Answer: It's possible that spider mites have taken up residence on your plants. The insects are tiny, but you can see them with a magnifying glass if you look at the plant stems where the leaves are attached. The most tell-tale sign of spider mites is the webbing they leave. They also cause yellowing of leaves, so your hibiscus may just now be exhibiting symptoms of their feeding. You can control them by directing a strong stream of water on all plant surfaces (upper and lower surfaces of leaves, all the stems, etc.), or by using an insecticidal soap. If you mix up your own soap and water solution and spray it on your plants, there's a chance that the solution will burn the leaves of your plants. Household soap products contain degreasers and caustic chemicals that are harmful to plants. If you spray, use a commercially prepared insecticidal soap; one that's proven to be safe on plants.
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