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When to prune wisteria

Summer (shorten whips) and late winter (spur back). Twice-yearly pruning creates flowering spurs and controls size.

Typevine
Blooms onold wood (spurs)
Bloom seasonspring
When to pruneSummer (shorten whips) and late winter (spur back)
StopNo heavy pruning in the 6–8 weeks before your first fall frost

Also

Asian wisterias are invasive in many states.

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Sources

Summarized in our own words from public extension publications.

All pruning timing