Watering

Stage 1. Root Establishment (1–2 weeks after planting)

The most critical stage for transplanted cabbage. After transplanting, the root system is damaged, and the plant cannot fully absorb water even if it is present in the soil. At the same time, leaves continue to transpire, and if water is insufficient, seedlings wilt, and in hot weather they may die (Dixon, 2007).

What to do: when planting, be sure to water the hole – at least 0.5 litres per plant. During the first week, water frequently but in small amounts, so that the soil around the roots is constantly moist but not waterlogged. During this period, soil moisture of 80–85% of field capacity is acceptable (Kotov and Adritskaya, 2016).

Important: if the weather is cloudy, the number of waterings can be reduced, but do not allow the surface layer where young roots are located to dry out.

Stage 2. Rosette Growth (from establishment to the start of heading)

After the seedlings have taken root and started to grow, active leaf expansion begins. The plant forms a powerful assimilation apparatus – these leaves will “feed” the future head. Water demand gradually increases, but is not yet critical (Tarakanov and Mukhin, 2003).

The optimal soil moisture during this period is 70–80% of field capacity (Balashev and Zeman, 1981). At this moisture level, plants grow evenly, without surges, and lay a good foundation for the future harvest.

What matters: uneven watering during this phase causes leaf growth to speed up and slow down. This affects the subsequent formation of the head – it may become uneven or loose. Watering should be regular, but not excessive.

Stage 3. Head Formation (the most critical period)

This is the peak of water consumption. It is at this time that cabbage uses the most water – up to 10 litres per day per plant (Tarakanov and Mukhin, 2003). The head rapidly fills, and every cell of the inner leaves must be filled with water.

During this period, optimal soil moisture should be maintained at 80% of field capacity (Dixon, 2007). Even 2–3 days of soil drying can slow head growth, and the lost time cannot be made up – the head will remain small or loose. In hot weather without watering, cabbage may completely stop head formation (Balashev and Zeman, 1981).

What to do: water regularly, without long breaks. In the middle zone, this time usually coincides with July heat, and without watering a quality harvest is impossible. If using overhead sprinkling, be careful that water does not stagnate in the leaf rosette – this can provoke fungal diseases.

Stage 4. Ripening and Pre‑Harvest Preparation (last 2–3 weeks)

When the head has reached the desired size and begins to firm up, water demand decreases. 2–3 weeks before harvest, watering is gradually reduced, and 10–15 days before, it is stopped completely (Balashev and Zeman, 1981; Dixon, 2007).

This is done for two reasons. First, excess moisture during this period causes rapid growth of inner leaves, which begin to press on the head from inside – and it cracks. Second, cabbage harvested at lower moisture content contains more dry matter and stores better in winter (Dixon, 2007).

Exception: if there is severe drought and the heads have not yet gained weight, watering can continue, but you should be guided by the condition of the plants. The main thing is to avoid sharp fluctuations: dry → heavy watering → dry again. These are what provoke cracking.

Brief Summary by Stage

Young Plants (first 2–3 weeks after planting)

During this period, the root system is still weak and shallow. Drying of the topsoil is detrimental. Therefore, water frequently but in small portions – every 2–3 days, and in hot, dry weather even daily (Balashev and Zeman, 1981; Dixon, 2007). Water consumption per plant – 0.5–1 litre, to wet the upper 10–15 cm of soil.

Why so often: young roots cannot draw water from depth, and if the top layer dries out, seedlings stop growing, and in strong heat they may wilt and die.

Mature Plants (from full establishment to the start of ripening)

When cabbage has developed a powerful leaf rosette and its roots have colonised the soil volume within a radius of 40–50 cm and a depth of up to 30–40 cm, watering can be done less frequently but more abundantly. A typical regime is 1–2 times per week, provided that during one watering the soil is wetted to a depth of at least 30 cm (more on this in the next chapter).

Approximate rate: 25–30 litres per 1 m² per watering (equivalent to a 25–30 mm water layer). In hot weather on light soils, intervals are shortened to 5–6 days, on heavy loams and sandy loams – to 7–10 days (Tarakanov and Mukhin, 2003; Dixon, 2007).

