Pep up shrubby herbs
Hard-prune shrubby herbs such as sage, cotton lavender (Santolina), bay and rue. This will encourage vigorous new growth and side-shoots. Trim old stems from marjoram and savory, if not already done. Prune lavender into shape, taking care not to cut into the old wood. Offcuts can be used as softwood cuttings. Old, woody plants are best removed.
Be vigilant over pests
Pest populations usually start to increase dramatically now. Be vigilant and don’t allow infestations to build up. Use organic treatments, such as insecticidal soap, to control problems until the temperatures are warm enough for biological controls to be introduced.
Grow perennials from seed
Sow perennials in modules or small pots. Prick out once leaves are large enough to handle. Plant out when well-established. Some perennials may flower this year, others will take longer.
Encourage more flowers on climbing roses
As climbing roses send out shoots, pull them down to the horizontal. This will encourage flowering shoots to emerge all along the stem.
Prepare half-hardy perennials
Pot on dahlia and begonia tubers and pinch out tips of fuchsias and other half-hardy plants.