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| Category: Perennial |
| Family: Brassicaceae (Cruciferae) (Mustards) |
| Origin: Channel Islands (North America) |
| Evergreen: Yes |
| Flower Color: Yellow |
| Bloomtime: Spring/Summer |
| Synonyms: [Erysimum insulare ssp. insulare] |
| Height: 1-2 feet |
| Width: 2-4 feet |
| Exposure: Full Sun |
| Irrigation (H2O Info): Low Water Needs |
| Winter Hardiness: 20-25° F |
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Erysimum insulare (Island Wallflower) An semi-evergreen woody perennial or short lived subshrub to 12 to 18 inches tall by 2 to 4 feet wide. The upright stems bear 2 to 3 inch long narrow green leaves and terminate with a raceme of fragrant bright yellow flowers over several months in the spring that are followed by long narrow fruits (saligue). Plant in full sun in a well-drained soil. It is drought tolerant in coastal gardens and hardy to 20 ° F. Appearance is improved by occasional summer water and pruning in late summer or fall to remove spent inflorescences and to promote vigorous new shoots from the base. Effective in mixed borders or rock gardens. This plant comes from the Santa Barbara Channel Islands and ranges on all 4 of the northern islands as a component of the coastal scrub and coastal dune plant communities, though it is rare on Santa Cruz Island and atypical on Anacapa Island. Another subspecies is on the mainland. Our plants were from cuttings from a plant accessioned at the Santa Barbara Botanic Garden as (SBBG 97-181) that was from seed collected in May 1997 at Carrington Point on Santa Rosa Island by Kathryn McEachern and Dieter Wilken. Our thanks to Carol Bornstein for introducing us to this plant and for providing the image on this page.
Information on this page is based on research conducted in our nursery library, from online sources, as well as from observations made of this plant as it grows in our nursery, in the nursery's garden and in other gardens where we have observed it. We also will incorporate comments received from others and welcome getting feedback of any kind from those who have additional information, particularly if this information is contrary to what we have written or includes additional cultural tips would aid others in growing Erysimum insulare.
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