Pycnanthemum tenuifolium
Pycnanthemum tenuifolium narrowleaf mountainmint


Narrowleaf mountainmint is a native herbaceous perennial known for its pollinator-attracting clusters of small white flowers and minty leaves, which are used in herbal teas and as a seasoning. When rubbed on the skin, the leaves can help repel biting insects. The small white flowers grow in clusters that resemble outstretched fingers, drawing in butterflies, bees, moths, skippers, beetles, and wasps. Slender, needle-like leaves, one to two inches long, surround the flowers and release a minty scent, making the plant naturally deer resistant.
The narrowleaf mountainmint grows in a variety of habitats, thriving in dry to medium-wet soils and tolerating full sun to partial shade. It can be found in open prairies, upland woods, low-lying areas, wet thickets, pine barrens, oak forests, and rocky ground. The plant spreads through rhizomes, which help stabilize soil and support its persistence in diverse ecological conditions.
After turning the leaves into a poultice, the Cherokee used the concoction to treat colds, fever, and upset stomach. The plant is also commonly used in herbal teas and culinary applications, valued for its minty aroma and flavor.
Habitat & Range
Common in moist old fields, sandy strem banks, and floodplains. Adapts to various conditions but prefers moist to dry, well drained soils, with full sun to partial shade.
Mostly found in the south and scattered elsewhere. See distribution map at BONAP.
Range: Native to eastern and central United States.
EMP: | FACW |
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NCNE: | FAC |
Phenology
Flowers July to September. Blooming period lasts from 4 to 8 weeks.
Characteristics
Inflorescence crowded, head-like clusters (rounded cymes) terminating the main stem and branches or in axils of upper leaves
Flowers small; corolla white, lower lip spotted with purple or brown spots; 4 stamens tucked inside the corolla; 5 petals fused into upper (2 lobes) and lower (3 lobes) lip
Leaves opposite, simple, linear & needle-like, pale green, glabrous; margins entire; 1-2″ long
Stems slender, glabrous, much-branched above
Fruit indehiscent black, dry nutlets; each flower has 4 nutlets; one seed per nutlet; seeds small, dark, hairless, dispersed by gusts of wind
Height 18 to 32 inches; spread 2 to 3 feet
Plant Codes
S-rank: S5 (Secure)
G-rank: G5 (Secure)
Faunal Associations
Many kinds of insects are attracted to the flowers of mountain mint, including long- and short-tongued bees, wasps, flies, butterflies, skippers, beetles, and plant bugs.
The plant is deer resistant due to its strong fragrance, bitter taste, and tough stem. It also resists browsing by groundhogs, voles, and rabbits for the same reasons.
Comments
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