How to prevent dahlia leaves from turning yellow and falling off

Pay attention to the choice of potting soil

Dahlias are suitable for growing in loose, humus-rich, well-drained sandy loam or artificially prepared nutrient soil.

Suitable light and temperature

Dahlias love light and need sufficient sunlight throughout the growing period, but not too strong. Direct sunlight should be avoided during the seedling stage. Dahlias are neither cold-resistant nor heat-resistant. The most suitable growth temperature is 10℃ ~ 30℃.

Strengthen water and fertilizer management

Dahlias have fleshy, tuberous roots that are neither drought-tolerant nor waterlogged. When watering, you should follow the principle of "water thoroughly when the soil is dry". During heavy rain, you should drain the accumulated water in the pot in time. Dahlias like fertilizer. When applying base fertilizer, be careful not to let it come into contact with the root tubers to prevent burns.

Strengthen disease prevention and control

The main diseases of dahlia are powdery mildew and leaf spot, so ventilation and drug control should be strengthened.