Finding the right fertilizer can sometimes be difficult. The big three ingredients of plant nutrition are nitrogen, potassium and phosphor known as N-P-K. The next important ingredients are carbon, hydrogen and oxygen which are obtained through the atmosphere through its roots and through its leaves. After that there are about ten other nutrients including calcium, chlorine, copper, manganese, iron, and zinc and these are trace elements found in most soils. Finding the right balance is essential. Nitrogen encourages the growth of greenery, phosphorus works to develop strong roots and potassium encourages the production of flowers. The numbers on the product for instance 25-20-5 refer to the percentage amounts of N-P-K in the product.