Calphos Soft Phosphate (50 Lb)

Calphos Soft Rock Phosphate is a premium-grade, natural phosphorus and calcium amendment perfect for promoting stronger root growth, higher crop yields, and sustainable soil health. Sourced from ancient marine deposits, this colloidal phosphate provides an immediate source of phosphorus and releases nutrients for up to 5 years. It's also OMRI-listed for organic gardening and improves soil microbial activity.