Yellowing leaves are one of the most common hibiscus complaints, and the cause can range from completely normal to a sign something needs adjusting.
Natural Leaf Drop
Hibiscus regularly shed older leaves as part of normal growth. If it's just a few lower leaves yellowing while the rest of the plant looks healthy, this is nothing to worry about.
Overwatering or Poor Drainage
Hibiscus dislike soggy roots, and overwatering is one of the most frequent causes of widespread yellowing. Make sure the pot or planting site drains well and let the soil dry slightly between waterings.
Nutrient Deficiency
Hibiscus are heavy feeders, and a lack of nitrogen or iron can cause yellowing, especially in container-grown plants. A fertilizer formulated for flowering tropicals usually resolves this within a few weeks.
Temperature Stress
A sudden cold snap or drastic temperature swing can shock a hibiscus into dropping yellow leaves. The plant usually rebounds once conditions stabilize.
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