Important: it is better to water less often but thoroughly than frequently in small amounts. Frequent shallow watering encourages roots to develop only in the top layer, and plants will suffer during drought. Rare deep watering “trains” roots to grow deeper, making cabbage more resistant to temporary moisture deficits.

Adjustments for Soil Type

Light sandy and sandy loam soils hold water poorly. On them, you will have to water more often – perhaps every 4–5 days, especially in hot weather. At the same time, it is better to slightly reduce the rate (20–25 l/m²) so that water does not move beyond the root zone (Dixon, 2007).

Medium and heavy loams retain moisture much longer. Here intervals between waterings can reach 7–10 days even in summer. However, it is important to ensure that water does not stagnate – on waterlogged heavy soils, cabbage roots suffer from oxygen deficiency.

Organic (peat) soils are the most moisture‑retentive. On them, cabbage can be watered less frequently, but in dry years moisture control is still necessary.

Adjustments for Weather

Practical Way to Determine If Watering Is Needed

Do not rely solely on the calendar. Check the soil at a depth of 10–15 cm:

• If a lump of soil rolls into a tight ball – moisture is sufficient.
• If a ball forms but crumbles with light pressure – it is time to water.
• If the soil does not roll at all and crumbles to dust – the cabbage is already under stress, watering is urgently needed (Dixon, 2007).

Mistakes to Avoid

Mistake 1. Watering frequently and shallowly. This forms a surface root system that will suffer from any drought.

Mistake 2. Waiting until the plant droops its leaves. By that time, it has already lost part of its potential yield – recovery will be difficult.

Mistake 3. Watering with cold water from a well or borehole directly onto the leaves. Cold stress delays growth, and wet foliage in hot weather is a path to fungal diseases. It is better to use water warmed by the sun and, if possible, apply it at the root.

In the next chapter, we will look at how deep the soil should be wetted with each watering and why this is more important than it seems.

Active Root Zone: Where the Root Lives

In cabbage grown from transplants, the bulk of the roots are concentrated in the upper 20–30 cm layer of soil (Dixon, 2007). Some individual roots may go deeper – up to 70–80 cm – but the plant takes the main nutrition and water from this horizon. In cabbage sown directly in the field, the root system penetrates deeper – up to 1 metre or more, making it more drought‑tolerant (Balashev and Zeman, 1981; Tarakanov and Mukhin, 2003). However, in amateur gardening, transplanting is predominant, so we will proceed from that.

Rule No. 1: to water effectively, water must reach the depth where the main absorbing roots are located. If you moisten only the top 5–10 cm, while the soil below remains dry, roots will not grow deeper, and any surface drying will be a disaster for the plant.

Recommended Wetting Depth by Growth Stage

Why Deep Watering Is Better Than Shallow

Shallow watering (where water only wets the top layer) forms a surface root system. Roots do not go deeper because it is dry there. As a result, the plant becomes dependent on every rain and watering – as soon as the top layer dries out, cabbage slows growth.

Deep watering (where water penetrates to 30–40 cm) has the opposite effect. Roots, sensing moisture in deeper horizons, grow towards it. Such a plant tolerates 3–5 days without water more easily because it has a reserve of moisture in deeper layers. In addition, a deep root system anchors the plant better, preventing it from lodging under the weight of a large head (Balashev and Zeman, 1981; Tarakanov and Mukhin, 2003).

Moreover, deep watering reduces watering frequency. Instead of watering a little every 2–3 days, you can water abundantly once every 6–8 days, saving both time and water.

How to Check How Deep the Water Has Penetrated

The simplest and most reliable method is a spade or garden auger. One to two hours after watering, dig a small hole in the row spacing (trying not to damage roots) and see at what depth the soil is moist and where it is already dry.

• Good: moisture has penetrated to 25–30 cm or more.
• Satisfactory: 15–20 cm. For the rosette growth stage this is too little – increase the watering rate.
• Bad: moisture is only in the top 5–10 cm. This is shallow watering that needs to be changed.

You can also use a simple stick test: in dry soil, a stick goes in with difficulty; in moist soil, easily. Push a stick to a depth of 30 cm and feel where there is resistance (dry) and where there is none (moist).

