I am using the General Organics BioThrive line. I noticed it mentioned "This product works best with soils that contain calcium" and goes on to say that adding CaMg+ may be necessary for depleted soil, rockwool, etc... The "Premium Potting Mix" I use doesn't get very specific in it's description. All it says is... INGREDIENTS: This product is regionally formulated from organic materials derived from one or more of the following: Canadian Sphagnum Peat Moss, Composted Forest Products, Composted Yard Products, Peat Humus, Perlite. Agway - Lawn, Garden, Pet, Bird and Farm Specialists | Agway Branded > Home & Garden > Soil > Potting > AGWAY PREMIUM POTTING MIX 1CF So my question is, Is there already sufficient calcium levels in this soil or should I use an additive ? Any suggestions would be appreciated....
I would add powdered dolomite lime, garden lime, oyster shell flour, or some similar form of Ca to your mix. What is available in your area? Wet
That's the stuff - it's harvested from the floor of San Francisco Bay and is processed in Petaluma, California as it has been since 1925 or so. Good stuff! LD
Same amount that you would use for dolomite lime - about 1 tablespoon per 1 gallon of potting soil. Or whatever the traditional amount usually quoted. HTH LD Limestone, Calcite Lime, Oyster Shell Powder - almost pure Calcium Carbonate (CaCO3) - Calcium (Ca++) • Carbon (C) • Oxygen (O)3