What to plant in September

September: harvest peaks and planting season for next year begins. Sow green manures, plant spring bulbs, and divide herbaceous perennials.

What to sow in September: Hardy winter lettuce; Spring cabbage (transplant); Overwintering onions and garlic (end month); Green manures: field beans, phacelia, rye.

What to plant in September: Spring bulbs: daffodils, crocus, alliums; Strawberry plants; New perennials and shrubs (ideal soil moisture); Autumn onion sets.

What to harvest in September: Apples, pears, plums; Maincrop potatoes; Pumpkins and squash; Sweetcorn; Tomatoes (under cover for longer); Runner and French beans.

Key jobs for September: Divide overgrown herbaceous perennials; Clean out greenhouse before winter use; Net ponds against falling leaves; Sow a new lawn or repair bare patches; Bring tender plants under cover before first frost.