How to Achieve the Desired Wetting Depth

Wetting depth depends on the watering rate (amount of water per unit area) and soil type:

• On sandy loams and light loams, water penetrates faster and deeper, but also drains faster. To wet 30 cm, you need 25–30 mm of water (25–30 litres per 1 m²).
• On medium and heavy loams, water penetrates slower but stays longer. The same depth may require 30–35 mm.
• On peat soils, water‑holding capacity is high, and permeability is good – 25 mm is enough.

Practical advice: if after watering you find that the water has not reached the desired depth, the watering rate is insufficient. Next time, increase the volume of water, but not the frequency – it is better to water less often and deeper.

Mistakes Related to Depth

Mistake 1. “Sprinkling” watering – when the gardener from a hose or watering can only slightly moistens the surface. The water evaporates before reaching the roots, and the crust on the surface only hinders respiration.

Mistake 2. Watering too quickly on heavy soil. Water does not have time to soak in and runs off the surface or pools in depressions. It is better to split the rate into two parts with a 20–30 minute interval.

Mistake 3. Expecting that raindrops will replace full watering. A summer downpour often only wets the top layer, while the root zone remains dry. Therefore, even after rain, check the wetting depth: if it is less than 15–20 cm during the growth phase, additional watering is needed.

Drip Irrigation: The Most Precise and Economical

Drip irrigation is a system of tubes or tapes with emitters that deliver water directly to the root zone of each plant. Among all methods, it offers the best combination of efficiency and plant health.

Advantages:

• Water goes strictly to the roots, without wetting the leaves. This reduces the risk of fungal diseases, particularly downy mildew (peronospora) and bacterial diseases, which actively develop on wet leaves (Dixon, 2007; Tarakanov and Mukhin, 2003).
• The soil between plants remains dry – weeds grow less, and you spend less time weeding.
• Water consumption is minimal – with drip irrigation, almost no water is lost to evaporation, unlike sprinkling. Efficiency reaches 90–95% (Dixon, 2007).
• Irrigation can be automated – install a timer, and cabbage will receive water even in your absence.
• If needed, dissolved fertilisers can be supplied through the system – this is called fertigation (Dixon, 2007). Nutrients go directly to the roots and are absorbed as quickly as possible.

Disadvantages:

• Requires initial investment: purchase of drip tape, fittings, possibly a controller.
• Water should be filtered so that emitters do not clog.
• On large areas, the system requires proper layout, but for 1–2 beds it is easy.

When to choose: drip irrigation is the best choice for those who want to save water, avoid spraying leaves, and minimise manual labour. It is especially good in arid regions and on light sandy soils, where water quickly percolates and frequent watering can be easily automated.

Tip: for cabbage, lay drip tape along the row, 5–10 cm from the stem. This way water reaches the active root zone but does not wet the root collar.

Furrow Irrigation: An Old and Reliable Method

Furrow irrigation is a classic for relatively flat areas with heavy soils. Shallow grooves (furrows) are cut between rows of cabbage, and water is run along them. It soaks sideways and downwards, nourishing the root zone.

Advantages:

• Simplicity – no complex systems needed, just make furrows with a hoe or hiller and supply water through a hose or channel system.
• Water penetrates deeply, promoting the development of a powerful root system. With proper furrow irrigation, wetting depth reaches 30–40 cm (Balashev and Zeman, 1981).
• Leaves stay dry – as with drip irrigation, disease risk is reduced.

Disadvantages:

• Requires a level plot – on slopes, water runs unevenly, and some plants receive less moisture.
• Water consumption is higher than with drip irrigation; part of it is lost to filtration below roots and evaporation from the furrow surface.
• After watering, a crust forms at the bottom of the furrows, which needs to be loosened to maintain soil gas exchange.
• Takes more time for preparation and monitoring than automatic drip irrigation.

When to choose: furrow irrigation works well on loamy and clayey soils that absorb water slowly and retain it for a long time. It is often used on relatively large plots where drip installation is not possible but there is a water source with good pressure.

Tip: make furrows 10–15 cm deep, with 50–60 cm between them. Run water slowly so that it has time to soak in and not wash away the soil.

Sprinkler Irrigation: Imitating Rain

Sprinkler irrigation is watering from above using sprinklers, hose nozzles, or stationary sprinkler installations. Water droplets fall on leaves and soil like rain.

