Down To Earth™ Rock Phosphate 0-3-0 – 5lb – OMRI Listed®
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. OMRI Listed®.