Winter-February cut back shoots to three to five buds. Over the past 30 years Iâve had to twice cut my wisteria way back for fence repairs. Dont know if it will confuse but we have had one for 12 years and we remove all the whips around september , cut them right back. Hard pruning. Judith UrsulaV June 13, 2011 at 2:53 pm. Pruning Mature Wisteria Plants. The pruning cut is immediately above a bud. If your Wisteria is a more mature plant, February pruning keeps its size in check. They will bloom in spring like before. Unfortunately due to building work I'm going to need to cut the Wisteria right back, so it's no more than about 0.75m tall, which means I'm only going to be left with a stump. Older plants tend to be more robust and rigid than a little wisteria plant thatâs just starting its journey, for example. Thatâs where hard pruning comes in. A wisteria side shoot - lateral, ready to be cut back hard in late winter pruning (Jan/Feb). It's about 3m tall by 10m wide. Tie in new stems to fill gaps if necessary. But for the gardener who has limited space and wants to enjoy more visible and abundant wisteria flowers, a pruning routine becomes a necessary chore. Next summer you will be back in business. Wisteria can live a long, healthy life with no pruning at all, happily twining, climbing, and sprawling over everything in its path. Always cut stems back to a main branch, pruning just above a strong young shoot lower down, and aim to leave a well-spaced frame of stems covering the desired space. Then when all the leaves have dropped off about february, you get a clearer view of the plant. The lateral - having been cut back to 3 buds from the main branch leader. Hard pruning is more severe and requires an enormous amount of effort. So I was wandering around the front yard, fertilizing the Celandine poppies, and ⦠After pruning wisteria, you will find that your wisteria trimming may have caused some larger branches to die back⦠Cut back new growth and main branches to just two or three buds to keep the plant neat, tidy and ready for the forthcoming growing period. Wisteria is a very tough plant! Wisteria is very resiliant. In summer, itâs almost the same, except that youâre cutting off five or six leaves per shoot. Every shoot then prune back to the first pair of buds. Cut it back to where you need to, replace your trellis and it will be growing again in no time. Summer-July or August cut back shoots to 10-12â, this helps get sunlight to wood. It really does grow back! I have 2 huge mounds of wisteria in my front yard - am going to prune them back hard to cut down on the size. If you donât have a wisteria and want one, Wisteria sinensis âProlificâ is ⦠Hi - we have a lovely mature Wisteria with a thick trunk. 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