Why does your Petunia Opera Supreme Lilac Ice have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Petunias are heavy feeders, and a lack of nitrogen prevents the production of chlorophyll, leading to uniform yellowing, starting with older leaves. This is common in 'Opera Supreme' varieties during their peak blooming season when nutrient demand is high.
Excessive moisture in the potting medium displaces oxygen, suffocating the roots. For petunias, this leads to chlorosis (yellowing) as the root system fails to transport nutrients effectively.
If the soil pH is too high (alkaline), the petunia cannot absorb iron even if it is present in the soil. This typically manifests as bright yellow leaves with distinct dark green veins.
A lack of magnesium disrupts chlorophyll synthesis, often causing interveinal chlorosis on older leaves. This can occur in petunias if the soil has been heavily leached by frequent irrigation.
Your plant might also be experiencing one of these issues:
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