Why does your Petunia African Sunset have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Petunias are heavy feeders and require consistent nitrogen to maintain their lush, dark foliage. When nitrogen is depleted from the soil or leached away by frequent watering, the plant cannot produce sufficient chlorophyll, leading to uniform yellowing of older leaves.
Petunias are susceptible to root rot if the substrate remains saturated for too long. Lack of oxygen in the rhizosphere prevents the roots from absorbing nutrients, which manifests as yellowing foliage that may feel slightly limp.
If the soil pH becomes too alkaline (above 6.5), Petunias cannot uptake iron effectively. This results in interveinal chlorosis, where the leaf tissue turns yellow but the veins remain distinctively green.
Common in container-grown Petunias where magnesium can be leached out by heavy rain or frequent fertilization. This deficiency typically causes yellowing between the veins, often appearing first on older leaves.
Your plant might also be experiencing one of these issues:
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