If you want to get the best out of your wisteria and enjoy a fine display of its beautiful racemes of pea-like flowers in May and June, a two-stage pruning regime is recommended for established plants. The first stage should be carried out in July or August and involves tackling the mass of long, whippy lateral growths that have been produced by the plant in the current season. These growths should be pruned back to within 15cm, or five or six buds, of a main branch, thereby restricting the vigour of the plant whilst maintaining good leaf cover for the remainder of the summer. The second stage of pruning should be carried out in the winter, in January or February. All of the lateral growths pruned in the summer of the previous year should now be shortened to within two or three buds of their base, in order to produce the spurs that will bear flowers in the current season.
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