Pycnanthemum tenufolium (Slender mountain mint)

Other names: Slenderleaf mountain mint, Slender-leaved mountain mint, Narrow-leaf mountain mint, Narrowleaf mountain mint, Koellia flexuosa, Common horsemint

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Species

P. tenufolium is an erect, clump-forming, aromatic, deciduous perennial with linear to narrowly lance-shaped, pointed, mid- to dark green leaves and clusters of small, two-lipped, white flowers from midsummer into autumn.

Season of interest

Flower
	Spring	Summer	Autumn	Winter
Flower
Foliage
	Spring	Summer	Autumn	Winter
Foliage

Height and spread

Metric |
Imperial

Height and spread Metric \| Imperial
Size	Max height	Max spread	To maturity
0.9 m	0.9 m	2-5 years
2 ft	2 ft	2-5 years

Height and spread

Metric |
Imperial

Size

Max height

Max spread

To maturity

0.9 m

2-5 years

2 ft

2-5 years

Where to grow

Soil

Soil type

Chalky
Clay
Loamy
Sandy

Soil drainage

Moist but well-drained
Well-drained

Soil pH

Acid
Alkaline
Neutral

Conditions

Sunlight

Partial Shade
Full Sun

Aspect

East
West
South

Exposure

Exposed
Sheltered

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Plant details

Additional plant details

Cultivation

Grow in well-drained or moist but well-drained soil in full sun or partial shade. Flowering is best in full sun. May spread aggressively by rhizomes. Tolerates drought, clay, and dry soil.

Suggested uses

Beds and borders, Cottage/Informal, City, Low Maintenance, Wildlife, Prairie planting, Bees (attract & feed bees), Meadow

UK hardiness

USDA zones

Zone 4, Zone 5, Zone 6, Zone 7, Zone 8

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Erect, Clump-forming, Branching

Native to

Eastern North America

Drought tolerant

Flood tolerant

Toxicity

Not toxic

Plant care

Pruning and propagation

Pruning

Cut back in late autumn. Prune roots in spring with a spade to prevent unwanted spread.

Propagation methods

Division, Stem tip cuttings

Propagation

Divide congested plants in spring or autumn.

Pests and diseases

Pests

Generally pest free. Deer resistant.

Diseases

Generally disease free

Monthly care advice

Divide and replant clumps in autumn or early spring

Water regularly through dry periods

Cut back in autumn (optional)

Plant in moist but well-drained soil (autumn or spring)

Plant in full sun or partial shade (autumn or spring)

Sow seeds in a cold frame in autumn

Sow seeds in a cold frame in spring

Other plants

Plants in this Genus (5)

Pycnanthemum

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Pycnanthemum muticum Cluster mountain mint

Pycnanthemum incanum Hoary mountain mint

Pycnanthemum virginianum Virginia mountain mint

Pycnanthemum tenufolium Slender mountain mint

Pycnanthemum flexuosum Appalachian mountain mint

This plant likes:	Garden project Loading... Selected garden	Results -% matchFor selected garden
Soil type Sandy Loamy		Plant match details will appear here
Soil drainage Moist well-drained Well-drained		Plant match details will appear here
Soil pH Neutral Alkaline Acid		Plant match details will appear here
Sunlight Full sun Partial shade		Plant match details will appear here
Aspect North facing South facing East facing West facing		Plant match details will appear here
Exposure Sheltered		Plant match details will appear here

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Pycnanthemum tenufolium (Slender mountain mint)

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Species

Season of interest

Flower

Foliage

Height and spread

Height and spread

Where to grow

Soil

Soil type

Soil drainage

Soil pH

Conditions

Sunlight

Aspect

Exposure

Plant details

Additional plant details

Cultivation

Suggested uses

UK hardiness

USDA zones

Sunset zone

WUCOLS

Foliage

Habit

Native to

Drought tolerant

Flood tolerant

Toxicity

Plant care

Pruning and propagation

Pruning

Propagation methods

Propagation

Pests and diseases

Pests

Diseases

Monthly care advice

Other plants

Plants in this Genus (5)

Plants in this Genus (5)

Companion plants (0)

Companion plants (0)

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