Kale is one of the easiest crops you can grow in a UK garden. It’s hardy, nutritious, and produces for months on end, even through the coldest parts of winter. Whether you have a big allotment, a small garden bed, or even a few containers, kale can fit into your space and give you a steady supply of healthy greens.
Kale belongs to the Brassica family, which also includes cabbage, broccoli, and sprouts. It grows best in cooler weather, making it an excellent crop in the UK for spring, autumn, and winter. In fact, Kale tastes even better after a light frost, as the cold helps sweeten the leaves.
Different varieties include curly kale, cavolo nero (also called Tuscan kale or black kale), and red Russian kale, which has attractive reddish stems and flat leaves. All types are easy to grow and follow the same basic process.
Sowing Kale Seeds
To get started, you can either sow kale seeds directly in the ground or start them off in trays and transplant them later. If you’re sowing outdoors, wait until the soil has warmed up a bit in spring—usually around March or April.
Use a rake to create a fine, crumbly surface, then draw shallow rows in the soil with a stick or the edge of your hand. Sow the seeds about half a centimetre deep, leaving around 15 centimetres between each one. Cover them gently with soil and water well. You should see seedlings begin to pop up within a week or two, depending on the weather.
If you’re starting kale in trays, you can do this in a greenhouse, cold frame, or on a sunny windowsill. Use seed compost and keep the trays moist but not soggy. Once the seedlings have a couple of true leaves and are big enough to handle, you can plant them out into the garden. Choose a sunny or lightly shaded spot with fertile, well-drained soil. Before planting, it’s a good idea to dig in some compost or well-rotted manure to give the soil a nutrient boost.
When transplanting kale, make sure to space the plants well to give them room to grow. Around 45 centimetres between each plant is ideal. This helps ensure good air circulation, which reduces the risk of pests and diseases. After planting, water them in well and keep the soil moist during dry spells. Mulching around the plants with compost or straw can help keep the moisture in and the weeds down.
Ongoing Care
Kale is a low-maintenance crop, but it does appreciate regular watering and the occasional feed, especially if you're harvesting leaves often. A liquid organic feed made from seaweed or nettle tea every few weeks can give the plants a nice boost.
Keep an eye out for weeds, especially when the plants are young, as they can compete for nutrients and space. Once kale is established, it tends to outgrow most weeds and becomes easier to manage.
In the UK, one of the biggest challenges with growing kale is keeping pests at bay. Cabbage white butterflies love to lay their eggs on brassicas, and their caterpillars can quickly munch through leaves. You may also see signs of flea beetles, which leave tiny holes in the foliage. Pigeons are another common problem and will happily strip a kale plant down to its stalks if given the chance.
The best defence is a physical barrier. Covering your kale with fine mesh or netting from the moment you plant it out can stop most pests from getting in. Make sure the net is supported above the plants and secured around the edges so nothing can sneak underneath.
Harvesting
Harvesting kale is easy and very satisfying. You don’t need to wait for the whole plant to mature—just pick the outer leaves as you need them, starting when they’re about the size of your hand. Leave the central growing point untouched, and the plant will keep producing new leaves for many weeks or even months.
Regular picking encourages new growth, so don’t be shy about using your kale. You can continue harvesting well into winter, especially if you’ve planted hardy varieties like curly kale or cavolo nero.
If you want to extend your kale harvest even further, consider doing a second sowing in late summer. Seeds sown in July or August can grow into strong plants for autumn and winter picking. These later crops benefit from the cooling temperatures and usually suffer from fewer pest problems, especially once the butterflies have disappeared for the year. With a little protection, kale can even survive snow and freezing conditions, making it one of the most resilient crops you can grow.
I always grow an overwinter crop of Kale in my greenhouse along with some broccoli for a harvest when there is precious little else about.
Pots
Kale also does quite well in pots and containers, which is good news for those with limited space. Choose a deep container with good drainage, fill it with rich compost, and water regularly.
Container-grown kale may dry out faster than plants in the ground, so check the moisture levels often, especially in warm weather. You can harvest leaves in exactly the same way and enjoy a steady supply of greens right outside your kitchen door.
One of the great things about growing your own kale is how much better it tastes when it's fresh. Supermarket kale can be tough or bitter, especially if it’s been sitting around for a while.
Homegrown kale tends to be tender and flavourful, especially when picked young. It’s packed with vitamins, iron, and antioxidants, making it a healthy and delicious addition to your meals. You can steam it, sauté it, roast it, or blend it into smoothies—it’s a truly versatile crop.
In short, kale is a brilliant plant for UK gardens. It’s easy to grow, tough enough to handle our weather, and incredibly generous with its leaves. Whether you’re a first-time gardener or a seasoned grower, kale is always worth having in your plot. With a bit of attention and some simple protection from pests, you’ll be rewarded with one of the most productive and useful crops in your garden.
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