A range of fertilisers and soil additives - in prepacked 3kg bags &10Kg tubs. Some show their NPK value eg 5-10-5, NPK stands for nitrogen, phosphorus, and potassium. This refers to a percentage, by weight, of these three major nutrients in the fertilizer product. If you purchase a 3Kg bag fertilizer labelled 5-10-5, it contains 5 percent nitrogen, 10 percent phosphorus, and 5 percent potassium by weight. The remaining 80 percent of the bag's weight is comprised of other minor nutrients or fillers. Nitrogen encourages foliage growth, among other benefits. Fertilizers high in nitrogen are often used for grass or for other plants where green foliage growth is more important than flowering. Phosphorus contributes to many fundamental plant processes, such as rooting and setting flower buds. Potassium contributes to the overall health and vigour of plants.