hi
Have question regarding soil. In bonsai soil mixed can I used some garden soil too? Does it carry some importance or not
Need help.

Dev

In tropical climates we use 20% organic to keep moisture in the pot.

Yes you can, but it is not necessary. I use Akadama mostly it is free draining and holds moisture which is what is needed. Depending on the quality f your garden soil you could add some but I think it does not help much.