September is also a good month to think about planning your way through the next season and there are a few things that can be sown now to help you through the sparse winter months. Good planning and sowing now can also help make that hungry gap (between February - May) a little bit more bountiful.
Here's a few September sowing suggestions:
Cabbages (for spring hungry gap)
Kale (if you sow in the next week or so)
Onions (from seed or bulbs)