This perennial is native to the cliffs of Pt. Reyes, where it grows in profusion. Requires lots of sun and little summer water. Several hybrids of Erysimum are also available and do well in Northern California:
Perennial in Zones 4–6, 14–17, 22, 23, but usually grown as a biennial or annual. From southern Europe. Best in cool, moist regions. Branching, woody-based plants 1–2 1/2 ft. tall, 1–1 1/2 ft. wide, with narrow bright green leaves and broad clusters of showy, sweet-scented flowers in spring. Blossoms are yellow, cream, orange, red, brown, or burgundy, sometimes shaded or veined with contrasting color.
Under ideal conditions in coastal Pacific Northwest may bloom year-round. Sow seeds in spring for bloom the following year (some strains flower the first year if seeded early); or set out plants in fall or earliest spring. May self sow.
Many excellent choices available under this group.
This is the most popular of the Erysimum hybrids, growing 3 ft. tall and 4–6 ft. wide, with narrow gray-green leaves held on erect stems, each topped by a 1 1/2 -ft.-long, narrow, spikelike cluster of mauve flowers. Best in areas with cool summers and mild winters, where bloom is practically continual; elsewhere plants bloom from winter through spring.
Often short lived.