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Pycnanthemum flexuosum (Appalachian mountain mint)
Species Distribution Map: Click to enlarge
Map Color Key © 2013 BONAP

Pycnanthemum flexuosum

Appalachian mountain mint

(syn. Koellia hyssopifolia)

Diminutive cousin to P. muticum, great in helping with soil erosion
Resistant to deer browsing
Aromatic, summer/fall blooming perennial with cool, fuzzy white flowers
Larval host for the Gray Hairstreak butterfly
Spreads via rhizomes
Dry-moist, well-drained soil
Fragrant foliage takes on red tinge along margin

An aromatic, summer blooming, herbaceous perennial that produces silvery white, globular flowers on sturdy, upright stems. Blooming over a long period, flowers are prominently displayed above clean green foliage summer into fall. A good soil stabilizer, this species spreads via underground stems, but won’t take over the garden! Foliage develops an attractive red tinge in autumn. A larval host plant for the Gray Hairstreak Butterfly; incorporate along the perennial border, rain garden, or near the vegetable garden to entice pollinators.

Pycnanthemum flexuosum LP50 - 50 per flat $56.70
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2-3 Feet


3-4 Feet


12 Inches

Bloom Color


USDA Hardiness Zone 6(5b)-8

Appalachian mountain mint Interesting Notes

P. flexuosum is clump-forming and spreads slowly via underground runners - it won't take over the garden like other mints!

Key Characteristics & Attributes

Deer Resistant
Deer Resistant
Full Sun
Full Sun
Part Sun
Part Sun

Additional Information

Soil Moisture Needs
Plug Type
Landscape Plug™
Propagation Type
Erosion Control
Native to North America