The Grow #1 provides nitrate nitrogen, potassium, and calcium. Some plant varieties and growth conditions respond best to non-ammoniacal nitrate nitrogen formulas. This mix is specially blended to provide additional nitrogen for the foliage stage of leaf and stem growth. Grow #1 contains nitrate nitrogen which makes it especially desirable for steady, compact, dark green growth. Use for house plants, other long term plants, and for plants growing in low light conditions. This formula is often preferred for rockwool mediums, to maintain a stable nutrient pH. Grow #1 also provides high calcium, often deficient in other commercially available fertilizers. Use Grow #1 in combination with MicroBase, Grow #2 and Bloom #3 as desired. As separate components, the Genesis Formula system facilitates the capability to easily vary the nitrogen levels in your nutrient mixes.