Eutrochium fistulosum (Barratt) E.E.Lamont
Hollow Joe-Pye Weed, Trumpetweed, Purple Thoroughwort
Eupatorium fistulosum (basionym), Eupatorium fistulosum f. fistulosum, Eupatorium purpureum var. angustifolium
Bloom Time: Mid-summer to early fall
Eutrochium fistulosum is an erect, clump-forming perennial which typically grows up to 7 feet (2.1 m) tall and features coarsely-serrated, lance-shaped, dark green leaves up to 12 inches (30 cm) long in whorls of 4 to 7 (frequently 6) on sturdy green stems which are hollow. Tiny, vanilla-scented, dull pinkish-purple flowers in large, terminal, domed, compound inflorescenses, bloom in mid-summer to early fall.
USDA hardiness zone 4a to 9b: from −30 °F (−34.4 °C) to 30 °F (−1.1 °C).
How to Grow and Care
Sweet Joe Pye Weed is happiest with full sun to part shade in moist to wet soils. It prefers that the soil does not dry out which is why clay works well for Joe Pye. It has no serious insect or disease problems.
Sweet Joe Pye Weed just isn't a fussy or difficult plant to grow. If you do not want Sweet Joe Pye Weed to spread hither and yon, then cut the seed heads off.
If you are propagating by seed in the fall, then plant thickly as germination is usually low. Propagation is best from softwood cuttings taken in late spring or by division in fall as they go dormant, or in the spring just as shoots first appear… – See more at: Growing and Using Sweet Joe Pye Weed
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