I remember when I first started into bonsai how hard it was for me to find out what was in bonsai soil. Recipes were scarce and no one had the be all, end all mix. However as I got more involved and understood what goes into making the soil it made sense why it was so different. Everyone seems to have their own mix and use different ingredients for one reason of another.
Bonsai soils are soil less as they contain no top soil, or sand. Bonsai mixes are developed based upon the results that bonsai artist want to achieve. These specifics are good drainage, water retention, and sharp aggregate. In the following video I review the different types of materials I use for making my bonsai mixes and the reason I use them.