When to prune Amethyst Falls American wisteria?

2 months ago
last modified: 2 months ago

After years of letting it go wild with few blooms, last year my husband hard-pruned our 20-year-old American wisteria with good results (pic). But we can't remember when he did it, or how. Right now, there is a final flush of a few blooms and seed pods. Is this the time? And what gets lopped? Many thanks.

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