Summer prune Wisteria by cutting back any long, whippy, that were produced this year, to 5 or 6 leaves from the base. This will help to develop the short flowering spurs that will crry next years flowers.
Plum, cherry, and damsom trees are best pruned directly after harvesting. Cuts will heal rapidly in the warm weather and the risk of infection from silver leaf fungus is reduced.
Many plants benefit by being put outdoors for a few weeks, away from the extreme heat of a conservatory in high summer.
Take cuttings of mint, thyme or sage to get new plants and also sow dill, coriander and parsly direct to keep supplies coming.
Encourage more blooms, whether in your beds, borders, containers or hanging baskets by dead heading often. Feed regularly with liquid seaweed or a high potassium fertiliser.
Keep tomato compost constantly moist and feed according to fertiliser instructions. To help avoid fruits suffering from blossom end rot and splitting.
Now is the time to plant autumn flowerring bulbs such as Colchicum, Sternnergia, and Nerine.
Continue to harvest summer fruiting raspberries. Once fruiting has finished cut out old fruited canes to ground level and tie in new healthy canes to supports 10cm apart.
Onions are ready to harvest once the foliage turns yellow and starts to fall over, Carefully ease the bulbs out of the ground using a garden fork and dry them in the sun before storing. Do not store any that have bolted (producing flowers).
Stop harvesting rhubarb. This will allow the plant to return energy to its roots for next years crop.