Hibiscus Leaves With Black Spots - Knowledgebase Question

San Pedro, CA
Avatar for ullafetzer
Question by ullafetzer
March 14, 1998
What causes black spots on my hibiscus leaves? Only the leaves on the top branches are effected. Could it be pollution as they are the most exposed leaves? Also the flowers are much smaller than usual.

Answer from NGA
March 14, 1998
It could be pollution, but there are four different fungal diseases that cause black spots on hibiscus leaves. Just in case it is a disease, remove the affected leaves to keep it from spreading. Smaller than normal flowers might indicate overwatering or overfertilization. If buds drop before opening, it's because of overwatering. To encourage blooms, pinch out the tips of growing stems. You can remove old wood this spring to encourage more new stem growth, as well as maintain the plant's vigor.

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