Warm Season Spring I is specially formulated for Bermuda & Zoysia grass. Crushed limestone and soft rock phosphate is applied to your lawn. The limestone will help neutralize the natural acidity of the soil and will provide a source of calcium, an important nutrient for healthy root and plant growth. Calcium also functions as a conditioner to help reduce soil compaction. The soft rock phosphate provides a slow and uniform release of phosphorus and calcium. This natural form of phosphorus is non-acid producing and stimulates root growth and plant vigor. Spot weed control for broadleaf weeds and weed grasses is done at this time.