Holes in hibiscus leaves
Any number of insects could be chewing on your hibiscus. Hibiscus sawfly is a tiny wormlike creature that can strip hibiscus plants fairly quickly. Grasshopppers also will eat hibiscus. Spinosad is a natural insecticide that should kill most chewing insects. If it is grasshoppers, however, you probably know that they can move in readily from surrounding areas to continue feeding.
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