Advantages:

• Not only the soil but also the ground layer of air is humidified. In hot weather, this raises relative humidity, which benefits cabbage, especially during head formation (Tarakanov and Mukhin, 2003).
• No need to make furrows or lay drip tape – watering evenly covers the entire area.
• Combines well with foliar feeding – fertilisers can be dissolved in water and applied through the sprinkler, landing directly on leaves.

Disadvantages:

• Leaves become wet, which in cool or cloudy weather increases the risk of fungal diseases (powdery mildew, downy mildew, alternaria) (Dixon, 2007; Kotov and Adritskaya, 2016).
• On hot sunny days, water droplets on leaves can act as lenses and cause burns, so sprinkling is best done in the morning or evening.
• A significant portion of water is lost to evaporation, especially in windy weather, reducing efficiency.
• If water is hard or cold, it may leave lime deposits on leaves or cause stress.

When to choose: sprinkling is a good option for small plots with loose soil and if you can water in the evening or early morning so that leaves dry before the heat. In arid southern regions, refreshing sprinkling (50–80 m³/ha) is even recommended in addition to the main irrigation to increase air humidity (Balashev and Zeman, 1981; Dixon, 2007).

Tip: for cabbage, nozzles with large droplets are best – they are less dispersed by wind and better wet the soil. Avoid frequent light sprinklings – they only moisten the surface and do not reach the roots.

Hand Watering with a Watering Can or Hose

The most accessible method for gardeners, especially if cabbage is planted in a few beds. Water with a hose with a breaker or from a watering can at the root.

Advantages:

• Full control – you see each plant and can give more water to a weak one, less to a head that is already filled.
• No additional systems or devices needed.
• Any water can be used – even without filtration.

Disadvantages:

• Labour‑intensive – especially if the plot is large or in hot weather when watering is needed frequently.
• It is difficult to achieve uniform wetting to a depth of 30 cm without large volumes of water.
• When watering with a hose, the stream can wash away soil near the roots, exposing them.
• Water often gets on leaves, especially with careless movements.

When to choose: hand watering is the choice for a small garden and for cases where cabbage is planted in mixed beds or containers. It is also used when other methods are unavailable due to lack of equipment or water supply.

Tip: water only at the root, trying not to wet the leaves. To do this, remove the breaker from the watering can or hose and direct the stream straight to the root zone. Do it slowly so that water soaks in rather than runs off the surface. Watering into shallow holes or ring furrows around the plant works well.

Comparison Table of Watering Methods

General Recommendations

1. Leaves should remain dry. Whichever method you choose, try to keep water from lingering on leaves and in the rosette. Wet foliage + heat is a route to fungal diseases. The exception is rare refreshing sprinkling in extreme heat, but do it in the evening so leaves dry by night.

2. Water should be warm. Cabbage does not like ice‑cold water from a well. Fill a barrel and let it warm in the sun for at least half a day. Room‑temperature water (about 18–20 °C) is taken up by roots without stress.

3. Water regularly, but without excess. It is better to water deeply and thoroughly once than to “sprinkle” every day. Adjust the regime to your soil and weather.

Early Signs: When Things Can Still Be Corrected

At this stage, the plant has not yet suffered seriously, but it is already letting you know: “I need water.”

Sign 1. Loss of turgor during the daytime

On a hot sunny day, leaves become less firm, slightly drooping, although they look normal in the morning. This is a classic signal – the plant is transpiring more water than it receives. If no action is taken, wilting will intensify by evening and may become permanent the next day (Dixon, 2007; Tarakanov and Mukhin, 2003).

What to do: check soil moisture. If the top 10 cm are dry – it is time to water. Do not wait until the leaves droop completely.

Sign 2. Change in leaf colour

With moisture deficiency, cabbage leaves take on a bluish or dull hue, losing their characteristic bright green gloss. On some varieties, a slight reddish‑purple tint appears – a signal that phosphorus nutrition is impaired due to soil drying (Startsev, 2021). Leaves become matte, sometimes slightly curled at the edges.

Sign 3. Slowed growth

If during active rosette growth or head formation you notice that new leaves appear less often and old ones hardly increase in size – it is most likely a lack of water. With sufficient moisture, cabbage in warm weather can produce 2–3 new leaves per week. Under stress, growth slows or stops (Balashev and Zeman, 1981; Kotov and Adritskaya, 2016).

