Ensure your plants have the correct balance of soil. This is very important to some plants. Test for pH, N, P and K in your soil.
Nitrogen (N) - This is essential for the growth of vegetation especially grass and leafy plants. The correct amount allows for healthy growth, too much and the plant's structure will be damaged.
Phosphorus (P) - This nutrient is necessary for strong root growth and root vegetables. It helps in the formation of buds and healthy stems. A lack of phosphorous will stunt the growth of a plant.
Potassium/Potash (K) - This nutrient is important in the development of flowers and shrubs. The correct potassium levels ensure that flowers become more fragrant and have improved colour. In vegetables it ensures a better quality crop and also makes plants more resistant to disease.