What can I plant in September?
(UK Gardening Guide)
September is a bridge month: harvests are still coming, but cooler nights mean growth slows. Focus on overwintering crops, protect brassicas from birds and start covering empty beds to keep soil in good condition for next year.
What can you sow in September?
September sowings are about overwintering. Choose hardy leaves that can sit through cold weather and give early pickings in spring.
If you have spring cabbages ready, plant them out now and cover with netting. Pigeons can shred brassicas quickly as other food sources disappear.
Keep soil covered where possible — with crops, mulch or green manures — to reduce nutrient loss and protect structure.
Vegetables to sow indoors or under cover
Winter lettuce (modules or trays)- Oriental leaves (under cover in cold spots)
Vegetables to sow or plant outdoors
- Spinach (hardy varieties)
- Winter lettuce (mild gardens)
- Overwintering onion sets (free-draining soil)
- Spring cabbage (plant out and net)
- Green manures (cover bare beds)
Tip: Net brassicas early. Once pigeons discover a bed, damage can be rapid.
Sproutly Gardening tip: Use Sproutly to plan overwinter beds and set reminders for netting checks and greenhouse ventilation on warm days.
September gardening tips and common mistakes
September is a great time to set up next year’s early crops. The main pitfalls are leaving things too late and forgetting protection as the weather turns.
- Not netting brassicas
Pigeons can strip leaves quickly. Use netting or mesh to protect cabbages and other brassicas. - Sowing too late for useful growth
Growth slows fast as days shorten. Prioritise hardy leaves and sow promptly so plants establish before winter. - Leaving beds bare
Bare soil loses structure and nutrients. Mulch, sow green manures or keep beds planted to protect soil. - Composting diseased material
Blight and other diseases can persist. Remove infected debris from the plot and dispose of it safely. - Skipping storage prep
Cure pumpkins and winter squash in a warm, dry spot before storing, and keep them dry to prevent rot.
Sproutly Gardening tip: Record overwinter sowing dates and locations in Sproutly so you can rotate beds and improve results next season.
Garden planning and task management features
Sproutly Gardening helps you organise your plants, plan tasks and set reminders so nothing is forgotten.
Record your sowings
Track overwinter sowings so spring planning is easy.
Plan upcoming jobs
Schedule netting checks, mulching and clearing beds.
Set reminders
Remember frost protection and ventilation on sunny autumn days.
Review your progress
Note which September crops overwintered best.
Plan a strong autumn and winter. Use Sproutly Gardening to organise overwinter beds and protection tasks.
Gardening advice is provided as a general guide based on typical UK conditions. Weather soil and local climate can vary so always use your judgement and adjust timing as needed for your own garden.