October is the time to prepare the polytunnel for winter. Clear tired summer crops, establish hardy plants and make sure frost protection is ready.
OCTOBER IN THE POLYTUNNEL: AT A GLANCE
Broad beans, cabbage, cauliflower, coriander, kohlrabi, peas, radish, spring onions.
Established crops from earlier sowings.
Aubergine, beetroot, cabbage, carrot, cauliflower, celeriac, celery, chard, coriander, courgette, cucumber, daikon, dwarf French and French beans, fennel, kohlrabi, lettuce, pak choi, pepper, radish, rocket, spinach, spring onions, strawberries, sweet potatoes, tomato.
OCTOBER IN THE POLYTUNNEL
If you have an empty spot or two, tender plants such as celery and fennel can be brought into the polytunnel and heeled-in, and if you’ve been caught out by the severity of the last couple of winters you might want to bring in a few leeks as well. While these are considered hardy plants, bouts of heavy frost will gradually kill them, layer by layer.
Broad beans and peas sown now should ideally be no higher than 30cms when cold weather ahead stops their growth. Then, if the weather gets cold enough for them to need some additional protection, they are still small enough to fit under fleece cloche hoops. Once the light levels increase in spring they’ll be off and running and should give you a nice harvest during the hungry gap.
Otherwise, there’s not a great deal of sowing to be done in October, so it’s a good time to clean up.
Local conditions matter: These are possible crops, not guaranteed harvests. Timing depends on the crop variety, earlier sowing dates, light, temperature and whether your tunnel is heated.
WHAT TO SOW IN OCTOBER
Broad beans, cabbage, cauliflower, coriander, kohlrabi, peas, radish, spring onions.
WHAT TO HARVEST IN OCTOBER
Aubergine, beetroot, cabbage, carrot, cauliflower, celeriac, celery, chard, coriander, courgette, cucumber, daikon, dwarf French and French beans, fennel, kohlrabi, lettuce, pak choi, pepper, radish, rocket, spinach, spring onions, strawberries, sweet potatoes, tomato.
ESSENTIAL POLYTUNNEL JOBS FOR OCTOBER
Tip 1
Clear up any debris to avoid unwanted guests overwintering in the polytunnel. Many pests become dormant during this time and would like nothing better than a cosy, undisturbed spot in the sheltered environment of your polytunnel, and as well as smaller insects this can also include rodents. With this in mind, don’t use the polytunnel as a storage shed – it’s far more useful as a growing area.
Tip 2
Sisal or jute growing strings can harbour mould and mildew through to the spring, so take them down and compost them.
Tip 3
Wipe all exposed surfaces with a mixture of bicarbonate (baking soda) and water, 10g to a litre, and add a few drops of Algon to help it stick to surfaces. Bicarbonate is a natural anti-fungal compound which will help give the polytunnel a clean start for the cold, damp months ahead.
Tip 4
As bare earth appears, dig in some compost. It’s better to use it now so that in can be incorporated into the earth rather than storing it until the spring.
Tip 5
The worst weather of the year is just ahead. Check now to see if you have any breaks or cuts in the polytunnel cover, especially around the doors. Clean the surrounding area first, then, when it’s completely dry, use polytunnel repair tape on both sides. Once the repairs are finished, wash the cover – even if you think it doesn’t really need it. You’ll be amazed at the difference it makes. Winter is the darkest time of the year, and your polytunnel plants will appreciate the difference a clean cover makes.
YOUR OCTOBER CHECKLIST
OCTOBER POLYTUNNEL GROWING FAQS
What can I sow in October?
The guide lists broad beans, peas, brassicas, coriander, kohlrabi, radish and spring onions. Growth will depend on local light and temperature.
Should I remove summer crops?
Remove declining plants when they take up space needed by winter crops; a healthy, productive plant may be worth keeping a little longer.
Find individual crop advice in our Top of the Crops guide, or browse all monthly growing guides.
