Answer: Giant whitefly originally entered California in San Diego where it became a serious pest of hibiscus used as a food for animals at the San Diego Zoo. Since that time, this pest has spread up the coast towards Santa Barbara County. Efforts by the California Department of Food and Agriculture to introduce parasites in coastal parts of the state have been successful, and have significantly reduced numbers of this pest in those regions.
Before planting hibiscus, I'd suggest phoning your local Cooperative Extension office to get their recommendations on whether or not planting along the promenade would be problematic. Phone the Extension office at 323-838-8330.
Best wishes with your project!
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