Sign 4. Reduction of waxy bloom

Healthy cabbage leaves are covered with a bluish waxy bloom that protects against excessive transpiration. With prolonged water deficit, the plant tries to conserve moisture by increasing the bloom, but with acute deficiency it becomes thinner or disappears. This is a subtle sign noticed by experienced gardeners.

Late Signs: The Plant Is Already Suffering

If early signals are ignored, a stage begins when yield declines irreversibly.

Sign 5. Permanent wilting of leaves

Leaves lose turgor and do not recover even by morning. The lower, older leaves start to yellow and die, while young ones curl and become stiff, almost brittle. This means that the roots are no longer coping, and some cells are dying (Dixon, 2007).

Sign 6. Stop of head formation

During the most critical period – when the head should be filling – growth ceases. The head remains small and loose, and if heat and drought persist, the plant may bolt (go to seed) prematurely, especially in early‑maturing varieties. This is a protective mechanism: the plant tries to leave offspring without waiting for a full head (Balashev and Zeman, 1981).

Sign 7. Bitterness in leaves

Under severe water stress, bitter substances – glucosinolates and other defence compounds – accumulate in the leaves. The cabbage becomes unpleasantly bitter, and this taste does not disappear even after watering. Unfortunately, this is a sign that the quality of the crop has been irreversibly reduced (Dixon, 2007).

How to Check the Soil: The Main Diagnostic Tool

It is more reliable to rely on soil condition rather than leaf appearance. Here are a few simple methods.

Lump of soil test (already mentioned in Chapter 3). Take a handful of soil from a depth of 10–15 cm:

• If it rolls into a tight ball – moisture is sufficient.
• If it rolls but crumbles under pressure – it is time to water.
• If it does not roll at all – the soil is dry, watering is urgently needed (Dixon, 2007).

Stick or auger test: push a thin metal or wooden stick into the soil to a depth of 20 cm. In dry soil it goes in with difficulty, in moist soil – easily. If at a depth of 15–20 cm the stick is hard to push, the root zone is dry.

Visual assessment: cracks on the soil surface are a clear sign of severe drought. But this is a late signal. It is better to check earlier, when cracks are not yet present.

Impact of Water Deficiency on Yield: Specific Figures

Scientific research and practical experience show that water stress can reduce cabbage yields by 30–50% or more (Tarakanov and Mukhin, 2003; Dixon, 2007). Two periods are especially critical:

• Head formation phase. A watering delay of even 3–5 days during this time can reduce head weight by 20–40%. Catching up is almost impossible because the head grows quickly, and its peak growth lasts only 2–3 weeks.

• Active rosette growth period. If the soil dries out at this time, plants form fewer leaves, which means the head will have a smaller “reserve” of nutrients, also affecting its size (Dixon, 2007).

In addition, water shortage increases the number of non‑standard heads – small, loose, underdeveloped – and also increases susceptibility to pests and diseases. Weakened plants are more easily attacked by aphids, cabbage fly, and bacterial diseases.

What to Do If You Are Late with Watering

If the cabbage has already wilted, do not try to compensate all at once with a heavy watering. This can cause shock – dry roots, plunged into a “bog”, begin to suffocate and die.

Correct actions:

1. First, lightly moisten the soil – give 0.5–1 litre per plant so that roots gradually “get used” to water.

2. After an hour or two, carry out a full watering at a rate of 20–25 l/m² to reach deep layers.

3. The next day, loosen the soil surface (if not mulched) to break the crust and restore gas exchange.

In the next chapter, we will look at what happens when there is too much water and why overwatering can be even more dangerous than drought.

Root Suffocation: When There Is Too Much Water

Water fills the pores in the soil. If there is too much moisture, all available pore space is occupied by water, leaving no room for air. Cabbage roots, like all living tissues, need oxygen for respiration. Without air, they cannot function – they cannot absorb nutrients, grow, and in severe cases, they die.

What happens in waterlogged soil:

• Root respiration slows and then stops.
• Absorption of water and mineral elements is impaired – paradox: roots stand in water, but the plant begins to starve.
• Under anaerobic (oxygen‑free) conditions, harmful microorganisms that cause root rots become active.
• The activity of beneficial soil microflora, which converts organic matter into plant‑available nutrients, decreases.

