Why does your Rhododendron keiskei have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons are acid-loving plants; if the soil pH rises above 5.5, iron becomes chemically unavailable to the plant, leading to interveinal yellowing on new growth.
Rhododendron keiskei has a shallow, fibrous root system that is highly susceptible to anaerobic conditions. Excessive moisture prevents oxygen from reaching the roots, causing chlorosis and eventual leaf drop.
Oomycete pathogens like Phytophthora thrive in waterlogged soils common to ericaceous plants, destroying the root cortex and disrupting the transport of nutrients to the leaves.
A lack of available nitrogen in the growing medium can lead to a general yellowing (chlorosis) that often starts on older, lower leaves first.
Your plant might also be experiencing one of these issues:
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