Pycnanthemum muticum

RHS Plant Profile

short-toothed mountain mint

Other common names

big leaf mountain mint, clustered mountain mint

Herbaceous Perennial

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An aromatic, herbaceous perennial to about 90cm with bright green, velvety leaves arranged in pairs. The very pale pink flowers with silvery bracts cluster in flattened whorls at the top of the stem in late summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or West–facing or North–facing or East–facing
Exposure: Exposed or Sheltered
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): H7
Drought Resistance: Yes

Colour & Scent

Fragrance Foliage

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lamiaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus
Name Status: Correct
Plant Range: E 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
City and courtyard gardens
Wildlife gardens
Low Maintenance
Flower borders and beds

Pruning

Cut back fading stems in late autumn, or early spring

Pests

Generally pest-free

Diseases

Generally disease-free