When used in a Bonsai soil mix, it helps to retain water and it aids the roots to ramify very well. Lava rock retains water and adds good structure when part of a Bonsai substrate. Roots can't grow into Lava rock. Organic potting compost includes peat moss, perlite and sand.
All plants, be it ordinary potted plants or bonsai, need a medium to grow. The importance of soil in bonsai cultivation is the single most crucial factor on which lies .
Selecting the wrong soil for a bonsai can have severe consequences. Alternatively selecting the correct soil and coupling this with good horticultural practice can .
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If you're getting bonsai soil you're either buying a packaged mix, or mixing your own bonsai soil. If you just want to know what to buy, try my best pre-packaged .
Through the soil in the pot, the tree must be able to obtain water, nutrients and gases in order to grow. For this reason, a bonsai must be planted in a good quality .