Erysimum 'Winter Passion'

RHS Plant Profile

wallflower 'Winter Passion'

RHS / Joanna Kossak

Herbaceous Perennial

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A short-lived, evergreen perennial to about 50cm. Branching, woody-based stems bear narrow, dark green leaves and terminal clusters of fragrant, dark red flowers which fade to purple, over a long period from spring to autumn

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Clay Loam Sand

Moisture: Well–drained
pH: 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

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Brassicaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Genus: Erysimum can be annuals, biennials or woody-based perennials with narrow leaves and dense racemes of often fragrant, 4-petalled flowers
Name Status: Unresolved

How to Grow

Cultivation

Grow in poor to moderately fertile, well-drained, preferably alkaline soil in full sun

Propagation

Propagate by semi-ripe cuttings, using shoots without flower buds

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Wildlife gardens
Flower borders and beds

Pruning

Deadhead to prolong flowering and cut back by half after flowering to prevent plants getting leggy

Pests

May be susceptible to slugs, snails and flea beetles

Diseases

May be susceptible to a range of diseases including club root, downy mildews, leaf spot, root rot and a virus