Signs of overwatering in cabbage

Cabbage responds quite quickly to excess moisture, and these changes are noticeable even to an inexperienced eye.

Sign 1. Blue‑purple colouration of leaves

This is the most characteristic early signal. Leaves, especially the lower and middle tiers, take on a bluish or violet‑grey hue. This colouration appears due to the accumulation of anthocyanin – a protective pigment that the plant produces in response to stress (Kotov and Adritskaya, 2016; Startsev, 2021). In this case, the stress is caused by oxygen deficiency at the roots, which disrupts phosphorus nutrition.

Important: many gardeners confuse this symptom with phosphorus deficiency and start applying phosphorus fertilisers. But the cause here is not a lack of phosphorus in the soil, but that the roots cannot absorb it due to overwatering. Instead of solving the water problem, they waste time and fertilisers.

Sign 2. Slowed growth, leaves become smaller

With overwatering, cabbage growth slows almost as much as with drought. New leaves appear less frequently, old ones do not increase in size. Young leaves in the centre of the rosette may remain small and pale, while lower leaves prematurely yellow and drop (Balashev and Zeman, 1981).

Sign 3. Drooping appearance

Leaves may lose turgor even when the soil is moist. This is because damaged roots cannot pump water. With overwatering, turgor is often lost during hot hours and recovers by morning, creating a false impression that everything is fine.

Sign 4. Root death

If you carefully dig up a plant from a waterlogged bed, you may notice that some roots have turned brown or dark, losing elasticity. This is the initial stage of root rot. Such roots no longer function, and the plant gradually dies.

Diseases Associated with Overwatering

Wet roots and high air humidity are ideal conditions for a whole range of diseases.

Slime rot (bacterial soft rot). This is one of the most dangerous diseases of cabbage, especially in rainy years and on waterlogged plots. The causative agents are bacteria Erwinia carotovora and E. aroideae. They enter through mechanical damage and live in soil and plant debris. At high humidity, bacteria actively multiply, softening head tissues. Leaves become oily, darken, become slimy, and emit an unpleasant odour. A head can rot completely in just a few days (Autko et al., 2012; Startsev, 2021).

Grey mould. The fungus Botrytis cinerea in the field usually attacks weakened lower leaves, especially in wet weather. And in storage, this disease becomes one of the main causes of losses. Grey mould covers the heads, and they rot (Autko et al., 2012).

White rot. Caused by the fungus Sclerotinia sclerotiorum. It affects the root collar and lower leaves in the field, and in storage it quickly spreads from a diseased head to neighbouring ones. A white cottony coating – the mycelium of the fungus – appears on affected tissues (Autko et al., 2012).

Root rots. Various fungi of the genera Fusarium, Pythium, Rhizoctonia actively develop precisely in waterlogged soil, especially on heavy soils. They attack the root system, leading to plant suppression and often death (Oklahoma, 2016).

Downy mildew (peronospora). The fungus Peronospora parasitica is especially active at high air humidity – in rainy weather, with heavy dew, or after frequent sprinkling. A white coating appears on the underside of leaves, and yellowish spots on the upper side. Leaves turn yellow and die (Autko et al., 2012; Tarakanov and Mukhin, 2003).

Alternaria (black spot). The fungus Alternaria brassicae also loves wet weather. Dark spots with concentric rings, resembling a “target”, appear on leaves and heads. During storage, these spots enlarge, and the affected tissues rot (Autko et al., 2012; Startsev, 2021).

Important: all these diseases are much less common in dry weather. That is why moisture control is not only a matter of growth but also of plant health.

Other Consequences of Overwatering

Leaching of nutrients. Excess water washes out nitrogen in nitrate form and other mobile elements from the root zone, especially on light soils. Cabbage, which is already demanding in nutrition, begins to starve (Dixon, 2007).

Head cracking. This occurs not only with a sharp transition from drought to watering, but also with heavy prolonged rains during ripening. Heads absorb water, inner leaves grow faster than outer ones, pressure increases – and the head splits (Balashev and Zeman, 1981; Dixon, 2007).

