Miracle-Gro usually refers a plant foo brand made by Scotts Miracle-Gro Company. It is commonly used in gardens and houseplants because Miracle-Gro provides nutrients to plants that are otherwise depleted from the soil over time. This usually causes accelerated growth because Miracle-Gro provides readily available material for plants to use in the production of new cells. One of the main components of this chemical fertilizer is nitrogen derived from ammonium and nitrates. Miracle-Gro fertilizers come in different ratios of nitrogen, phosphorus, and potassium. Miracle-Gro for flowers has a 15-30-15 ratio, meaning that there is 15% nitrogen, 30% phosphorus, and 15% potassium by weight.