Prune climbing roses
Climbing roses can be pruned once they have finished flowering; side shoots from the main branches can be cut back to a couple of buds. Any dead, diseased or spindly growth should be cut out and new young shoots tied into the supports, from the base. If there is an old, thick and woody, unproductive stem, it can be removed from the base to stimulate more vigorous growth.
Plant new perennials
This is a good time to plant new perennials, as the soil is still warm, but moisture levels are increasing.
Check tender plants for pests
When bringing plants indoors, check carefully for any pests and diseases they may have picked up outside, in particular, red spider mite, mealybug, and scale insect. Inspect rootballs and compost for vine weevil larvae and treat where necessary.
Clean greenhouse for winter
Cleaning the greenhouse is best done before bringing in all your tender plants for the winter. Pests and diseases can hide in tiny nooks and crannies, only to come back to life the following spring. Hose down the structure with a forceful jet of water, and then use safe cleaning products such as Citrox, and a non-abrasive scourer specifically recommended for cleaning glass.
Early sweet peas
Sow sweet peas in a cold greenhouse for early summer blooms next year.