Wallflower (Erysimum)

Erysimum is a diverse genus of wallflowers in the mustard family, Brassicaceae. Its species and cultivated selections vary in life cycle, flowering season, mature size, hardiness, and garden care. ## Choosing a wallflower Select a species or named cultivar for the conditions and mature dimensions of the planting site; do not assume one wallflower profile describes every Erysimum. The [Kew Plants of the World Online genus record](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:329617-2) recognizes Erysimum in Brassicaceae. NC State Extension describes E. × hybrida as a perennial or biennial hybrid that may be grown as a cool-season annual in southern climates, illustrating the variation within cultivated wallflowers. ## Siting Follow the selected species or cultivar's guidance for light, drainage, water, hardiness, and spacing. For example, NC State recommends average to sandy soil and full sun for E. × hybrida and notes that it is drought tolerant once established; those recommendations should not be transferred automatically to all species in the genus. ## Maintenance Use the plant label or a reliable profile for the exact species or cultivar when planning pruning, watering, and replacement. Check mature size and local hardiness before planting, since the genus includes plants with different growth forms and seasonal behavior.