Rhizomes should be lifted in fall for overwintering. Plant rhizomes 4-6” deep and 18-24” apart in spring after threat of frost has passed. Remove entire flowering stems immediately after bloom. In fall, cut plants to the ground after first frost and lift rhizome clumps for winter storage in a dry medium (peat or vermiculite) in a cool dry location than does not fall below 40°F. Rhizomes may be occasionally sprayed with water in winter to make sure they do not become so dry that root shriveling would occur.
Height: 1.5-8 ft.
Spread: 1.5-6 ft.
Bloom time: July to August
Sun: full sun
photo credit: Sabina Bajracharya