●● Plant containergrown outdoor grape vines. ●● Divide hostas before they come into leaf. ●● When space becomes available in the greenhouse, pot up cuttings of tender perennials taken last summer. ●● Plant roses in heavy soils or in cold areas of the garden. ●● Protect new growth on lillies, delphiniums and any other plants affected by slugs and snails. ●● Remove dead leaves from around the basal rosettes of alpine plants to prevent rotting. ●● Plant all of those herbaceous perennials, including geranium, astrantia and Oriental poppies. ●● Sow sweet peppers, tomatoes, cucumbers, aubergines, celery, salads and globe artichokes in a frost-free greenhouse. ●● Remove any reverted green shoots on hardy, variegated evergreens. ●● Cut out the top rosette of leaves from stems of mahonia x media cultivars to encourage branching.