Fertilising bonsai is in fact not different than the way other container plants or ground plants are fertilised. Basically, bonsai trees are alike to their relatives in terms of their biological and chemical processes. The growth and development of bonsai trees depend on temperature, minerals, light, watering, pruning, and limitation of roots.
Fertilisers are often regarded a food for plants but carbon dioxide and water are the actually their real foods. These two elements together with sunlight are converted into carbohydrates and sugars which act as food for plants. Fertiliser acts more as vitamins, wherein the nitrogen, potassium, phosphorus, and other petty elements enclosed in it are essential for enzyme processes as well as cell division that allow growth along with photosynthesis to carry on. The basic fertilising plan is to start a few weeks after re-potting or soon after the first leaves begin to come out in the start of the growing season. Choose mild fertiliser at the start, and then advance to a balanced feed as the growing season continues. One should also stick with the fertilising plan to continually keep up with the plant’s growth. One must consider fertilisers which are high in nitrogen, which promotes foliage growth and greener leaves, potassium and phosphorus, which induces flower production. Organic fertilisers are more preferable than inorganic fertilisers as they only need natural bacteria to break them down.
There are also certain factors that should be considered in applying the fertilisers including the condition of the bonsai, the soil fertility, and label analysis of all fertilisers. Label analysis is important as it is how one determines the trace elements that are available which will suit bonsai trees in their growth.