Hoary mountain-mint, so called because of the white appearance of the upper leaves and bracts beneath its flower clusters, is in the Lamiaceae family. It is an erect, many-branched perennial that typically grows 2-3′ tall on square stems like all members of the mint family. It can be used to help stop erosion, it is drought tolerant, and grows well even in dry soils. It roots by stems and self seeds easily, naturalizing in a landscape so be aware of its weedy tendencies.

Hoary Mountainmint is an herbaceous perennial that may grow to 5 feet tall. The stem is densely covered with short white hairs. The leaves are opposite with a toothed margin and white top. White or lilac flowers with purple spots first mature in mid summer and continue into early fall.