Lightly rake lawn if mild and not waterlogged to remove moss & repair any damage.
Remove any dead, diseased or damaged growth from trees and shrubs.
Finish mulching if not done in autumn.
Put manure/rose feed around all roses and check for dead, diseased or dying shoots.
Deadhead bulbs regularly.
Plant new perennials and summer-flowering bulbs.
Re-pot or top-dress all containers.
Weed regularly.
Edge / define all borders.
Plant roses.
Sow hardy annuals for summer colour.
Harden off hardy annuals sown under glass.
Cut back any remaining growth from herbaceous / grasses leftover from the winter.
Divide summer-flowering perennials like Astrantia.
Vegetable Garden:
Prune gooseberries and red and white currants. Remove deadwood and then spur prune all side shoots back to 2 – 3 buds from the base. Shorten branch tips by one quarter.
Plant shallot and onion sets.
Harvest the last of the winter crops and compost any un-diseased debris.
Sow aubergines, cucumbers, tomatoes and chillies in an indoor heated propagator but only if you have a heated glasshouse for growing on seedlings.