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Pycnanthemum tenuifolium (Narrowleaf Mountain Mint)

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

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

Prized for its long blooming season and exceptional value to pollinators, Pycnanthemum tenuifolium (Narrowleaf Mountain Mint) is a stiff, upright, many-branched perennial with aromatic foliage. Its very narrow, almost needle-like leaves create a fine-textured, silvery-green appearance and release a pleasant minty fragrance when crushed. From early summer into early fall, numerous small, white, two-lipped flowers are packed into dense clusters at the tips of the stems.

The nectar-rich flowers attract an impressive diversity of bees, butterflies, and other beneficial insects. Swallowtails are frequent nectar visitors. Narrowleaf Mountain Mint also serves as a larval host plant for the Gray Hairstreak butterfly and the Wavy-lined Emerald moth. The aromatic leaves have traditionally been used to flavor teas.

Tough, adaptable, and easy to grow, Narrowleaf Mountain Mint is an excellent choice for pollinator gardens, wildlife gardens, prairies, meadows, woodland edges, and naturalized areas where it has room to spread. Although it expands by rhizomes and can form sizable colonies, its spread is generally easy to manage by dividing or removing unwanted growth.

  • Grows up to 2-3 ft. tall and wide (60-90 cm). Spreads by creeping rhizomes and may form colonies over time.
  • Thrives in full sun to part shade in average, dry to medium moisture, well-drained soils. Tolerant of drought, clay, and dry soil once established.
  • Ideal for prairies and meadows, native plant gardens, pollinator gardens, wildlife gardens, and naturalized areas.
  • No serious pest or disease issues.
  • Propagate by cuttings in early summer or by division in late fall or early spring.
  • Native to eastern North America.
  • How to Build a Wildlife Garden that Buzzes with Life Year-Round

Requirements

Hardiness 4 - 8
Plant Type Perennials
Plant Family Lamiaceae
Common names Mountain Mint
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)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Northeast, Pennsylvania, Rhode Island, Vermont, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Illinois, Indiana, Iowa, Kansas, Michigan, Midwest, Minnesota, Missouri, Nebraska, Ohio, Wisconsin, Southeast, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Alabama, Arkansas, Florida, Georgia, Kentucky, Southwest, Texas, Oklahoma
Tolerances Drought, Dry Soil, Rocky Soil, Clay Soil, Erosion
Attracts Bees, Birds, Butterflies
Garden Uses Ponds And Streams, Rain Gardens
Garden Styles Butterfly Garden, Informal and Cottage, Pollinator Garden, Prairie and Meadow
Toxic to Humans No known toxicity
Toxic to Cats No known toxicity
Toxic to Dogs No known toxicity
Toxic to Horses No known toxicity
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Recommended Companion Plants

Schizachyrium scoparium (Little Bluestem)
Oligoneuron rigidum (Stiff Goldenrod)
Sporobolus heterolepis (Prairie Dropseed)
Echinacea paradoxa (Yellow Coneflower)
Rudbeckia hirta (Black-Eyed Susan)
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.
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Requirements

Hardiness 4 - 8
Plant Type Perennials
Plant Family Lamiaceae
Common names Mountain Mint
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)
Maintenance Low
Water Needs Low, Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, Northeast, Pennsylvania, Rhode Island, Vermont, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Illinois, Indiana, Iowa, Kansas, Michigan, Midwest, Minnesota, Missouri, Nebraska, Ohio, Wisconsin, Southeast, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Alabama, Arkansas, Florida, Georgia, Kentucky, Southwest, Texas, Oklahoma
Tolerances Drought, Dry Soil, Rocky Soil, Clay Soil, Erosion
Attracts Bees, Birds, Butterflies
Garden Uses Ponds And Streams, Rain Gardens
Garden Styles Butterfly Garden, Informal and Cottage, Pollinator Garden, Prairie and Meadow
Toxic to Humans No known toxicity
Toxic to Cats No known toxicity
Toxic to Dogs No known toxicity
Toxic to Horses No known toxicity
How Many Plants
Do I Need?

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