Agastache rugosa 'Liquorice Blue'

RHS Plant Profile

Korean mint 'Liquorice Blue'

Synonyms

Agastache 'Liquorice'
Agastache urticifolia 'Liquorice'
Agastache urticifolia 'Liquorice Blue'

Herbaceous Perennial

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Bushy, upright herbaceous perennial to 1.2m tall, with aromatic, dark green, oval to lance-shaped leaves and long whorled spikes of tubular two-lipped purple-blue flowers which are very attractive to pollinators through summer to autumn

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–facing or East–facing
Exposure: 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): H4

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: Clump forming
Genus: Agastache are herbaceous perennials with simple, aromatic leaves and small 2-lipped tubular flowers in whorls forming dense spikes, in summer and autumn; some are rather tender but can be grown as annual bedding
Name Status: Accepted

How to Grow

Cultivation

Grow in well-drained soil preferably in full sun with shelter

Propagation

Propagate by seed or by division in spring

Suggested planting locations and garden types

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

Pruning

Deadhead throught the season to encourage more flowers

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews