Compost is primarily used in the garden is to add organic matter back into the soil, replenish depleted nutrients, improve soil fertility and stimulate healthy root development in plants.
Further, in areas of heavy clay, the addition of compost can help break down the clay particles. In sandy environments, compost adds body to the soil and will facilitate water retention.
In all applications, the organic matter in compost provides food for microorganisms, which keeps the soil in healthy, balanced condition. Nitrogen, potassium, and phosphorus will be produced naturally by the feeding of microorganisms, so few if any, soil amendments will need to be added. However, we strongly recommend you fertilise your garden soil when planting and on a regular basis thereafter to ensure your plant investment continues to thrive.