, vents must be opened, or the film lifted in the morning hours.
• On a windowsill, it is enough to periodically open the window, avoiding drafts that can damage the tender feather.
• The main principle: ventilation should be gentle, without sharp temperature fluctuations. It is ideal to ventilate in the first half of the day.

Summary checklist for rapid growth:

By observing these conditions, you will ensure rapid, uniform feather growth. In the next chapter, we will answer questions about watering and fertilizing: what, when, and whether it is even necessary to fertilize onions for feathers to avoid getting watery and tasteless greens.

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Watering: moisture balance without overwatering

The root system of onions is fibrous, weak, and located in the upper soil layer (10–15 cm) (Brewster, 2008). It cannot extract water from deep layers, so onions for feathers need regular but moderate watering.

The main rule: The soil should be constantly moderately moist, but not wet. Stagnant water at the roots is a sure path to the development of rots (especially fusarium and bacterial rot) (Swiader, 1992; Nonnecke, 1989).

Watering frequency:

• In open ground: On average, once every 3–4 days in normal weather. In hot and dry weather – daily or every other day, but in small doses (about 5–10 l/sq. m) (Pantielev, 1986).
• In a greenhouse and on a windowsill: Watering frequency depends on temperature and air humidity. Focus on the condition of the topsoil: if it has dried to a depth of 1–2 cm, it is time to water. In warm conditions (above +20 °C), watering may be needed daily.

Watering technique:

• Best method: Gentle watering at the root, so that water does not flow into the leaf axils. This reduces the risk of neck rot (Brewster, 2008).
• Water: Use warm, settled water (temperature +20...+25 °C). Cold water can cause stress and slow growth, especially at the beginning of the growing season (Pantielev, 1986).

Watering and feather quality: Excess moisture, especially combined with high temperature, makes the feather watery, brittle, and loses its characteristic pungent taste. The optimal water regime is the key to juicy, dense, and aromatic feathers.

Fertilizing: are they needed at all?

This is the most controversial question. When growing for feathers, the bulb receives its main nutrition from its own reserves. However, in certain cases, fertilizing can be beneficial.

First feeding (nitrogen): After the feather reaches a height of 5–7 cm, a weak nitrogen feed can be given (e.g., manure infusion 1:10 or urea 10–15 g/10 l of water). This stimulates further green growth, especially if the bulbs were initially not very large or you are using poor soil (Pantielev, 1986).

• Caution! Excess nitrogen leads to nitrate accumulation and makes the feather loose, less aromatic, and worse storing (Rubatzky and Yamaguchi, 1997).

Second feeding (potassium): 1–2 weeks after the first, a potassium feed can be given (potassium sulfate 10–15 g/10 l of water). Potassium strengthens tissues, making the feather elastic, juicy, and improving its taste (Brewster, 2008).

Phosphorus: In fertilizing for greens, phosphorus is usually not needed, as it affects root formation and flowering more, which we do not need.

Important rule: Fertilizing should not be frequent or concentrated. Onions for feathers take nutrition from the bulb, and your task is not to overfeed them but only to support them slightly. It is best to combine fertilizing with watering so that nutrients are evenly distributed in the soil (Swiader, 1992).

When fertilizing is contraindicated:

• If you are using large, well-formed selection onions.
• If the soil is initially fertile and well-supplied with organic matter (humus or compost).
• If you plan to do one cutting and harvest quickly.

In such cases, you can do without fertilizing altogether. The onions will produce excellent feathers from their own resources, and you won't risk overfeeding them or accumulating nitrates.

Practical summary:

The main conclusion of this chapter: when forcing onions for feathers, we do not "feed" the plant, but rather create conditions for it to effectively use its own reserves. Watering and, if necessary, light fertilizing are fine-tuning tools that help us obtain maximum yield of succulent and high-quality feathers.

In the next chapter, we will answer the most important practical question: when and how to correctly cut the feather so as not to weaken the bulb and, if desired, get a second harvest.

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Optimal length for cutting

Onions for feathers are ready for harvest when the leaves reach a height of 25–35 cm (Pantielev, 1986). It is during this period that the greens are most succulent, tender, and aromatic. If allowed to overgrow (above 40–45 cm), the feather begins to coarsen, tips turn yellow, and taste qualities deteriorate. Early cutting (less than 20 cm) does not allow for a full harvest and does not recoup planting costs.

