Why does your Zantedeschia Red Alert have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Calla Lilies are susceptible to rhizome rot if the soil remains saturated for too long. Excessive moisture prevents oxygen from reaching the roots, leading to chlorophyll breakdown and yellowing foliage.
A lack of nitrogen prevents the plant from producing sufficient chlorophyll, causing older leaves to turn yellow first. This is common in container-grown 'Red Alert' varieties where nutrients are quickly depleted from the potting medium.
Zantedeschia species are sensitive to sudden drops in temperature. If the plant is exposed to temperatures below 50°F (10°C), the metabolic processes slow down, resulting in yellowing and drooping leaves.
While 'Red Alert' can tolerate partial shade, insufficient light prevents the plant from maintaining its energy reserves. This leads to chlorosis as the plant struggles to support its large leaf surface area.
Your plant might also be experiencing one of these issues:
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