Soft Rock Phosphate with Soluble Silicon

CalPhos soft rock phosphate delivers slow-release phosphorus and calcium alongside soluble silicon — a valuable secondary benefit that supports plant cell wall strength, pest resistance, and overall soil health. Natural, untreated colloidal clay phosphate from Canton Mills, OMRI listed for organic production.

  • Soluble silicon for enhanced plant health and pest resistance
  • OMRI listed for certified organic production
  • Not acid forming — will not cake or harden
  • Available in granular and standard powder forms
  • Sizes: 1 lb, 4 lb, 20 lb, and 50 lb

Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!