Double-flowering hibiscus is more prone to bud-drop than other variety. If temperatures in your area 90˚F or above, that can be causing the condition. Make sure the plant gets shade in midday and the hottest part of the afternoon. Fertilize it with diluted liquid fertilizer weekly (a balanced fertilizer high in potassium 20-20-20 is good) and water evenly, not too much or too little.

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