How and When to Prune Wisteria
Prune Wisteria regularly to keep the growth and size under control, and improve the flowering display. Although it seems complicated, pruning Wisteria is quite simple.
Summer Pruning Wisteria (July or August)
Cut back the whippy green shoots of the current year's growth to five or six leaves after flowering in July or August. This controls the size of the Wisteria, preventing it getting into guttering and windows, and encourages it to form flower buds rather than green leafy growth.
How to Prune Wisteria in Summer:
- At about two months after flowering, new shoots that are not needed or have grown in already crowded areas should be pruned.
- Cut them back to five or six leaves from the main branch, making the cut just above that leaf.
- If the plant has not reached the required size yet, tie any long shoots to wires or trellis.
Pruning Wisteria in Winter (January or February)
Cut back the same growths to two or three buds in January or February (when the plant is dormant and leafless) to tidy it up before the growing season starts and ensure the flowers will not be obscured by leaves.
How to Prune Wisteria in Winter
- In January or February shorten summer pruned shoots further.
- Cut them back to within 2.5–5cm (1–2in) of older wood, or 2 to 3 buds