Fertilizer Deficit?
Most rapidly developing plants quickly deplete the nutrient reserves available in the growing medium. The first sign of trouble is a general yellowing of the entire plant. Do not apply only nitrogen; use a complete water-soluble fertilizer. Plants with too little fertilizer tend to turn pale green while new top leaves ascend. Few side branches develop as the oldest leaves turn yellow, dry and drop. Nutrients from older leaves are transferred by the plant to newer growth in the plants struggle to survive.