Reduced storage ability. Cabbage grown under excessive moisture contains more water and fewer dry matter. Such heads store worse, rot faster, and lose firmness. Overwatering in the last 3–4 weeks before harvest is especially critical (Dixon, 2007; Tarakanov and Mukhin, 2003).

What to Do If the Plot Is Waterlogged

If there are prolonged rains:

1. Stop watering completely. Obvious, but sometimes gardeners continue watering out of habit, ignoring the rain. Water is not needed until the soil dries to a “moist but not wet” state.

2. Loosen the soil. As soon as the rain stops, carefully loosen the row spacing (not deeply, so as not to damage roots). This breaks the crust, restores gas exchange, and helps excess moisture evaporate.

3. Hill up the plants (or slightly cover the stem). This protects the root collar from rotting. But do this only if the plants are already large enough.

4. Check drainage. On clayey and heavy soils, water may stagnate. If this is a recurring problem, consider making raised beds (ridges) or adding sand and organic matter to improve structure (Kotov and Adritskaya, 2016; Tarakanov and Mukhin, 2003).

5. Remove severely damaged leaves. If lower leaves have yellowed or become spotted, remove them. This improves air circulation and reduces the risk of fungal spread.

If overwatering is due to improper watering:

• Review the regime: water less often but deeper.
• Check whether water is running onto your bed from neighbouring areas.
• On heavy soils, it is better to use drip irrigation or furrow irrigation with controlled water volume, rather than sprinkling.

Prevention: How to Avoid Overwatering

1. Choose the right spot for the bed. Avoid lowlands and areas with a high water table – cabbage roots do not tolerate stagnant water. The optimal groundwater level is no higher than 1.5–2 metres (Tarakanov and Mukhin, 2003; Kotov and Adritskaya, 2016).

2. Improve soil structure. Add organic matter (compost, manure) to loosen heavy soils and increase water‑holding capacity of light soils. This creates a crumbly structure where air and water are balanced.

3. Install drainage. If the area is prone to waterlogging, arrange drainage ditches or make raised beds (ridges). On ridges, the cabbage root system is above the possible water stagnation level (Tarakanov and Mukhin, 2003).

4. Water only when necessary. Use soil moisture tests, not a schedule. The soil should have time to dry slightly between waterings, but not dry to dust.

Summary: The Golden Mean

The main principle is not to fear water, but to respect its power. Cabbage loves moisture, but cannot stand a swamp. Give it exactly as much water as it can use – and no more.

Why It Is So Important to Reduce Watering Before Harvest

In the ripening phase, heads have already gained most of their weight, and now their task is not to grow but to firm up. Inner leaves continue to grow a little, but if you give the plant a lot of water, this process accelerates. Inner leaves grow faster than outer ones, creating excess pressure – and the head cracks. Cracking is the most visible harm, but not the only one.

Three key reasons to reduce watering:

1. Preventing cracking. A sudden influx of water when the head is already firm leads to tissue rupture. Especially dangerous are fluctuations: long drought followed by heavy watering or downpour (Balashev and Zeman, 1981; Dixon, 2007).

2. Improving storage ability. Heads harvested from wet soil contain more water and less dry matter. During storage, they lose turgor faster, wilt, and are more susceptible to grey and white rot. Cabbage that received moderate moisture at the end of the season stores 2–3 months longer (Dixon, 2007; Tarakanov and Mukhin, 2003).

3. Enhancing flavour. With limited watering, more sugars accumulate in the leaves, and heads become sweeter. Excess water, on the contrary, dilutes the taste, making cabbage watery and bland (Balashev and Zeman, 1981).

When to Start Reducing Watering

General rule: 2–3 weeks before the planned harvest, watering is gradually reduced, and 10–15 days before it is stopped completely (Balashev and Zeman, 1981; Dixon, 2007). However, exact timing depends on the variety and weather.

Guidelines for different maturity groups:

How to determine when it is time to start reducing watering:

• The head has reached the typical size for the variety and feels firm to the touch.
• The upper leaves begin to turn slightly yellow or bend outward – a sign of the end of vegetation.
• The lower leaves begin to wither and drop – a natural aging process that signals imminent harvest.

