When planting, incorporate some well-rotted garden compost into the planting hole and dust the rootball with mycorrhizal fungi. Position the wisteria 30cm (12in) away from the supporting structure and then angle the plant towards it. In the first growing season, keep the climber well watered, especially during warm, dry periods. To encourage flowering, prune the twining stems twice yearly: once in summer (about two months after the flowering has finished) and again in mid-winter. In summer, cut back the wispy stems on both the laterals and sub-laterals (the side shoots from the laterals) to about five or six buds from the main branches. In winter, cut back these stems even harder to within two or three buds of the main branches. These form the short spurs that will go on to produce flowers in the following spring.