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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)

Great in helping with soil erosion
Resistant to deer browsing
Aromatic, summer-to-fall blooming perennial
Cool, fuzzy white flowers
Larval host for the Gray Hairstreak butterfly
Clump-former that spreads slowly via rhizomes
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 from summer into fall. A good soil stabilizer, this species spreads moderately via underground stem. 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.

SIZE
Pycnanthemum flexuosum LP50 - 50 per flat Availability
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Height

2-3 Feet

Spread

3-4 Feet

Spacing

12 Inches

Bloom Color

White

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! A soil stabilizer that is great for slopes and streambanks.

Good Substitutions

slender mountain mint Pycnanthemum tenuifolium
short-toothed mountain mint Pycnanthemum muticum

Key Characteristics & Attributes

Full Sun
Full Sun
Part Sun
Part Sun
Moist
Moist
Summer
Summer
Deer Resistant
Deer Resistant
Pollinator-friendly
Pollinator-friendly
Fragrant
Fragrant
Cut Flower
Cut Flower

Additional Information

Soil Moisture Needs
Well-Drained
Average
Dry
Plug Type
Landscape Plug™
Season of Interest (Flowering)
Late Summer
Fall
Green Infrastructure
Woodland
Bioretention/Rain Garden
Meadow/Prairie
Attributes
Native to North America
Propagation Type
Vegetative