Why does your Rhododendron ferrugineum have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons are acidophiles; if the soil pH rises above 5.5, iron becomes chemically unavailable to the plant, causing interveinal yellowing on new growth.
Excessive moisture or poor drainage in alpine environments can lead to fungal pathogens attacking the root system, disrupting nutrient transport and causing widespread leaf yellowing.
A lack of available nitrogen in the growing medium prevents chlorophyll production, typically manifesting as a uniform yellowing starting from older, lower leaves.
Despite being an alpine species, extreme dry spells can cause the plant to shed chlorophyll and wilt as a defense mechanism against transpiration loss.
Your plant might also be experiencing one of these issues:
English
Italiano
