Alphabetical Plant Listing

Pycnanthemum tenuifolium (Narrowleaf Mountain Mint)

Narrowleaf Mountain Mint, Slender Mountain Mint, Common Horsemint, Koellia flexuosa, Pycnanthemum flexuosum


Prized for its long blooming season, Pycnanthemum tenuifolium (Narrowleaf Mountain Mint) is a stiff, erect, many-branched, aromatic perennial adorned with very narrow, almost needle-like, silvery leaves. The leaves exude a pleasant minty fragrance when crushed. In early summer to early fall, an abundance of small, white, two-lipped flowers appear in dense clusters atop the stems. The flowers are a favorite of bees and butterflies. The leaves have been used to flavor teas. Narrowleaf Mountain Mint is a good choice for meadows, wildlife gardens, woodland edges where it can roam freely.

  • Grows up to 2-3 ft. tall and wide (60-90 cm). Can spread aggressively (by creeping rhizomes) but is easily controlled by occasional root division.
  • Thrives in full sun to part shade in average, dry to medium, well-drained soils. Drought, clay and dry soil tolerant.
  • Best for prairies and meadows, native plant gardens and naturalized areas.
  • No serious pest or disease issues.
  • Propagate by cuttings in early summer or division in late fall or early spring.
  • Native to eastern North America.

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Requirements

Hardiness 4 – 8
Plant Type Perennials
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 36" (90cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, Ohio, Wisconsin, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Southeast, Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Southwest, Oklahoma, Texas
Tolerance Clay Soil, Drought, Dry Soil, Rocky Soil
Attracts Birds, Butterflies
Garden Uses Ponds and Streams
Garden Styles Informal and Cottage, Prairie and Meadow

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Doug McGrady, Peganum, Flickr, Jeff Holcombe, Shuterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 4 – 8
Plant Type Perennials
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 36" (90cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, Ohio, Wisconsin, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Southeast, Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Southwest, Oklahoma, Texas
Tolerance Clay Soil, Drought, Dry Soil, Rocky Soil
Attracts Birds, Butterflies
Garden Uses Ponds and Streams
Garden Styles Informal and Cottage, Prairie and Meadow

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