How to prune montgomery astilbe

Late autumn to early spring for full cutback; deadhead after flowering if desired. Cut spent flower plumes back to the base after blooming, or leave them for winter interest. In late winter or early spring, use shears or secateurs to cut the entire clump to ground level before new growth appears.

Once annually (cutback); deadheading optional. Montgomery Astilbe needs minimal pruning. Deadhead spent plumes once they fade if you prefer a tidy look, though many gardeners leave the russet-brown plumes standing through winter for structure and wildlife interest. Cut the whole clump to ground level in late autumn or early spring before new growth emerges.

Cut spent flower plumes back to the base after blooming, or leave them for winter interest. In late winter or early spring, use shears or secateurs to cut the entire clump to ground level before new growth appears.