Function: root growth & development; bloom; energy storage & transfer within plant
Deficiency Produces purplish coloring; stunted roots
- Tan Rock Phosphate (Espoma brand, for example)
- this is plain ground rock, not the superphosphate that is commonly available
- Phosphorus is 4% of the product
- Apply 2 to 10 pounds per 100 square feet*
- Black Rock Phosphate for carbon-deficient soils
For new lawns, double the phosphorus, in order to establish strong root systems.