Renowned horticulturist Monty Don has shared an essential gardening task for wisteria that must be done now to ensure the best possible blooms next year. The BBC Gardeners' World presenter, known for his expertise and his magnificent private garden Longmeadow in Herefordshire, advises that a straightforward summer prune is crucial.
Why Prune Wisteria Now?
Wisteria produces its flowers on new growth that emerges from spurs off the main shoots. According to Don, the best time to prune is when the plant has finished flowering, typically around mid-June for most UK gardens. He explains: "Wisteria produces its flowers on new growth, which in turn emerges from spurs off the main shoots. When they have finished flowering - and for most of us that is around the middle of June - is the best time to prune all this year's new shoots back to a spur, leaving no more than about 6 inches of growth."
This pruning not only encourages next year's blooms but also helps tidy and train the plant. Don adds: "In the process the whole plant can be tidied, trained and tied in so that there are no loose, trailing shoots."
How to Prune Wisteria Correctly
The key task is to cut back all new growth to six inches (about 15 cm). For those unsure about how hard to prune, Don offers straightforward advice: "If there is any doubt about how hard to prune, err on the side of cutting too lightly and then in the new year, when the foliage has all died back, you can prune again, reducing each side shoot to just 2 or 3 inches."
Wisteria typically flowers between April and June, with blooms in deep purple, pink, lilac, or white. A proper summer prune can also stimulate a second flowering, or "flourish," in late summer (July and August).
Impact on Garden Aesthetics
Cultivating wisteria is a guaranteed way to transform an outdoor space into a storybook setting. The cascading blooms add vivid colour and a sense of wonder to gardens and properties. By following Don's advice now, gardeners can ensure their wisteria delivers spectacular displays year after year.
