Beware of late frosts but remember it can also get quite hot. Apply mulch to keep the moisture in. Remove suckers from fruit trees. Spray roses and fruit bushes as required to keep aphids and caterpillars under control. Use grapefruit skins to catch slugs and snails. Remember to water new plants, shrubs, trees etc. 

Make sure all your hardy annuals are planted. May is feed time. Use a general purpose fertiliser but a rose fertiliser on the roses. Spread liberal amounts of compost around. Support tall perennials such as delphiniums and gladioli as they grow. Spray roses against greenfly.

Mow regularly. Apply a lawn fertiliser to your lawn.

Remove any blanket weed before it really gets going. Divide any plants that are too big. Plant up new aquatic plants.

The May sun can do untold damage to new plants. Check they are not getting excessively hot or dry. Plant your hanging baskets but hang them in the greenhouse to develop.

Frosts can still occur so be ready to protect new plants especially potatoes. Sow french beans, spinach, runner beans, beetroots, sprouts and cauliflowers. Put up poles for runner beans.

Houseplants do not like a draught. Regularly water all houseplants from now until the autumn.