Espoma RP7 Rock Phosphate, 7.25-Pound Pure mined phosphate rock containing 32% total phosphate All natural source of phosphorus for all flowering plants Promotes root growth Made in the USA Organic rock phosphate provides phosphorous for all flowering plants All natural and pelletized for easy application Mined from phosphorous rich natural deposits Carrying a formulation of 0-3-0 Comes in 7.25-pound bag