TCS GrowStar™ professional fertilizers are blended with the highest quality raw materials on the market, filtered three times before bagging to provide limited dust and formulated with the most innovative technologies to assure outstanding results. The 20-0-10 nutrient blend delivers essential macronutrients: 20% nitrogen to stimulate vigorous green growth, 10% potassium for root development and disease resistance, and no phosphorous to suit specific soil needs. This fertilizer contains Atrazine, a widely used herbicide to control broadleaf and grassy weeds.