How Often to Water Kale
Quick answer:
Water young kale every few days in dry weather until it's settled in, usually the first three or four weeks after planting out. After that, kale in the ground only needs a good soak during long dry spells, roughly once a week when there's been no rain. Through autumn and winter, rain usually does the job for you. Kale in pots is different: check the compost every day or two in summer and water whenever the top few centimetres feel dry.
Kale is one of the least thirsty crops on the plot once it's established. Its roots go deep, the plant grows steadily rather than fast, and it spends most of its life in the cooler, wetter half of the year. The watering that really matters happens in a short window just after planting.
Watering kale through the year
After sowing (March–June): keep the seedbed or modules moist so the seeds come up evenly. A light watering every day or two in dry spells is enough.
After planting out (late spring to early summer): this is the stage to get right. Young plants have only a small root ball and can dry out within days of warm weather. Water them in well on the day you plant, then every few days if it stays dry, until you see fresh new leaves.
Summer: once plants are growing strongly, leave them alone unless there's been a week or more without rain. Then give each plant a thorough soak rather than a little every day.
Autumn and winter: you'll rarely need to water kale in the ground. The weather keeps the soil moist, and growth slows right down in the cold.
Spring, second year: plants start to flower and finish. There's no need to water them now.
For the full growing season, see how to grow kale in the UK
How to water kale
Soak, don't sprinkle. A full watering can per plant reaches the deeper roots. Little and often keeps the roots near the surface, where they dry out quickly.
Aim at the soil, around the base of the stem, rather than over the leaves.
Water in the morning where you can, so any splashes dry off during the day.
Check before you water. Push a finger into the soil beside the plant. If it's damp a few centimetres down, leave it.
Mulching to save water
A layer of garden compost or well-rotted manure spread around the plants after a good rain keeps moisture in the ground for much longer. It also smothers weeds, which would otherwise compete with young kale for water. Leave a small gap around each stem.
Watering kale in containers
A pot holds only a small amount of compost, so container kale needs watering far more often than kale in the ground, and right through the season, not just in dry spells. In summer, that can mean every day or two. In winter, check about once a week, since pots under eaves or against walls can miss the rain.
Stand pots on feet or bricks so water drains away, as compost that stays soggy in winter can rot the roots.
For more detail, see growing kale in containers
Signs kale needs water
Young plants wilting in the afternoon and not recovering by evening
Lower leaves yellowing early or turning tough
Slow, stunted growth after planting out
Soil dry and dusty a few centimetres down
Established kale can droop briefly on a hot afternoon and perk up by evening. That's normal and doesn't mean it needs watering.
For more detail, see signs of underwatering vegetables
Signs of too much water
Kale doesn't like sitting in wet soil, especially in winter on heavy ground. Yellowing lower leaves with soil that stays wet, soft or rotting stems at soil level, and plants that stop growing can all point to waterlogging rather than drought. If your soil holds water, grow kale in a raised bed or add plenty of organic matter before planting.
For more detail, see signs of overwatering vegetables
For general watering advice across the plot, see how often to water a vegetable garden
If your kale is struggling for other reasons, see why kale doesn't grow
Common questions
How often should you water kale?
Every few days in dry weather for the first three or four weeks after planting out. After that, only when there's been a week or more without rain. Kale in pots needs checking every day or two in summer.
Does kale need watering in winter?
Kale in the ground rarely needs watering in winter, as rain keeps the soil moist. Kale in pots may still need a drink if it's sheltered from the rain.
Can you overwater kale?
Yes. Kale dislikes soil that stays wet, especially in winter. Yellow lower leaves in soil that never dries out can be a sign of too much water rather than too little.
Should you water kale every day?
Not in the ground. Daily light watering keeps roots near the surface. A deep soak when the soil is dry a few centimetres down is better. Only pots in hot weather may need water daily.
Watering and care based on RHS guidance.