Why does your Dahlia Palm Beach have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Dahlias are heavy feeders, and a lack of nitrogen prevents the production of chlorophyll, causing older leaves to turn pale yellow first. This is common in dahlias grown in depleted or sandy soils.
Excessive moisture in the soil prevents oxygen from reaching the dahlia roots, leading to anaerobic conditions. This disrupts nutrient transport, manifesting as general yellowing of the foliage.
While typically known for gray mold, early fungal infections in dahlias can cause foliage to yellow and wilt. High humidity around the 'Palm Beach' cultivar's dense leaves often triggers this.
If your soil pH is too high (alkaline), the dahlia cannot absorb iron even if it is present in the soil. This results in interveinal chlorosis, where leaves are yellow but veins remain dark green.
Your plant might also be experiencing one of these issues:
English
Italiano
