Why does your Cladrastis have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Nitrogen is a mobile nutrient; when deficient, the tree pulls it from older leaves to support new growth, causing uniform yellowing of the entire leaf blade starting with the oldest foliage. This is common in Cladrastis planted in low-organic matter or depleted soils.
High soil pH (alkaline conditions) prevents Cladrastis from absorbing iron, resulting in interveinal chlorosis where leaf veins remain green while the rest of the leaf turns yellow. This is a frequent issue for American Yellowwoods in limestone-heavy soils.
Cladrastis is sensitive to extreme soil moisture fluctuations; drought causes leaf yellowing and premature drop, while waterlogged roots lead to root hypoxia and chlorosis. Improper drainage in heavy clay soils often triggers this symptom.
Excessive moisture in poorly drained sites can lead to fungal pathogens attacking the root system, preventing nutrient transport and causing systemic yellowing. This often manifests as wilting alongside the discoloration.
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