Why does your Alocasia macrorrhizos have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive moisture in the substrate leads to anaerobic conditions, causing Phytophthora or Pythium species to attack the roots. As the root system decays, it can no longer support the large leaf structures of the Alocasia, leading to rapid senescence and stem collapse.
Alocasia macrorrhizos is a tropical species highly sensitive to cold drafts or sudden drops in temperature. Exposure to temperatures below 15°C (60°F) causes the plant to enter a defensive state, shedding leaves to preserve energy for the rhizome.
While the roots may be hydrated, extremely dry indoor air causes rapid transpiration from the large leaf surface area. This moisture deficit forces the plant to drop older leaves to reduce its overall water requirements.
A lack of available nitrogen prevents the plant from maintaining chlorophyll levels in its massive leaves. In extreme cases, the plant will sacrifice older, larger leaves to redirect remaining nutrients to new growth.
Your plant might also be experiencing one of these issues:
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