They reason it promotes more quality flowers. While it is true all plants need phosphorus to complete their life cycle, many soils have become high in phosphorus from continued use of high phosphorus fertilizers. Composts, manure and other organic fertilizers will build up soil phosphorus as well. The most recent Auburn University soil test summary indicates almost half of Alabama gardens don't need additional phosphorus. Adding more probably won't hurt, but it is a waste of a natural resource and could damage the environment.
Excessive nitrogen is often a reason flowers fail to bloom properly.
The more nitrogen you add, the more green, leafy growth you'll get at the expense of flowers. Follow these tips and help the environment while enjoying the most spectacular flowers in the neighborhood.