Hesperantha coccinea 'Jack Frost'

RHS Plant Profile

crimson flag lily 'Jack Frost'

RHS

Synonyms

Schizostylis coccinea 'Jack Frost'

Herbaceous Perennial

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A semi-evergreen cormous perennial, forming a clump of narrow, lance-shaped leaves. This late-flowering cultivar produces upright spikes of starry white flowers, tinted with palest pink, from autumn through to mid-winter

Position

Full sun

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

Aspect: 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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Iridaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Clump forming
Genus: Hesperantha are semi-evergreen, rhizomatous perennials with narrowly sword-shaped, erect leaves and spikes of starry or bowl-shaped flowers from late summer to late autumn
Name Status: Unresolved

How to Grow

Cultivation

Grow in moderately fertile, moist but well-drained soil in full sun. Shelter from cold drying winds, and protect with a dry mulch in winter. May be evergreen in frost-free areas, cold winds and frosts may blacken leaves over winter

Propagation

Propagate by division in spring

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Prairie planting
Cut flowers
Flower borders and beds
Wall side borders

Pruning

Deadhead to promote flowering. Cut down stems after flowering

Pests

Generally pest-free

Diseases

Generally disease-free