Bulbs

Plant summer flowering bulbs such as Dahlias and Lillies.

Plant early potatoes in the ground or in large tubs for harvesting later in the season.

Potatoes

Protect new shoots of hostas and other perennials from hungry slugs and check tender new shoots for aphids so that you can remove them before the infestation gets out of hand

Pests

Hydrangeas

Cut back Hydrangeas before new too much growth starts. Cut back to a pair of healthy buds - this will usually take around a third of the previous years growth off.