Certain plants, like yarrow, catmint, thyme, lavender, and climbing hydrangea, will benefit from late-summer pruning as a way to encourage more blooms.
15 Perennials You Should Prune In August To Enjoy Another Wave Of Blooms

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Certain plants, like yarrow, catmint, thyme, lavender, and climbing hydrangea, will benefit from late-summer pruning as a way to encourage more blooms.