Pycnanthemum tenuifolium (Slender Mountain Mint)

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner’s Sons, New York. Vol. 3: 142.

Where Commonly Found: Meadows, fields, disturbed land, CT, MA, ME, NH, NY, RI, VT.
How to Identify:
(For unfamiliar words: Wikipedia Glossary of Botanical Terms).
Go Botany Key to Pycnanthemum tenufolium.
Missouri Botanical Garden webpage for Pycnanthemum tenufolium
Flower Type:  Early-August to mid-September, white.  Upper stems end in small flat flower heads or short, white individual tubular flowers, sometimes spotted with purple, each about 1/4″ long.  The corolla is divided into an upper lip and lower lip that has 3 lobes.
Leaf Arrangement: 
Frequently branching, slender and hairless stems with slender opposite leaves. 
Leaf Type: 
The leaves are up to 3″ long by 1/4″ across, sessile, linear, hairless with a distinct central vein and smooth margins.
Height:  2′ – 3′
Seed Collection:  Seeds are tiny nutlets (that can be dispersed by wind) developing in a tube-like calyx.

Attracts:  Bees, Butterflies
Use:  Garden, Naturalizing
Light:  Full Sun to Part Sun
Hardiness Zone:  4 to 8  USDA Zone Map
Soils:  Dry to Moist
Notes:  Slender Mountain Mint is a pollinator magnet for bees and butterflies.  Will naturalize slowly in colder climates, so cautiously in the garden.
Native to the Northeast, South and Midwest US.  Biota of North America Program (BONAP) – North America Plant Atlas (NAPA).

Blog at

Up ↑

%d bloggers like this: