Wallflower

Erysimum cheiri

Short-lived perennial Mediterranean shrublet, traditionally grown as a biennial, with intensely fragrant clusters of yellow, orange, red, or mahogany flowers in mid-spring. A cornerstone cottage-garden bedding plant.

Hardiness ratings

Wallflower hardiness across the four zone systems
SystemRatingTemperature rangeHow to read it
USDA hardiness zone Zone 6–10 −23.3 °C to 4.4 °C Plant tolerates down to this zone
RHS hardiness rating H5 −15 °C to −10 °C Plant needs at least this level of cold tolerance
Canadian plant hardiness zone Zone 7–8 −12 °C to −1 °C Plant tolerates down to this zone
Australian (ANBG) zone Zone 2–5 −10 °C to 10 °C Plant tolerates down to this zone

Growing notes

  • Plant as spring bedding alongside tulips and forget-me-nots — fragrance carries on warm spring afternoons
  • Edible flowers — clove-fragrant, used as salad garnish and in spring cordials
  • Strictly biennial in most climates — sow each summer for the following spring display
  • Hardy modern cultivar ‘Bowles’s Mauve’ is reliably perennial in mild climates and flowers almost continuously

Categories

Related plants

Cross-check Wallflower against your zones

Reference

Wallflower on Wikipedia