Pot up herbs so that they can be grown inside for use during winter. Continue to lift crops that have finished harvesting and clean up the beds. By now, green manures sown in late summer will be ready to be dug in to the soil. You can also sow over-wintering green manures now. Try and find a good source of farmyard manure if you don't have your own – cow, horse, pig, sheep and chicken manure are all great sources of nitrogen, phosphorus and potassium. If you are going to cover empty beds down with manure for the winter, the earlier you do it the better. October or early November is ideal.
You can sow hardy varieties of peas and broad beans later this month for an early spring crop but only do so in well-drained soil. In the polytunnel get a crop of cauliflower and carrots going over the winter. Plant selected varieties of garlic and winter onion sets (visit GIY online shop for varities) . The former will benefit from a good frost so it's traditional to plant before Christmas.
Depending on the weather, the harvest may well continue in to October – it's also a month when you are still harvesting many of the great autumn fruit and vegetables – pumpkins, squashes, courgette, apples, pears etc. It's the last hurrah however for peas, French and runner beans, tomatoes, cucumbers, aubergines, peppers and chilli-peppers. Continue to harvest wild mushrooms, elderberry, blackberries, apples, sloes, pears, peas, French and runner beans, tomatoes, cucumbers, aubergines, peppers, chilli-peppers, carrots, parsnips, swedes, celeriac, turnip, beetroot, potatoes, celery, marrows, pumpkins, squash, leeks, cabbage. Your root crops like carrots, parsnips, swedes, celeriac, turnips and beetroots, as well as your main crop potatoes should still be thriving. You can leave these in the ground for another while yet and use them as you need them, or lift and store if you prefer. Start to fall back in love again with old winter reliables such as chard and spinach. They will shortly become your very best friends.