Down To Earth Rock Phosphate 0-3-0
Soft rock phosphate, or colloidal phosphate, is a natural, untreated source of long-lasting phosphate and soil-building calcium. Phosphate will remain available across a wide pH range. For best availability, soft rock phosphate should be mixed into soil or compost prior to planting.

5 lb. Box

OMRI Approved (Organic Materials Review Institute)
CDFA Approved (Registered Organic Input Material)