Hibiscus shrubs need generous, daily watering. These moist conditions help the plant produce bright, vibrant flowers. However, excessive moisture is also ideal for mould growth. Caring for hibiscus plants requires a working knowledge of white mould issues.
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The most common white plant mould is mildew. Mildew damaged leaves contain white, fuzzy or powdery blotches. Cut off infected leaves and spray the plant with a general purpose fungicide.
Some rarer forms of mould, such as "silver leaf" or "honey" fungi, can appear on a hibiscus. These moulds are usually greyish or yellow, but they sometimes appear white. Mold is a specific type of fungus, and a general purpose fungicide will kill these moulds.
If you notice fine silk webbing on your hibiscus plant, you likely do not have a mould problem. Spider mites are likely the true culprit. Spider mite damage looks similar to mould growth, producing whitish leaf spots. Common chemical pesticides are usually not very effective against spider mites; kill spider mites with a soap-based insect spray.
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