Oliver Pemberton
Planning for a Winter Harvest
Winter vegetables are a quiet triumph. While the rest of the plot looks bare and the seed catalogues tempt you with next year's tomatoes, a well-planned garden can still be offering parsnips, kale, leeks and fresh salad leaves straight through to March. The secret is not hardiness alone, but timing.
Most crops destined for winter plates need to be sown in the summer, while the soil is still warm and daylight is generous. If you leave it until October, seedlings simply will not size up before the cold arrives. Think of it this way: you are growing a mature plant in autumn that will then sit patiently, holding its harvest, until you need it in the depths of winter. Growth slows to a crawl in December, but a strong plant will shrug off frost and keep on giving.
Soil preparation matters more than ever. Fork in plenty of well-rotted compost in July and firm the ground gently — plants that are rocked about by winter wind and repeated freezing are far more likely to be lifted out of the soil and killed. If your plot is heavy clay, raised beds or generous amounts of organic matter will keep roots from sitting in waterlogged ground.
Reliable Crops for Winter Plates
Some vegetables are simply made for this job. They are worth the space they occupy because they stand in the ground for months without spoiling.
- Kale — 'Red Russian' and the tall 'Hungry Gap' will crop from October to April. Remove yellowing lower leaves and pick from the top.
- Cavolo nero — 'Nero di Toscana' is frost-hardy and its flavour actually improves after a cold snap, as starches turn to sugars.
- Leeks — 'Musselburgh' remains the benchmark for hardiness. Earth them up in late summer to blanch the stems.
- Parsnips — 'Tender and True' or 'Gladiator'. Leave them in the ground and lift as needed; frost sweetens them considerably.
- Winter cabbage — 'January King' and 'Winter Jewel' stand through the worst weather. Net against pigeons.
- Sprouting broccoli — planted out by mid-July for a purple or white flush from February onwards.
- Swede and turnip — 'Marian' swede sown in May or June will be ready for lifting from October. Store in a cool shed or clamp.
- Carrots — 'Autumn King' sown in late May can be mulched with straw and left in the ground, though slugs and carrot fly need watching.
Hardy Salads and Leafy Greens
Fresh leaves in January feel like a small miracle, and they are easier than most gardeners expect. Sow a winter salad bed in late August and early September, when the soil still holds plenty of warmth. Aim for plants that are sturdy but not oversized before the cold sets in.
- Lamb's lettuce ('Favor' is a good choice) — exceptionally hardy and productive in a cold frame.
- Land cress — peppery, reliable, and a fine substitute for watercress in sandwiches.
- Winter purslane (claytonia) — self-seeds freely and thrives in damp, shaded corners.
- Mizuna, tatsoi and komatsuna — fast-growing oriental greens that tolerate frost under cover.
- Winter lettuce — 'Winter Density' and 'Arctic King' will hold in a cold frame or unheated greenhouse.
- Spinach — 'Virtudes' or 'Winter Giant' sown in September for cut-and-come-again picking.
- Chard — 'Bright Lights' crops right through winter in most UK gardens, though growth stalls in the coldest weeks.
Sow these thinly and thin the seedlings to about 15cm apart for larger plants, or closer if you plan to cut baby leaves. A light dressing of balanced fertiliser in early autumn keeps them going without pushing soft, frost-tender growth.
Protecting Crops from Frost
You do not need a heated greenhouse. A few simple barriers make an enormous difference, especially for leafy crops. The aim is to keep the worst of the wind and ice off the foliage while letting light and air through.
- Fleece — a 17gsm grade is fine for light frosts, but a 30gsm horticultural fleece gives proper protection for lettuce and spinach. Lay it over hoops so it does not touch the leaves.
- Cloches — glass or polythene cloches warm the soil by several degrees and keep foliage dry, which reduces rot.
- Cold frames — ideal for salads and herbs. Prop the lid open on mild days to prevent damp and mould.
- Straw or leafmould mulch — a thick layer around parsnips, carrots and swede protects the crowns and makes lifting easier when the ground freezes.
- Windbreaks — a row of netting or a woven fence on the prevailing wind side stops plants being rocked loose.
Water sparingly in winter. Soggy, cold roots rot far more readily than dry ones, and most plants need very little moisture between November and February.
Growing in Containers and Small Spaces
You do not need a full allotment to eat from the garden in winter. A deep container of at least 30cm will support kale, chard or a single winter cabbage. Fill it with a good peat-free multipurpose compost and raise it onto pot feet or bricks to keep drainage free.
Windowsill herbs such as parsley, chives and mint will keep going indoors with reasonable light. A cool porch or unheated conservatory is perfect for a tray of cut-and-come-again salad, and it saves a fortune on supermarket bags of leaves.
Harvesting Through the Hungry Gap
The hungry gap — that lean stretch from late March to May — is when winter stores run out and spring sowings have not yet cropped. Plan for it deliberately. Sprouting broccoli, kale, leeks and the last of the stored roots bridge the gap beautifully, and a late sowing of land cress or mizuna will fill any holes.
Harvest little and often rather than stripping plants bare. Pick outer leaves from kale and chard, twist leeks from the ground as needed, and only lift roots when the weather allows. With a bit of forethought in summer, your winter plot will repay you with fresh, frost-sweetened produce when the rest of the garden is asleep.
