Why Do Bonsai Need Fertilizer?
Bonsai containers are a man-made environment. As such, they require you, in order to maintain the health and development of your bonsai, to provide, in addition to frequent watering, a regular dose of fertilizer to the soil or growing medium.
What Type Of Fertilizer Should You Use?
Feed your bonsai with a balanced fertilizer, 20-20-20, at quarter strength, every other week. The numbers 20-20-20 are the percentage, by weight, of the N-P-K (nitrogen, phosphorus, and potassium) contained in that fertilizer. These elements, in addition to minor or trace elements, are necessary for cell division and enzyme processes that allow photosynthesis and the resulting growth to take place.
What Does N-P-K Stand For & What Does It Do?
N - Nitrogen is responsible for the size and amount of new growth and, to some extent, the green color of the leaves. Nitrogen is required for cell division and, also, protein manufacturing. P - Phosphorus is also necessary for cell division and is associated with good root growth and flowering. K - Potassium activates cell enzymes and is related with overall healthy cell activity.
Bonsai Fertilizer Notes
Always water your bonsai thoroughly before fertilizing and never use fertilizer on a dry tree.
Never fertilize a sick tree, as fertilizer is not medicine.
When you have finished a bottle of fertilizer, it is a good idea to purchase a different brand, as they all contain different amounts of trace elements and minerals. Exposing your bonsai to different amounts of these important trace elements and minerals is very beneficial.
If you are not sure how much fertilizer to use, follow the directions on the label and never use more than recommended.
Fertilizer is a good thing, but too much is a bad thing.