Eutrochium fistulosum (Eupatorium fistulosum), also called hollow Joe-Pye weed,[3] trumpetweed,[3] or purple thoroughwort,[4] is a perennial North American flowering plant in the family Asteraceae.

Eutrochium fistulosum is a herbaceous perennial plant sometimes as much as 350 cm (140 in; 11 ft 6 in) tall.

It is found in moist, rich soil alongside ditches and marshes, or in wet forests.

[8] The plant has one simple erect stem, which is green with purple dots or longitudinal dashes and can grow over six feet tall.

Leaves and primary subdivisions of the flower head appear in whorls of 3–5 (rarely 2 or 6, the rotational symmetry of most plants is consistent).