Why does your Rhododendron calendulaceum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
As an acid-loving species, Flame Azaleas are highly susceptible to Phytophthora if soil drainage is poor. Excessive moisture causes the fine feeder roots to decay, leading to a sudden inability to transport water and subsequent leaf abscission.
Rhododendron calendulaceum has shallow, fibrous root systems that are highly sensitive to desiccation. If the soil moisture drops below a critical threshold, the plant will shed leaves rapidly to reduce transpiration and conserve internal water reserves.
Sudden exposure to late spring frosts or extreme heat waves can damage the delicate leaf tissue of this native species. This physiological shock triggers a defense mechanism resulting in rapid leaf drop.
While usually a slower process, severe nutrient depletion in acidic soils can weaken the plant's structural integrity. This makes the petioles more prone to abscission during environmental stress.
Your plant might also be experiencing one of these issues:
English
Italiano