Why is this length important? By this time, the bulb has already given up most of its reserves, and the feather has reached maximum biomass while maintaining a tender structure. Further growth occurs not at the expense of the bulb but through photosynthesis, but this slows down the process and can lead to quality deterioration (Nonnecke, 1989).

Cutting technique

Sharp tool: Cut the feather with a sharp knife or pruner to avoid tearing and injuring the remaining part of the bulb.

Cut location: Make the cut slightly above the bulb neck, leaving a small "stump" 2–3 cm high. This protects the growth point from damage and reduces the risk of infection penetration (Swiader, 1992).

Time of day: The best time for cutting is morning or evening in cool weather. In heat, the feather quickly loses turgor, becomes limp, and stores worse.

Cleanliness: Cut leaves are immediately cooled (placed in a cool place or in ice water) to maintain freshness and prevent wilting (Rubatzky and Yamaguchi, 1997).

Important: If you plan to get a second harvest, do not cut the feather too low, do not damage the basal plate, and leave at least one young leaf (or "stump") for continued growth.

Single or multiple cutting?

This question depends on your goal, variety, and quality of planting material.

Single cutting (maximum yield): Used in industrial vegetable growing, where maximum green mass in a short time is important. In this case, onions are planted densely (bridge method), and after reaching the optimal length, all feathers are cut entirely. The bulbs are usually depleted afterward and unsuitable for reuse; they are removed (Pantielev, 1986).

Multiple cutting (up to 2–3 times): Possible when using large, multi-primordium bulbs with a large supply of nutrients. After the first cutting (leaving a 2–3 cm stump), the plants are fed with a weak solution of nitrogen fertilizer (e.g., urea 10 g/10 l of water) and watering continues. After 2–3 weeks, a second, smaller wave of feathers grows back (Brewster, 2008).

Why is the second harvest smaller? The bulb's reserves are already partially spent, so the second feather will be smaller, and its growth slower. However, in amateur gardening, this allows significantly extending the period of consuming fresh greens.

Important limitation: For multiple cutting, only varieties with high primordium count are suitable (e.g., 'Bessonovsky', 'Arzamassky'). Single-primordium varieties, as a rule, do not regrow at all after the first cutting or give very weak regrowth (Rubatzky and Yamaguchi, 1997).

How to extend the harvest: conveyor planting

The most reliable way to have fresh feathers constantly is conveyor planting. The essence of the method is to plant onions in batches at intervals of 2–3 weeks (Pantielev, 1986; Swiader, 1992). For example, in open ground, the first batch is planted in spring, the second – after 2–3 weeks, the third – after another 2–3 weeks. In a greenhouse or on a windowsill, such plantings can be done year-round.

Advantages:

• Ensures continuous supply of harvest without interruptions.
• Allows cutting each batch at the optimal phase, without chasing "overgrown" feathers.
• Reduces the load on a single plant, as cutting is done once, and each bulb gives everything at once.

Brief summary on cutting:

In the next, final chapter, we will analyze the main problems that may arise when growing onions for feathers: diseases, bolting, feather yellowing, and ways to solve them.

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1. Bulb rot (the most common problem)

This is the main enemy when forcing greens. Rots can be caused by fungal (fusarium, white rot, neck rot) or bacterial infections (Brewster, 2008; Swiader, 1992).

Causes:

• Overwatering and water stagnation.
• Planting diseased or damaged bulbs.
• Planting too deep.
• Poor ventilation (especially in greenhouses and hotbeds).

How to solve:

• Prevention is the main method. Thorough sorting and culling of diseased bulbs before planting (Nonnecke, 1989).
• Disinfection: mandatory treatment with fungicides or potassium permanganate (see Chapter 3).
• Proper planting: plant bulbs "up to the shoulders" so that the upper part remains dry and ventilated.
• Watering regime: water moderately, avoiding water stagnation. In cloudy and cool weather, watering is reduced (Pantielev, 1986).
• Ventilation: regularly ventilate greenhouses and hotbeds, especially after watering.

Important: At the first signs of rot (darkening, softening of the bulb, unpleasant odor), the diseased plant is immediately removed with a clump of soil to prevent infection from spreading to neighbors (Swiader, 1992).

