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Mow lawns regularly now, but think about leaving some areas long for wildlife and to encourage flowers to bloom. Reseed bare patches or lay turf. Tie in climbing and rambling roses, sweet peas and clematis as they climb. Summer bedding can be planted out towards the end of the month.

[Read more…] about Wellie’s Gardening Tips for May 2025

Check roses for blackspot, remove any infected leaves and treat with a fungicide. Sow hardy annuals and wildflowers in gaps in the garden. Feed borders with a general purpose fertiliser such as Growmore and mulch with compost or well rotted manure.

Plant summer bulbs such as alliums, eucomis and lillies. Cut back Penstemons now. Take a close look before pruning, some produce a mass of new shoots at the base of the plant, so old stems should be cut back close to the soil.

When new growth is visible only along the stems, trim them to 15-20cm from the ground, just above a shoot.

To encourage bushy growth on Marguerites, Pelargoniums and Fuchsias in the greenhouse, pinch out the tips. Spray weeds on driveways and paths this month when they are actively growing. Use a spring/summer feed on the lawn (it should be high in nitrogen to encourage strong leafy green swards) Carry on sowing vegetables directly into prepared soil including carrots, turnip, peas, broadbeans, spinach and lettuce. Sow tender courgettes, cucumbers and pumpkins in a heated propagator or sunny window sill.

Plant out autumn sown sweet peas.