September

Tree fruit

• It's your last chance to prune stone fruit (such as nectarines, apricots, peaches, plums, gages and damsons). Do so immediately after harvest.
• Finish tying in shoots on wall-trained fan trees.

Soft fruit

• Order cold stored strawberry runners for delivery in winter.
• Continue planting new strawberry beds.
• Cut back old canes of blackberries and hybrid berries after fruiting and tie in the new canes.
• Prune blackcurrants.

Vine fruit

• Spur prune kiwifruits after harvest.

General

• Order new fruit trees, canes and bushes.
• Continue to provide support for heavily-laden fruit tree and bush branches.

Sowing and planting

• Continue to sow vegetables for overwintering, to mature next spring, including: turnip, spinach, winter lettuce, Oriental vegetables and seed of overwintering onions - both salad and bulb types.
• Plant overwintering onion sets.
• Spring cabbages that were sown last month are probably ready for planting out. Cover them with horticultural fleece or netting to stop the pigeons shredding them.
• Sow green manures such as crimson clover and Italian ryegrass to act as a soil improver and to cover bare areas. When dug in, they conserve nutrients and improve soil texture.

General care

• When asparagus foliage turns brown, it is time to cut it down. Take care of the spines, and give the plants a good mulch afterwards.
• Irregular watering can lead to problems with blossom end rot in tomatoes, splitting of root vegetables and flower abortion in runner beans. Help prevent this by watering well during dry spells.
• Keep up too with watering winter squash and pumpkins -  this will prevent their growth from being checked. Use stored rainwater wherever possible.
• Celery can be earthed-up for the final time this month, leaving just a tuft of foliage sticking out of the trench or collar in order to blanch the stems.