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Herbaceous Perennial

Pycnanthemum flexuosum

Appalachian mountain mint

An upright, slow-spreading rhizomatous perennial wildflower with oval-shaped, aromatic, toothed green foliage, with faintly red margins, on hairy stems. Clusters of tufted, airy, white to very pale lavender purple flowers appear in the summer followed by seedheads for winter interest

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or North–facing or South–facing or West–facing

Exposure

Exposed or Sheltered

Drought resistance

Yes

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Lamiaceae
Native to the UK: No
Foliage: Deciduous
Habit: Bushy
Name status: Correct
Plant range: SE USA

How to grow

Cultivation

Grow in any well-drained soil in sun or partial shade

Propagation

Propagate by seed, or by division in spring

Suggested planting locations and garden types

Cottage and informal garden
Wildlife gardens
City and courtyard gardens
Low Maintenance
Flower borders and beds

Pruning

Cut back fading stems in late autumn, or early spring, unless you wish to keep the seedheads for winter interest

Pests

Generally pest-free

Diseases

Generally disease-free

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