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Pycnanthemum incanum

Common Name(s):
Hoary mountain mint, Hoary mountain-mint, Mountain mint
Herbs, Native Plants, Perennials, Wildflowers

Hoary mountain-mint, so called because of the hoary/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 tendancies.

Hoary Mountainmint is a herbaceous perennial that may grow 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.

Regions: Mountains, Piedmont, Coastal Plain

Seasons of Interest:

     Bloom: Summer, fall; Fruit/Nut/Seed: Fall

Wildlife Value: Hoary mountain-mint is highly deer resistant. Flowers are attractive to butterflies, especially smaller species like hairstreaks, and many other insects.

Summer into early fall
3-6 ft.
1.5 to 4 in. egg- to lance-shaped, toothed, opposite, stalked leaves with white down (hoary) below; square stems
Cluster of small, lobed, two-lipped, whitish to lavender flowers with small purple spots; hoary bracts below the flower. Blooms July to September.
Erect, many branched
Woods, thickets average, dry to medium, well-drained soils in full sun to part shade. Best flowering in full sun.
Rhizome rooting and self seeds easily
Full sun to partial shade
Life Cycle:
naturalize, showy flowers, weedy, drought tolerant, pollinator, butterflies, wildlife, fragrant flowers, showy

NCCES plant id: 2703

Pycnanthemum incanum Leaves and bracts
S.B._Johnny, CC-BY-SA-3.0
Pycnanthemum incanum Flower head
Tom Potterfield, CC BY-NC-SA - 2.0
Pycnanthemum incanum Pycnanthemum incanum
James H. Miller & Ted Bodner, Southern Weed Science Society, CC-BY-SA-3.0
Pycnanthemum incanum Pycnanthemum flower and leaf detail
Debbie Roos