NPK

Pick up almost any bag of fertiliser and the three letters ‘NPK’ will be listed as major ingredients. You may have to think back to high school chemistry to recall that these letters stand for the elements called nitrogen, phosphorus and potassium. These are the three major elements needed to fuel basic plant growth. While most fertilisers contain these three...

Fertilisers, also known as plant foods, come in a range of formulations including granular, slow-release and liquid. Which formulation you select depends on your garden size, storage facilities and ease of application.