Want to learn more about Bonsai soil
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Using the right soil mixture for your Bonsai trees is important since soils like all-purpose potting soil or other poor bonsai soils often retain water for too long and harden easily when they get dry, which makes proper watering very difficult for you.
A compacted organic soil that lacks structure also lacks aeration and drainage which deteriorates the overall health of your tree and could be fatal to your Bonsai.
When choosing a good Bonsai soil, it should include components like Akadama, Pumice, Lava rock, organic potting compost and fine gravel or grit.
Akadama needs to be sifted before use, and bear in mind that it takes about two years for it to start to break down, which reduces aeration.
Pumice is a soft volcanic rock that absorbs water and nutrients and also provides the soil with drainage.
Lava rock helps retain water and creates a good structure when used as part of a Bonsai substrate.
All-purpose potting soil retains too much water on its own and doesn't allow for proper aeration and drainage, but is great to use in a Bonsai soil mix.
Fine gravel / grit helps to create a well-draining and aerated Bonsai soil. It is also used as a bottom layer in Bonsai pots to enhance drainage.
Mix your own
If you want to mix your own Bonsai soil you can mix equal parts of: