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Why Bougainvillea Drops All Leaves and Flowers Suddenly

Sudden total leaf/flower drop signals extreme environmental shock: drastic changes in water, temperature, humidity, or drafts. Common cause: crown/stem rot from overwatering during winter dormancy. Inspect stems and soil for decay or discoloration. If present, discard the plant. Otherwise, stabilize conditions—consistent warmth, bright light, careful watering—and it may recover.

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