Why does your Rhus copallina have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Winged Sumac, nitrogen deficiency typically manifests as a uniform yellowing of the older leaves first, as the plant mobilizes nutrients to new growth. This is common in depleted or highly leached soils where sumac is planted.
While Rhus copallina is drought-tolerant, waterlogged soil prevents oxygen from reaching the roots, causing chlorophyll breakdown. This leads to chlorosis (yellowing) and can eventually cause leaf drop.
If the soil pH is too high (alkaline), the Sumac cannot uptake iron effectively. This results in bright yellow leaves with distinct dark green veins (interveinal chlorosis).
Extreme fluctuations, such as a sudden late spring frost or intense heatwaves, can disrupt the photosynthetic processes in Rhus copallina. This often causes leaves to yellow before they senescence.
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