Purple‑stem angelica is a bold, moisture-loving perennial that features deep purple stems topped with large, umbrella-like clusters of greenish-white summer flowers that attract bees, flies, and butterflies. It is clump-forming rather than aggressive, and it works best in larger naturalized plantings, at the back of borders, or in areas where it has room to provide architectural height. It prefers rich, moist soils can tolerate periodic flooding while adding both dramatic visual interest and strong pollinator value.