2. Bolting (flower stalk formation)

The appearance of a flower stalk is the plant's switch from vegetative growth to generative growth (flowering and seed formation). As a result, the feather becomes coarse, bitter, and loses its marketable appearance (Rubatzky and Yamaguchi, 1997).

Causes:

• Use of large bulbs (more than 3–5 cm) that have already undergone vernalization (storage at low temperatures) (Swiader, 1992).
• Planting selection onions stored at +5...+12 °C – this is the optimal range for flower bud initiation (Brewster, 2008).
• Sharp temperature fluctuations in spring (cold weather after warm) (Nonnecke, 1989).

How to prevent:

• Use small sets (1–2 cm in diameter) or selection onions no more than 3 cm in diameter. Large onions (over 3 cm) almost certainly bolt (Swiader, 1992).
• Proper storage: Selection onions for spring planting are stored at +18...+25 °C. This prevents vernalization (Pantielev, 1986).
• Winter planting: When planting in autumn, choose only frost-resistant varieties and small sets that do not have time to form a flower bud before winter (Brewster, 2008).

What to do if a stalk appears? The stalk is pinched out (broken out) as early as possible. This will not stop flowering but will delay it and slightly improve the quality of the remaining feather. However, such onions will no longer produce a full harvest (Swiader, 1992).

3. Yellowing of feather tips

Yellowing and drying of leaf tips is a signal of stress.

Causes:

• Lack of moisture: Roots cannot extract water from deep layers, and the feather begins to dry from the tips (Brewster, 2008).
• Excess moisture and lack of air: With overwatering, roots suffocate, which also leads to yellowing (Nonnecke, 1989).
• Nutrient deficiency: Especially nitrogen or potassium deficiency (Swiader, 1992).
• Soil acidity: Onions prefer neutral or slightly alkaline environments (pH 6.5–7.5). In acidic soils, nutrient uptake is impaired (Rubatzky and Yamaguchi, 1997).

How to solve:

• Check soil moisture: if dry – water; if wet – reduce watering and loosen the soil for air access.
• Apply fertilizer: at the first signs of starvation, give nitrogen fertilizer (urea 10–15 g/10 l of water) (Pantielev, 1986).
• Liming: if acidic soil is suspected, apply dolomite flour or ash (not at planting time, but in advance, when preparing the bed).

4. Pale and thin feather (stretching)

The feather becomes pale, thin, and brittle, reducing its marketable qualities.

Causes:

• Lack of light. This is the main reason. Onions are very demanding of light (Swiader, 1992; Brewster, 2008).
• Too high temperature (above +28 °C) combined with lack of light.
• Too dense planting (especially in greenhouses) – plants compete for light and nutrition (Nonnecke, 1989).

How to solve:

• Supplementary lighting: In cloudy weather and winter, be sure to use grow lights. The photoperiod should be at least 12–14 hours (Pantielev, 1986).
• Temperature control: With insufficient light, lower the temperature to +16...+18 °C during the day and +10...+12 °C at night to slow stretching (Brewster, 2008).
• Observe planting norms: Do not over-thin plantings beyond measure. For the semi-bridge method, this is 3–6 kg/sq. m; for the bridge method – up to 12 kg/sq. m (Pantielev, 1986).

5. Pests

Although onions for feathers are grown quickly, some pests can cause significant damage.

• Onion fly (Delia antiqua): Larvae damage roots and the bulb, causing rot. Prevention: crop rotation, early planting, treatment with insecticides (e.g., based on imidacloprid) according to instructions (Swiader, 1992).
• Onion weevil: The beetle and its larvae eat passages in the feathers. Control measures: soil loosening, removal of damaged plants, spraying with insecticides (Brewster, 2008).
• Thrips (Thrips tabaci): Suck sap from leaves, causing silvery spots and deformation. Control: treatment with insecticides (e.g., actellik, fitoverm) (Nonnecke, 1989).

Important: When using insecticides, strictly observe the waiting period before cutting the greens! For greens, it is better to use biological preparations or folk methods (ash-soap solution).

Summary table of problems and their solutions:

The main conclusion: most problems can be avoided by following the rules of agricultural technology. A careful approach to bulb preparation, planting, watering, and growing conditions is the key to a healthy and abundant harvest of green onions. In case of problems, early diagnosis and correct actions will help minimize losses.