More, Bigger, Better. . . blooms, vegetables and fruit! Spray-N-Grow is not a fertilizer, hormone, or hydroponic nutrient solution. Spray-N-Grow is a foliar micronutrient complex made up of naturally occurring elements essential for plant growth. Fertilizers and nutrient solutions provide your plants with major elements necessary for plant growth. Spray-N-Grow provides your plants with essential minor elements (micronutrients) not found in your current hydroponic nutrient solution.