The weather in September is often warm, so you'll need to keep watering.
It's a time when you might have gluts of certain crops - find out about preserving your harvests.
Here are some jobs you can get on with on the allotment in September.
Now is time to start sowing the vegetables that will provide valuable winter harvests and earlier spring and summer pickings. You can sow leafy veg such as spring cabbages and spinach, winter salads, broad beans and peas for earlier harvests next spring, onions, shallots and garlic, and quick-growing crops such as turnips and radish.