This grower is sure of this plant identification.
Biennial flower, with one or more highly branching stems reaching heights of 15–80 cm. This is their year one, flowering from next year.
Wallflower, Blister cress
Erysimum genus (Wallflower). This genus consist of biennials, annuals, evergreen or semi-evergreen, short-lived perennials and sub-shrubs, and they are grown for their flowers.
They are fully to frost hardy and will need sun and well drained soil.
Grown for their flowers. Suitable for borders, banks and rock gardens.