How to Properly Reduce Watering

Gradualness is the main principle. Abruptly stopping watering is also stressful. It is better to reduce the volume gradually:

1. First week: water with the usual frequency, but reduce the rate by 25–30%. For example, if you applied 25 l/m², now 15–18 l/m² is enough.

2. Second week: increase intervals between waterings by 1.5–2 times. Water only if the soil dries to a “dusty” state at a depth of 10 cm.

3. Third week (if applicable): stop watering completely. Plants use the remaining moisture in the soil, and the top layer dries.

In southern arid regions, completely stopping watering 2 weeks before harvest can be risky – if there is strong heat and wind, heads may begin to wilt. In such cases, a light watering 7–10 days before harvest is allowed, but with a minimal rate of 10–12 l/m² (Dixon, 2007).

Important: on light sandy soils, reduce watering more gradually than on loams because they lose moisture faster. On peat soils, on the contrary, you can stop watering earlier – they hold water for a long time.

What to Do in Case of Rains Before Harvest

Prolonged rains during ripening are the main threat to future storage. If forecasters promise heavy rain and the cabbage is almost ready:

1. If possible, accelerate harvest. Heads that have reached technical maturity can be harvested before the rain. Even if they are not perfectly firm, it is better to collect them dry than to leave them under rain and get cracking.

2. If rain is already falling and harvest is impossible, help the plants “shed” excess moisture. You can carefully break a few roots to reduce water uptake (see below).

3. Ensure water does not stagnate. If the plot is in a low spot, make drainage channels to carry water away from the beds.

4. After rain, allow the soil to dry for at least 2–3 days before starting harvest. Heads cut immediately after a downpour will be waterlogged and store poorly.

How to Check That Cabbage Is Ready for Harvest

When watering has already been reduced or stopped, it is important to determine the right moment for cutting.

Signs of technical maturity:

• The head is firm to the touch – when squeezed with fingers, it does not depress but springs back.
• The upper leaves of the head are tightly packed, with no gaps between them.
• The colour of the head corresponds to variety characteristics (for white cabbage – white or creamy‑white inside, outer leaves green or grey‑green).
• Outer leaves begin to yellow and slightly dry at the edges – a natural sign of growth slowing.
• The head has not increased in size for a week under observation.

For early varieties – a flexible deadline: they quickly overripen and crack, so they are harvested as soon as the head becomes firm, even if it has not reached the maximum size for the variety.

Optimal harvest times:

• Early‑maturing varieties – when head weight reaches 0.8–1.5 kg (usually 60–70 days after planting).
• Mid‑season – 2–4 kg.
• Late‑maturing for storage – 3–5 kg or more (Startsev, 2021; Dixon, 2007).

A Clever Trick: Root Pruning

If heads are already ripe and the weather is wet or heavy rain is expected, you can artificially limit water intake. This is done using root pruning.

How it is done:

• Take a sharp spade and at a distance of 10–15 cm from the stem, drive the spade deeply (20–25 cm) as if cutting the roots on one side. You can make 2–3 such cuts around the plant.
• Another method: slightly lift the head upward and turn it 90 degrees, as if “unscrewing” it from the ground (this method is described in gardening recommendations – see, for example, Iowa State, 2024; South Dakota, 2024; Utah, 2020). This breaks some of the small absorbing roots, and water uptake is sharply reduced.

After pruning, the cabbage can be left in the bed for a few more days – during this time the head will dry, become denser, and better tolerate storage. This technique is especially relevant for northern regions, where autumn rains often occur before harvest.

Important: pruning is done no earlier than 4–7 days before harvest, and only when you are completely sure that the heads are ripe.

How Watering Affects Storage: A Brief Summary

What to Do If a Head Has Cracked

If cracking has occurred, do not despair. Such a head cannot be stored for a long time, but it can be used fresh or processed. Cut the head and immediately put it in the refrigerator – in warmth, the crack will quickly rot. If the crack is small, it can be dusted with ash or crushed charcoal to stop bacterial development, and use the head within a few days.

Practical Summary of Pre‑Harvest Watering

• Start reducing watering when the head has reached the typical size and firmness for the variety.
• Stop watering 10–15 days before harvest.
• If it rains, speed up harvest or prune roots.
• Cut heads only in dry weather, when the soil has dried.
• For late‑maturing varieties intended for storage, the reduction of watering should be particularly strict.