Mentha longifolia Buddleia Mint Group

RHS Plant Profile

horse mint buddleia mint group

Synonyms

Mentha longifolia 'Buddleia'

Herbaceous Perennial Herbs - Culinary

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A vigorous, creeping, perennial herb with hairy stems that bear aromatic, oblong, toothed, silvery grey-green leaves. Dense spikes of whorled, tubular white or pale purple flowers appear in summer. Attractive and unusual while edible and useful, suitable for container growing or open soil site

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 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: East–facing or North–facing or South–facing or West–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): H5

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: Spreading branched
Genus: Mentha are aromatic, rhizomatous perennials with opposite, toothed leaves and small tubular flowers in spikes of whorls in summer
Name Status: Accepted

How to Grow

Cultivation

Grow in moist but well drained soil in full or partial sun. May have the potential to become a nuisance; restrict the root run in a deep container and plunge into the ground, or plant in a well chosen site where it can grow unrestricted. See mint cultivation for more information

Propagation

Propagate by seed or division in spring or autumn

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Wildlife gardens
Flower borders and beds

Pruning

Cut back to ground level in autumn

Pests

May be susceptible to caterpillars and leafhoppers

Diseases

May be susceptible to mint rust and powdery mildews