Trim wisteria

after flowering to keep the rampant growth tidy over summer; cut the side branches back to about 30cm from the main stem. Then in winter, after the leaves have fallen, shorten them further so that three or four plump flower buds remain on each. If you want your wisteria to grow longer remove basal suckers right back to the main stem after flowering. Or to put the brakes on an over rampant vine, leave the suckers on until winter before pruning them out.