Green Air 93120 Hydroponic Garden Grow 1 Nutrient Solution, 16-Ounce 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 Grow 1 also provides high calcium, often deficient in other commercially available fertilizers This formula is often preferred for rockwool mediums, to maintain a stable nutrient ph The green growth component of the hydroponics nutrient solution, measures 2.4 inches in length by 2.4 inches in width by 8 inches in height