When to Plant Autumn Vegetables
Autumn vegetables are planned well before autumn arrives. Some are sown in spring or early summer for harvesting later, while others are sown in summer to fill empty beds with quick, cool-weather crops. Use your local weather, daylight and available protection to turn the late season into a useful growing period.
Separate autumn crops into two groups before you sow. Maincrop brassicas, leeks, parsnips, swede and winter cabbage need a long lead time, often beginning in spring. Salads, rocket, radishes, spinach, spring onions and some oriental leaves can be sown later to harvest in autumn. Read every packet, then count backwards from the likely slowdown in growth at your location. Gardeners in the mild south may sow later than those in northern England, Wales or Scotland, where shortening days and cool nights arrive sooner. A polytunnel, greenhouse, cloche or fleece can extend the useful season but cannot replace daylight.
For long-season autumn harvests, sow leeks, Brussels sprouts, winter cabbage and purple sprouting broccoli in spring, usually in module trays of peat-free seed compost or a prepared seedbed. Transplant young plants while they are sturdy but not root-bound, watering them in thoroughly. Parsnips and swede are normally direct-sown in spring or early summer because they need time to develop before cold weather. Give brassicas firm soil, adequate spacing and protection from pests. These crops reward early planning: by late summer their job is mainly watering during dry spells, weeding and checking that supports or netting remain secure.
Use beds cleared by early potatoes, garlic, broad beans or summer salads for late sowings. From July into August, direct-sow rocket, radish, spinach, spring onion and hardy salad leaves in short drills, making a further small sowing if space allows. In a cool region, aim for the earlier end of that period. Cover new sowings with fleece or a cloche when nights become cool, and keep the soil evenly moist until seedlings emerge. Thin crowded seedlings promptly. Late crops grow more slowly as days shorten, so avoid sowing a whole packet and expecting it all to mature before winter.
Raise some autumn plants in module trays to make better use of small gaps. Sow lettuce, winter salad, kale and chard in peat-free compost, then transplant them after another crop has finished. This avoids losing time while a bare bed waits for direct-sown seed to germinate. Water modules well before planting and transplant on an overcast day or in the evening where possible. Firm each plant carefully and protect it from slugs from the start. In a greenhouse or polytunnel, containers of salad leaves can provide extra autumn harvests without taking space from tomatoes or other tender crops until they are cleared.
Prepare soil simply and avoid overworking it. Remove spent crops and obvious weeds, then spread a thin layer of well-rotted manure or garden compost where a hungry crop will follow. Rake the surface to a fine tilth for small seed, but leave heavier soil alone if it is wet and claggy. Water before sowing if summer drought has hardened the ground. As autumn approaches, clear fallen leaves from small seedlings so they are not smothered. Use cloches and fleece on cold nights, lifting them on mild days to allow airflow and prevent damp, stale conditions around plants.
Harvest little and often, especially from salads, rocket, chard and kale. Pick outer leaves first and leave the central growth intact. Root crops can remain in the ground when soil is free-draining, but lift them before prolonged waterlogging or severe freezing becomes likely. Keep beds tidy by removing yellow leaves and checking covers after wind. If a sowing is too late to become a full crop, treat it as soil cover or young leaves rather than a disappointment. Record successful sowing dates by month, because your own plot's shelter, elevation and soil warmth are the best guide for next year.
Frequently asked questions
What can I sow in August for autumn harvests?
August is useful for quick crops such as rocket, radishes, spinach, spring onions and hardy salad leaves, particularly in mild districts. Sow earlier in the month in cooler areas. Use fleece or a cloche as nights cool, keep soil moist for germination and choose varieties described as suitable for late-season growing.
When should I plant winter cabbage?
Winter cabbage is usually sown in spring and planted out in early summer, so it can build a substantial plant before autumn. Exact timing varies by variety and region. Give plants firm soil, generous spacing and regular watering while establishing, then protect them from pests throughout the growing season.
Can I grow autumn vegetables in containers?
Yes. Containers are excellent for salads, rocket, spinach, radishes and spring onions near the kitchen door. Use fresh peat-free multipurpose compost, water consistently and raise pots where slugs are troublesome. Move them into a sheltered position or greenhouse during cold snaps, while keeping enough light and ventilation.
General guidance for UK home gardens and allotments. Conditions vary by region, soil and season; the RHS or a local garden centre can give site-specific advice. Page updated 19 Sep 2026.