Gardening & Landscaping Stack Exchange is a question and answer site for gardeners and landscapers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

What is a good generic bonsai soil mix?

What ratio of organic / inorganic material should be included?

share|improve this question
Here you can find extensive information on the subject. Pay special attention to the links provided in this post (in "Want to know more? Dig deeper into soil and it's composition by visiting these sites" section), as they contain not only various mix recipes but also detailed description what features are crucial for good bonsai soil composition and how different components affect overall growing experience. – leo Aug 28 '13 at 19:17

As I said in my answer to your earlier question about fertilizer, I'm not an expert in bonsai, but I have had a Chinese Elm and a Weeping Fig for many years; both are very healthy and, for most of that time, they have been growing in the following soil mix:

  • 30% grit, 70% humus

Clearly, soil needs vary a good deal from one species to another (conifers, for instance, require considerably more grit, as much as 70% for some species), and also depend on whether the tree is deciduous or evergreen.

There is some useful information about bonsai care and soil mixes, by the Royal Horticultural Society, here.

share|improve this answer

Soil mixes for bonsai are specific to the species of tree being considered as well as the location in which it will be grown.

I actually make a different mixture for each of my trees (well over 100) tho almost all of them are 100% inorganic. Usually I use 60% Akadama 40% crushed red lava with varying amounts depending on the tree. Some conifers get a little a small addition of composted Fir bark as well.

Depending on your area and your access to specialized soil components like akadama you may want to try using a different option like "oil-dri" or some other form of Diatomatious earth. There are even people using unscented kitty litter as an option. Basicly any hard clay particle will do.

A commonly quoted mixture in the US is by Boon Manakitivipart.

1 part lava rock
1 part pumice (which is lighter and holds less water than lava)
1 part akadama (which will break down in about 2 years)
1/2 cup horticultural charcoal (per 5 gallon mix)
1/2 cup decomposed granite (per 5 gallon mix)

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.