Vinny's Growers Choice is a two part nutrient system which has been used successfully for over 20 years in Canada. The two part system offers simplicity to the grower without sacrificing yield or quality of the product. The Grow component contains all of the essential plant nutrients at levels ideal for vegetative growth and the Bloom component contains the proper ratios needed for flowering. The Common is to be used in conjunction with the other parts and will provide Calcium which is not compatible in high concentrations with the Phosphorus and Sulfur contained in the other components and rounds off the nutrient requirements of the plants.