Soft rock phosphate, is a naturally occurring combination of phosphorus, calcium and trace minerals that provide a long term supply of phosphate, calcium and other minerals supply that are non-soluble.
Application Rate:
Gardens & Raised Beds:
Add 3 lbs. per 100 square feet and mix into the top 3″ of soil. For transplants, add 2 tbsp. per hole, mix into soil and water. Established plants should be side dressed 2-4 tbsp., depending on plant size and desired growth rate, once each month during the growing season.
Containers:
For plantings, add 2-4 tbsp. per gallon of soil and mix or add 13 lbs. per cubic yard.