Fertilizers are divided into three categories: primary, secondary and micro-elements. In the first group are nitrogen, potassium and phosphorus, which generally the soil as without difficulty. The secondary elements are calcium, sulfur and magnesium, which are also usually found with ease on the substrate. Have the micro-elements are only needed in small quantities. However, they are also essential, because if missing, blocks the absorption of both elements the primary and the secundary.
To keep your plants healthy and beautiful, you should apply these fertilizers regularly, both in summer and in winter. Like that, your garden will receive all the necessary nutrients. Another useful information is to use humus to give the soil a spongy texture.