Zones: 3 to 7
Size: 1 to 3' tall
Exposure: Sun, Filtered Sun, Part Shade
Tall stems with flat-topped clusters of greyish-white flowers in summer. Leaves opposite, long and pointed.
'Snowball' - white flowers
Published in Phytologia 19: 212 in 1970.
Native to the US and Canada.
Previously placed in the genus Eupatorium.
Basionym Ageratum altissimum.