How to prune mountain phlox

After flowering in late spring to early summer; tidy in autumn. Snip off spent flower stalks at the base of the stem. Use shears to lightly trim the edges of spreading mats if they outgrow their space. Cut the whole plant to ground level in autumn.

Light deadheading post-bloom; annual autumn tidy. Mountain Phlox is a compact, mat-forming native perennial that needs very little pruning. Remove spent flower stems after the spring-to-early-summer bloom to tidy the plant. A light trim of any untidy edges of the foliage mat can help maintain shape. Cut to the ground in late autumn.

Snip off spent flower stalks at the base of the stem. Use shears to lightly trim the edges of spreading mats if they outgrow their space. Cut the whole plant to ground level in autumn.