Why does your Rhododendron periclymenoides have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Rhododendron periclymenoides requires consistently moist but well-drained acidic soil; sudden leaf drop is a classic defense mechanism when the fine root system fails to access water due to extreme dryness or oxygen deprivation from saturated roots.
This soil-borne oomycete attacks the roots of azaleas in poorly drained conditions, leading to a rapid decline in vigor and sudden defoliation as the plant can no longer transport nutrients.
Rapid fluctuations, such as a sudden late spring frost or an unseasonably hot dry spell, can cause the plant to shed leaves to reduce transpiration and protect its core structure.
While usually a slower process, severe lack of available iron due to improper soil pH can weaken the plant significantly, making it susceptible to sudden leaf shedding under any secondary stress.
Your plant might also be experiencing one of these issues:
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