Cynoglossum nervosum

RHS Plant Profile

Himalayan hound's tongue

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Herbaceous Perennial

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An upright, but bushy clump-forming perennial with bristly, narrow, oblong green leaves. Reaches a height of 60cm. Sprays of the brightest azure flowers appear from mid-spring to mid-summer

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

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

Growing Conditions

Chalk Loam Sand

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

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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Boraginaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy, Clump forming, Columnar upright
Potentially harmful: Foliage may irritate skin. Wear gloves and other protective equipment when handling
Genus: Cynoglossum can be annuals, biennials or perennials, usually short-lived, with roughly hairy, simple, lance-shaped to oblong leaves and cymes of blue, purple pink or white, forget-me-not-like flowers from spring to autumn
Name Status: Correct
Plant Range: Himalaya

How to Grow

Cultivation

Grow in moist, well-drained soil in sun or partial shade

Propagation

Propagate by seed in a cold frame in autumn or spring or by division in spring

Suggested planting locations and garden types

City and courtyard gardens
Coastal
Cottage and informal garden
Wildlife gardens
Flower borders and beds
Wall side borders

Pruning

Cut all foliage back to ground level at the end of the growing season

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews