Check your plants for pests and diseases and deal with them promptly. Look out for mites and whitefly on the undersides of leaves and on stems, and aphids on buds, and caterpillars on or near brassicas. Small infestations of aphids can be pinched off, and larger colonies can be sprayed with natural insecticides. Better still, introduce natural predators such as ladybirds you can buy these through shops such as The Organic Gardening Catalogue, and for slugs and snails, try natural biologicals such as nematodes.
Repot any plants that will benefit from being in a larger pot; some
plants, such as bamboo and rhizomes, do better when their roots are
constrained. Take this opportunity to use a different kind of planter, if you want to give your garden a quick new look.
Liquid-feed container plants once a week; a seaweed or comfrey tea solution is best.
We can still suffer sudden frosts at night, so keep an eye on blossoming and nascent fruit trees, seedlings and tender plants; cover with cloches or fleece wherever possible to protect them.
Prune early-flowering shrubs and early clematis after they have flowered.
Look ahead to the time when your perennials will be heavy with flowers
and will droop, leaving open gaps in your border plantings. To avoid
this, stake young perennial plants now; choose supports that suit the
plants growth style: bamboo sticks for tall, straight plants, twigs for
Harden off plants that have been grown under cover; do this by bringing them out into the garden during the day only at this stage.