Incarvillea delavayi 'Snowtop'

RHS Plant Profile

Delavay hardy gloxinia 'Snowtop'

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Synonyms

Incarvillea delavayi 'Alba'
Incarvillea 'Snowcap'

Herbaceous Perennial

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A herbaceous perennial to around 60cm high, with a basal rosette of pinnate leaves divided into pairs of coarsely toothed leaflets. Clusters of showy, tubular to funnel-shaped white flowers with yellow throats are produced on upright stems in early and mid summer

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
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–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): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Bignoniaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: Incarvillea are annuals or perennials grown for their tubular, trumpet-shaped flowers. Some species are suited to rock gardens whilst others can be grown in a mixed, herbaceous border.
Name Status: Accepted

How to Grow

Cultivation

Grow in fertile, moist but well-drained soil, in a sunny spot but ideally with some shade in summer. Protect from excess winter wet, and mulch well in areas prone to hard frosts

Propagation

Propagate by seed, or by basal softwood cuttings in spring. Plants grown from seed may take up to three years to flower

Suggested planting locations and garden types

Cottage and informal garden
Gravel garden
Rock garden
Banks and slopes
Flower borders and beds

Pruning

Cut back spent flower stems

Pests

May be susceptible to slugs

Diseases

Generally disease-free