Erysimum × marshallii

RHS Plant Profile

Siberian wallflower

RHS

Other common names

Jack in the pulpit

Synonyms

Cheiranthus × allionii hort.
Erysimum allionii misapplied

Herbaceous Perennial Annual Biennial

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A short-lived evergreen perennial to 60cm in height, grown as a biennial for spring bedding, with coarsely toothed green leaves, and spicy-scented, vivid orange flowers in short racemes, in spring

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Alkaline or Neutral

Position

Full sun

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

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

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

How to Grow

Cultivation

Grow in poor to moderately fertile, well-drained, neutral or, ideally, alkaline soil; full sun is essential

Propagation

Propagate by seed sown from late spring to early summer

Suggested planting locations and garden types

Coastal
Cottage and informal garden
Patio and container plants
Wildlife gardens
Flower borders and beds
Bedding

Pruning

No pruning required

Pests

May be susceptible to slugs, snails and flea beetles

Diseases

May be susceptible to downy mildews, club root and bacterial leaf blight