What soil should I use?
Bonsai do well in granular soils like akadama mixed with drainage like Terrabonsai. The ratio varies by species, but in principle the akadama is poured in a layer at the bottom of the pot (50% full) to create good drainage. The second layer, of Terrabonsai, in which the roots will develop further.
The akadama is the best-known substrate for bonsai, either alone or mixed with other substrates (kanuma, terrabonsai…). The properties that make the akadama a very interesting product to grow bonsai are both its good drainage (its roots will be better oxygenated) and its resistance to degradation.
Tierrabonsai is made up of blond peat, akadama and volcanic stoneware. With the mixture of the different components an optimal substrate is obtained for beginner hobbyists; the perfect combination between air and water retained by the substrate gives the possibility of not being excessively dependent on watering, since it retains water well.
Another substrate to consider is kanuma (pH of 4). Suitable for growing bonsai that need an acidic substrate, mainly azaleas (rhododendrons) and some conifers.
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