Why does your Zantedeschia Captain Melrose have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Zantedeschia species are sensitive to stagnant water; excessive moisture leads to Phytophthora or Pythium, which causes rapid decline and leaf abscission. As the rhizome begins to rot, the plant can no longer support its foliage, leading to sudden wilting and drop.
Calla Lilies are tropical to subtropical perennials that are highly sensitive to temperatures below 50°F (10°C). A sudden drop in temperature, often caused by drafts or nighttime cooling, triggers a stress response resulting in immediate leaf loss.
High humidity combined with poor airflow can trigger Botrytis, which causes lesions on the leaves that quickly lead to tissue death and leaf drop. This is especially common in 'Captain Melrose' during periods of damp, stagnant air.
A sudden lack of available nitrogen prevents the plant from maintaining chlorophyll levels in its large leaf surfaces. While usually a slower process, severe depletion can cause older leaves to yellow and drop abruptly.
Your plant might also be experiencing one of these issues:
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