Phosphorus Deficiency
When plants are deficient in phosphorus, they commonly show slow, stunted growth and poor early development. Foliage often appears darker green than normal, and older leaves may develop purplish or reddish coloration, especially along veins or petioles, because phosphorus is a mobile nutrient that moves from older to younger tissue when supplies are limited. Root growth, flowering, and overall plant vigor are also frequently reduced.
