Gentiana asclepiadea 'Alba'

RHS Plant Profile

willow gentian 'Alba'

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Synonyms

Gentiana asclepiadea var. alba

Herbaceous Perennial

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A clump-forming perennial to 80cm high, with upright to arching stems bearing lance-shaped deep green leaves with heavily impressed veins. Upright, trumpet-shaped white flowers, sometimes tinted or speckled with green, are produced in the upper leaf axils in late summer and early autumn

Position

Full sun, Partial shade

Soil Types

Clay, Loam

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

Clay Loam

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

Position

Full sun Partial shade

Aspect: East–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

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Gentianaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming, Columnar upright
Genus: Gentiana can be annuals, biennials, herbaceous or evergreen perennials, mostly with showy, trumpet or salver-shaped flowers
Name Status: Accepted

How to Grow

Cultivation

Grow in reliably moist but well-drained, humus-rich, acid or neutral soil. In areas with warm, dry summers these plants are best grown in light or partial shade

Propagation

Propagate by division in spring

Suggested planting locations and garden types

Cottage and informal garden
Wildflower meadow
Low Maintenance
Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to a rust and a virus