Fertilizing regularly during the growth season is crucial for your Bonsai to survive. Normal trees are able to extend their root system looking for nutrients; Bonsai however are planted in rather small pots and need to be fertilized in order to replenish the soil's nutritional content.

 

 

Basic file parts of fertilizer

The three basic elements of any fertilizer are Nitrogen (N), Phosphorous (P) and Potassium (K), with each element serving different purposes. Nitrogen increases growth of leaves and stems (growth above ground), Phosphorus encourages healthy root growth and growth of fruits and flowers, Potassium promotes overall plant health. Sometimes different ratios of NPK are being used for different trees at different times of the year, though increasingly experts recommend using the same product throughout.

 

When should I apply fertilizer?

Most Bonsai trees should be fertilized during the entire growth season of the tree; from early spring till mid autumn.

Older and more mature trees are often fertilized less frequently, also depending on the species, the time of year, the stage of development and health of the tree. Indoor trees can be fertilized around the year. Although sometimes disputed, do not fertilize repotted trees for about a month; also do not fertilize sick treesCheck our care guides for specific information about when to fertilize per tree species.

 

Biogold bonsai fertilizer

Biogold is an organic fertilizer from Japan, often used for Bonsai trees.

 

Which fertilizer to choose?

It is important to choose the right fertilizer for your Bonsai plants and apply the right quantities. It is often recommended to use a fertilizer with a relatively high Nitrogen content in spring (something like NPK 10:6:6), a more balanced fertilizer (like NPK 6:6:6) in summer, and in autumn a low Nitrogen fertilizer (like NPK 3:6:6). Increasingly though, experts prefer to use a balanced fertilizer throughout the growth season, slowly decreasing the applied quanity towards the end of the growth season.

A few exceptions are worth pointing out: to encourage Bonsai to flower use a fertilizer with a high Phosphorous (P) content (like NPK 6:10:6) and for older trees you might want to use fertilizer with a slightly lower Nitrogen (N) content or reduce the quantity of fertilizer applied.

Although “Bonsai fertilizer” is fertilizer like any other, buying from (online) Bonsai shops will help you find the right NPK values. Biogold is a favorite product for many Bonsai enthusiasts, but any fertilizer with the right NPK value is perfectly fine. You can choose to use either liquid or solid fertilizer; which doesn't matter much, just follow the application guidelines as stated on the product’s packaging.

 

Fertilizer covers

Solid Bonsai fertilizer

Liquid Bonsai fertilizer

Liquid fertilizer

 

 

How to fertilize Bonsai trees?

Feed your Bonsai using the quantities and frequency as stated on the fertilizer’s packaging. You can choose to reduce the recommended quantity slightly for trees that are not in training anymore, to balance their growth instead of stimulating it. When using solid fertilizer it helps to use fertilizer covers, which make sure the fertilizer stays in place. Never overfeed your trees, as this will have serious consequences for their health.