Rock Phosphate


Source of phosphorous, calcium, silicas and trace minerals.

available sizes: 5 lbs, 25 lbs

density:  0.64 lbs per cup
release time:  0-2 years

Derived from untreated colloidal rock phosphate

For all plants.

Application Rates – always mix into soil

Roses, flowers, large plants and shrubs: 1 cup per plant early in season (or at planting).

Vegetable gardens/beds:  10 lbs per 100 square feet, per month.

Containers:  2 tablespoons per gallon of soil at planting.

Trees:  2 lbs per 2″ of trunk diameter.

See ‘Plant feeding requirements‘ if you are using rock phosphate in combination with other products or for more information.

See ‘Feeding with organics‘ for general information on using organic nutrients.


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