To ensure a good display of flowers Wisteria needs to be pruned twice a year. Make sure that your secateurs are sharp to avoid crushing or tearing the stems, which may lead to die-back.
Winter Pruning – Between October and mid March cut back this season’s growth to two or three buds from the base. Cut at an angle just above the bud. This will encourage the development of spurs which carry the flowers in spring.
Summer Pruning – Between late June and Mid August but ideally in April or May cut back the long vigorous shoots that have been produced during late spring and early summer. Cut just above a couple of buds from the base. If the plant is young and still being trained, select some of the stronger shoots to tie into the frame and cut back to this framework.