How Often to Water Cabbage
Cabbages are thirsty, leafy plants, but once they've settled in they're more forgiving about watering than many people expect. The trick is knowing when they need you most: as young plants with small roots, and again when the heads start to form and swell. Get those two stages right and you'll be cutting firm, heavy heads.
The weather, the type of cabbage you're growing and whether it's planted out or potted up all affect how often the can needs filling.
How often should you water cabbage?
Water young cabbages regularly until they've settled in and are growing strongly. After that, established cabbages in the ground only need watering in dry spells, when the RHS recommends a thorough soaking roughly every 10 days rather than frequent light watering. Once the heads start to form, extra watering helps them grow bigger. Cabbages in containers need checking every couple of days, as pots dry out much faster.
Watering young cabbage plants
Freshly planted cabbages have only a small root system and can't reach water deep in the soil. Water them in well when you plant them, then keep the soil moist over the next few weeks until they're clearly growing away. A young plant that dries out can be set back for weeks.
Watering established cabbages
Once the roots have spread, cabbages can find water further down, so they need far less help from you. In a dry spell, give the ground around them a really thorough soaking every 10 days or so, so the water reaches right down to the deeper roots. One deep watering does far more good than several quick splashes, which only wet the top.
Water more as the heads form
When the leaves begin to fold into a heart, the plant is building the part you're going to eat. This is the time to be generous: extra water now leads to bigger, heavier heads. If you're short of water, or on a hosepipe ban, save it for cabbages at this stage.
Mulch to save water
After a good soak, lay a generous blanket of old manure or homemade compost over the soil between the plants. It keeps the soil moist for much longer and means you need to water less often.
Watering cabbage in containers
Cabbages in pots have a limited amount of compost to draw on, so they dry out far quicker than those in the ground. Pick the biggest pot you can, feel the compost every other day (every day in warm spells), and water until you see it trickle out underneath. Compact summer varieties are the best choice for pots.
For container advice, see growing cabbage in containers
Winter cabbages
Winter cabbages and Savoys grow slowly through autumn and stand in the ground over winter. Once the autumn rains arrive, they rarely need watering, though young winter cabbages planted out in a dry late summer will need help settling in.
Watering and split heads
A mature cabbage that's been left dry and then gets a sudden soaking, from a downpour or a heavy watering, can take up so much water that the head bursts open. Watering steadily through dry spells, rather than letting the soil dry out completely, helps prevent it. The other key is to cut heads promptly once they feel solid.
For more on picking at the right time, see when to harvest cabbage
Signs of watering problems
Young plants wilting or stalling: roots too small to cope with dry soil, so water more often until established.
Small, loose heads: short of water while the heads were forming.
Heads splitting: sudden heavy water after a dry spell, or left too long after maturing.
Yellowing leaves and a plant that sulks: ground that stays sodden.
For other causes, see why cabbage doesn't form heads
Avoiding overwatering
Cabbages dislike waterlogged ground, where roots can struggle and rot. Grow them in fertile, free-draining soil, avoid spots that stay soggy, and make sure containers have drainage holes.
You can read more in how often to water a vegetable garden
Healthy cabbage growth
Cabbages grow best with regular watering while young, a deep soak every 10 days or so in dry spells once established, extra water as the heads form, and a mulch to lock moisture in.
For growing advice, see how to grow cabbage in the UK
For timing, see when to plant cabbage
Common questions
How often should I water cabbage?
Water young plants regularly until established. After that, cabbages in the ground only need watering in dry spells, with a thorough soaking about every 10 days. Give extra water when the heads start to form. In pots, check every couple of days.
Do cabbages need a lot of water?
They need steady moisture as young plants and again as the hearts develop, but established cabbages in the ground are fairly tolerant and only need watering in dry spells.
Why has my cabbage split?
Usually because a mature head drew in a rush of water all at once, after a downpour or heavy watering broke a dry spell. Water steadily through dry spells and harvest heads once they're firm.
Do winter cabbages need watering?
Once they're established, winter cabbages rarely need watering, as autumn and winter rain is usually enough. Water only if they were planted out into dry soil in late summer, or if they're growing in containers.
Watering advice based on RHS guidance.