Why does your Phalaenopsis Alicante have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive moisture in the orchid bark prevents aeration, leading to decaying roots that cannot support the plant's hydraulic pressure. As the root system fails, the Phalaenopsis can no longer supply water to the leaves, triggering rapid senescence and leaf drop.
Phalaenopsis orchids are tropical plants that thrive in stable temperatures; sudden exposure to drafts or cold windows can trigger a stress response. A significant drop in temperature causes the plant to shed leaves as a survival mechanism to reduce transpiration.
If the medium has become bone-dry and hydrophobic, the orchid's velamen (the spongy root coating) cannot absorb moisture. Prolonged drought stress in Phalaenopsis leads to the mobilization of nutrients from older leaves to new growth, causing them to drop.
Bacterial infections can rapidly compromise the vascular tissue of the Phalaenopsis leaf. Once the infection reaches the leaf petiole, it breaks down cellular structure, causing the leaf to detach from the stem almost immediately.
Your plant might also be experiencing one of these issues:
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