September brings a mixture of summer and autumn harvests to UK vegetable gardens and allotments. Courgettes, beans and tomatoes may still be productive, while maincrop potatoes, carrots, onions and shallots are increasingly ready to lift.
Apples, pears, damsons, blackberries and autumn raspberries also make September an important fruit-harvesting month. As temperatures fall, the key is knowing which crops are ready, which can be stored and which are better left growing.
For a year-round overview, see our UK Harvest Calendar.
September Harvest at a Glance
September combines the final productive weeks of summer with mature maincrops, autumn fruit and vegetables suitable for storage.
| Crop group | What may be ready | September conditions |
|---|---|---|
| Late summer vegetables | Courgettes, French beans, runner beans, tomatoes, cucumbers, sweetcorn | Productive plants; outdoor crops increasingly weather-dependent |
| Maincrops, roots and alliums | Maincrop potatoes, carrots, beetroot, turnips, onions, shallots | Mature crops; check storage readiness |
| Autumn vegetables and greens | Celery, early leeks, chard, kale, calabrese, summer/autumn cabbage and cauliflower | Established plants and suitable varieties |
| Autumn fruit | Apples, pears, plums, gages, damsons | Check individual fruit for maturity |
| Soft fruit | Blackberries, autumn raspberries | Established fruiting plants |
| Herbs | Mint, parsley, chives, sage, thyme, rosemary, coriander, dill | Healthy growth; tender herbs increasingly weather-sensitive |
| Protected harvests | Peppers, chillies, aubergines, tomatoes, cucumbers | More dependable under cover |
| Conditional harvests | Mature early pumpkins, winter squash, swedes, figs, grapes, late strawberries | Suitable varieties and favourable conditions |
Sheltered gardens and greenhouses may continue cropping later than northern or exposed allotments. Check individual plants for maturity and keep an eye on the local weather forecast.
What Vegetables Can You Harvest in September?
Browse the crop groups below for September-specific advice, with links to the relevant harvesting or growing guides.
Healthy courgettes, beans and tomatoes can continue producing during September, particularly in mild weather.
Greenhouse cucumbers and tomatoes often crop longer than outdoor plants, while later sweetcorn may still be ready. Continue picking productive crops regularly, but monitor outdoor plants as temperatures fall.
September is an important month for lifting mature maincrop potatoes, alongside carrots, beetroot and turnips.
Onions and shallots may also be ready where their foliage has naturally yellowed and collapsed. Potatoes intended for storage should have firm, mature skins, while healthy onions and shallots need drying before storing.
Established celery and mature early leeks can provide useful September harvests, while chard and kale continue producing leaves.
Calabrese and suitable summer or autumn cabbage varieties may also be ready. Winter leeks and later brassicas generally benefit from remaining in the ground to develop further.
Fruit to Harvest in September
Apples, Pears, Plums and Damsons
September is a main harvesting month for UK apples and pears, although varieties ripen at different times.
Many pears are best picked when mature but still firm, allowing them to finish ripening indoors. Apples intended for storage should be handled carefully, with damaged fruit used promptly.
Plums, gages and damsons can also provide substantial September harvests from established trees.
For growing advice, see our How to Grow Apple Trees in the UK guide.
Blackberries, Autumn Raspberries and Late Fruit
Blackberries and autumn-fruiting raspberries can remain productive throughout September.
Figs and grapes may also ripen in sheltered gardens or under protection, while some perpetual strawberries and late blueberries continue producing smaller harvests.
Pick ripe fruit regularly and remove damaged or mouldy berries, particularly during wet weather.
For growing advice, see our How to Grow Raspberries in the UK guide.
Fresh Herbs and Protected Harvests
Fresh September Herbs
Established mint, parsley, chives, thyme, rosemary and sage can continue providing useful September pickings.
Tender basil becomes more vulnerable as overnight temperatures fall, while coriander and dill may still provide leaves or mature seeds from established plants.
Avoid cutting hardy perennial herbs back heavily as growth slows towards autumn.
Greenhouse and Polytunnel Harvests
Greenhouse tomatoes, cucumbers, peppers, chillies and aubergines may continue cropping throughout September, often remaining productive longer than exposed outdoor plants.
Shorter days and cooler temperatures gradually slow growth. Harvest ripe outdoor fruit before damaging frost, and bring sound, mature green tomatoes indoors to finish ripening if conditions deteriorate.
What Should You Harvest or Leave Growing?
September brings different harvesting decisions. Some crops are ready for immediate use, others have reached storage maturity, and many winter vegetables still need more time.
- Harvest now: Ripe courgettes, beans and tomatoes, mature maincrop potatoes, ready roots, onions and shallots, apples, pears, damsons, blackberries and autumn raspberries.
- Leave developing: Immature pumpkins and winter squash, celeriac, later swedes, winter leeks and Brussels sprouts that haven’t reached harvesting size.
- Not normally ready yet: Later-maturing apples and pears, quince and winter brassicas that haven’t reached harvesting size generally need more time.
Some early pumpkins and winter squash may already be mature. Fruit intended for storage should have a hard skin, developed colour and a sound stalk. Immature fruit may be usable for cooking but won’t necessarily keep well.
Early swedes may also be ready, while parsnips can often remain in the ground until colder weather improves their flavour.
Keep healthy summer crops productive while conditions allow, but monitor frost forecasts and harvest vulnerable produce before damaging cold weather arrives.
What to Do After Harvesting
As summer crops finish, clear spent plants and reuse available growing space for suitable autumn vegetables. For planting ideas, see our Vegetables to Plant in Autumn UK guide.
You can also use the Allotment Planner to organise cleared beds and plan replacement crops.
Prepare mature produce for storage by drying suitable onions and shallots, keeping sound potatoes in a cool, dark, dry, frost-free place, and selecting undamaged apples and pears. Use damaged produce promptly, and freeze, preserve or share surplus harvests while they’re in good condition.
Looking ahead? See What to Harvest in October UK for next month’s potential harvests.
FAQs: What to Harvest in September UK
Courgettes, runner beans, French beans, tomatoes, maincrop potatoes, carrots, beetroot, turnips, onions and shallots are among September’s main vegetables. Celery, early leeks and suitable autumn brassicas may also be ready.
Apples, pears, plums, gages, damsons, blackberries and autumn-fruiting raspberries are among September’s main fruits. Figs, grapes and some late strawberries may also be available in favourable conditions.
Yes. Many maincrop potato varieties are ready during September, although some remain in the ground until October. Potatoes intended for storage should have mature skins that do not rub away easily.
Some early varieties may be mature during September. Check for developed colour, hard skin and a sound stalk. Less mature fruit may be suitable for cooking but generally won’t store as well.
Mature early swedes can be harvested during September. Parsnips may also be usable, but they’re often better left in the ground until colder weather improves their sweetness, provided growing conditions remain suitable.
Prioritise ripe tomatoes, courgettes, cucumbers, beans, peppers, chillies and aubergines, along with tender herbs. Mature pumpkins and winter squash should also be brought in before damaging frost, particularly if they’re intended for storage.
