Macronutrient - Phosphorus (P) is essential in the process of photosynthesis where it is involved in the formation of sugars and carbohydrates. It has an impact on plant growth, flower blooming and root growth.

Sources - From the soil, complete fertilizers, bone meal and superphosphate.

Note: We have provided some general information and observations on this topic aimed at the home gardener. Before you take any serious action in your landscape, check with your state's land grant university's Cooperative Extension Service for the most current, appropriate, localized recommendations.