How to Prune gravel root?
Cut back at the end of the season

gravel root · Eutrochium purpureum
Also known as: grass root; gravel weed; hardy ageratum; Indian gravel root; Indian sage; Indian sanicle; Joe Pye weed; kidney root; kidney wort; marsh milkweed; motherwort; pride of the meadow; purple boneset; purple hemp agrimony; queen of the meadow; queen of the prairie; quill wort; sisters of healing; skunkweed; sweet-scented joe-pyeweed; trumpet weed
Grow in any moist soil in full sun or partial shade
Cut back at the end of the season