The vegetable garden in winter is not empty, even if it looks it. Garlic is rooting underground, broad beans are standing in rows, kale and leeks are waiting to be picked, and brassicas are holding through frost after frost. Winter vegetable care is about keeping those crops alive and healthy, protecting the soil they grow in, and preparing the beds that are empty so they are ready for spring. It is a slower season than summer, but the work you do now decides how the vegetable garden starts in spring. This guide covers the crops, the protection, the watering and the jobs that matter in winter.
The first thing to accept is that winter vegetables grow very slowly, or not at all, in the short days. A kale plant in January is not growing the way it did in October; it is holding, waiting for longer days. That means you should not expect a winter vegetable garden to produce like a summer one, and you should not feed or fuss over plants that are dormant. The care they need is protection from the worst cold, enough water to keep them alive, and freedom from pests and diseases that thrive in damp, still winter air.
Overwintering vegetables
Garlic is the most important overwintering vegetable, and it is also one of the easiest: planted in autumn, mulched with straw, it roots through winter and grows away in spring. The main winter care is to check that the mulch has not blown away or become waterlogged, and to pull any weeds that appear on mild days. Our growing garlic guide covers the growing side, and the winter mulching guide covers the mulch that protects it. Broad beans sown in autumn in mild zones need similar care: protect them from hard frost with fleece or a cloche, and stake them if wind rocks them. In cold zones, autumn-sown broad beans are a gamble, and spring sowing is the safer choice.
Brassicas — cabbages, kale, Brussels sprouts, broccoli and cauliflower — are the hardy backbone of the winter vegetable garden. They tolerate frost, and many taste better after it. Their winter care is simple: keep them weeded, remove yellowing leaves that can harbour disease, check for pigeons, which can strip brassicas in winter when other food is scarce, and net them if birds are a problem. Our growing kale, growing cabbage and growing broccoli guides cover the crops, and the harvesting kale and harvesting cabbage guides cover picking them. Leeks and parsnips need little care beyond a mulch and occasional weeding; see our growing leeks and growing parsnips guides.
Watering in winter
Vegetables need far less water in winter than in summer, because growth is slow and evaporation is low. But they still need water, and winter wind and cold can dry soil surprisingly fast, especially in raised beds and containers. Water on a mild day, in the morning, so the soil has time to absorb it before night frost, and water the soil, not the leaves, because wet leaves in cold, still air encourage disease. Do not water when the ground is frozen, and do not water if rain is forecast. Raised beds dry out faster than ground-level beds in winter, so check them more often. The watering calculator gives a starting point for how much water winter vegetables need. If you are unsure how much water your soil needs in winter, check your local extension service for advice.
Protecting vegetables from frost
Frost protection for vegetables is practical and low-tech: fleece, cloches, cold frames and mulch. Horticultural fleece draped over a crop on a frosty night can make the difference between a crop that survives and one that is damaged, and it can be removed in the morning so the plants get light and air. A cold frame or low tunnel extends the season for salads and greens, and keeps rain off, which reduces disease. Mulch around the base of plants steadies soil temperature and stops frost heaving. Our winter frost protection guide covers all of these in detail, and the winter mulching guide covers mulch materials. None of these will save a tender crop such as a tomato or a courgette in winter — those are summer crops, and the honest plan is not to try to overwinter them outdoors in a temperate zone.
In zones 11 to 13, which are frost-free, winter vegetable care is different: winter is a growing season, and the care is watering, feeding and pest control, much like summer elsewhere. In zones 9 and 10, winter is a good season for cool-season vegetables, and frost protection is a matter of a light fleece on the coldest nights. In zones 1 to 4, winter vegetable care is mostly about storage: the crops are already lifted, and the garden is under snow. Frost dates vary even within a zone, so treat the ranges in this guide as averages and check your local extension service for your area.
Pests and diseases in winter
Winter does not kill all pests and diseases. Slugs and snails are active on mild, damp winter days, and they can damage young brassicas and overwintering salads. Check under mulch and boards, remove slugs by hand, and keep the garden tidy so they have fewer places to hide. Pigeons are a serious winter pest for brassicas, and netting is the reliable defence. Mice and voles can damage roots and bulbs under mulch, so keep mulch away from stems and check for runs. Clubroot, a soil-borne disease of brassicas, survives in soil over winter, which is why rotation matters — do not grow brassicas in the same bed year after year. Our clubroot guide covers the disease, and the slugs and snails control guide covers the most common winter pest. Remove yellowing and diseased leaves promptly, and do not compost diseased brassica material on a cool heap.
Empty beds in winter
Empty vegetable beds need care too. Left bare, they lose nutrients to winter rain, their structure is damaged by heavy rain, and weeds take hold. Cover them with a mulch of compost, straw or shredded leaves, or sow a cover crop such as winter rye or field beans if the bed will be empty for months. Our cover crops for soil and winter soil preparation guides cover both options. Do not dig empty beds in winter when the soil is wet or frozen: walking on wet soil compacts it, and digging wet clay destroys its structure. Plan the spring rotation now, while beds are empty and you can see them, and note what each bed grew last year so you can rotate properly. The planting calendar hub will help you line the plan up with your zone.
Harvesting through winter
Harvest winter vegetables on mild days, in the middle of the day when the ground has thawed a little, and handle them gently — frozen leaves bruise and rot. Pick kale and other greens leaf by leaf, outer leaves first, and leave the centre growing. Lift leeks and parsnips with a fork, loosening the soil first so they do not snap. Our winter harvesting guide covers the harvest in detail, including the honest limits in cold zones, where there is usually nothing to harvest outdoors in midwinter and crops should be lifted and stored before the freeze.
Common mistakes
The most common mistake is feeding winter vegetables that are not growing, which wastes fertiliser and can damage roots. The second is overwatering in winter, which encourages disease and rot. The third is leaving brassicas unnetted where pigeons are a problem, so they are stripped in a few days. The fourth is leaving empty beds bare all winter so rain and weeds take over. The fifth is digging wet or frozen soil, which damages its structure. The sixth is trying to overwinter tender summer crops outdoors, which wastes time and plants. And the seventh is ignoring slugs on mild winter days, when they can do real damage to young plants. If you are unsure about winter care for a particular vegetable in your area, check your local extension service for advice.
Frequently asked questions
Do vegetables need watering in winter?
Yes, but far less than in summer. Water on a mild day in the morning, water the soil not the leaves, and do not water when the ground is frozen or rain is forecast. Raised beds dry out faster than ground-level beds, so check them more often.
Should I feed vegetables in winter?
No, in most cases. Winter vegetables are growing very slowly or not at all, so they cannot use feed. Feeding is a spring job, when growth resumes. Compost spread as a mulch in winter feeds the soil slowly, which is different from feeding the plant directly.
How do I protect brassicas from pigeons in winter?
Net them. Pigeons can strip brassicas in a few days in winter when other food is scarce. Use a net held clear of the leaves on hoops or canes, so birds cannot peck through it, and check the net regularly.
Can I grow vegetables outdoors all winter?
It depends on your zone. In zones 9 and 10, cool-season vegetables grow through winter. In zones 5 to 8, hardy crops such as kale, leeks and parsnips hold through winter with mulch and fleece. In zones 1 to 4, there is usually nothing to harvest outdoors in midwinter.
What should I do with empty vegetable beds in winter?
Cover them. Spread a mulch of compost, straw or leaves, or sow a cover crop. Bare beds lose nutrients to rain, lose structure to heavy rain, and are taken over by weeds. Do not dig them when the soil is wet or frozen.