As long as the organic matter particle size is not too small, and the amendment is thoroughly incorporated, clay soils are improved by 'aggregation'.
Loam - a soil mixture comprised of clay, sand and organic matter.
49. Mame - a term used in size classification of bonsai trees; this being a small bonsai.
50. Moyogi - a traditional Japanese bonsai style; also called informal upright.
Peat - Partly decomposed organic matter, originating from the decomposition ofvegetation in bogs, marshes or heathland. As an ingredient of potting soil, peatassists in moisture retention.
Partly decomposed organic matter; when it is used as an ingredient of
potting soil it assists in moisture retention.
Perlite
A form of volcanic rock that is heat treated to develop a lightweight, coarse ...
Combining the right amount of organic matter (nutrients and moisture retention) and inorganic components (which provide for good drainage and root development).
When it reaches our newly planted tree surrounded by loose organic matter, it is going to seep in until the planting hole is completely full of water.
Often provided by the use of dead organic matter/ Humus, the soil needs to be able to hold and retain sufficient quantities of water and nutrients for the tree to absorb.
Good drainage.
Organic fertilisers, like humus, leaf compost, manure, bark release these chemicals slowly to the plant as the organic matter decomposes. Inorganic fertilisers release these nutrients "faster" to the plant.
In the wild, trees grow vigorously due to naturally evolving soil, gaining strength from decaying plant and other organic matter. In your pot, at home, you cannot replicate this as your bonsai's environment will be controlled.
All organic soils have a stock of these vital chemicals; they come from the mineral part of the soil (sands/clays etc) and from dead organic matter (fallen leaves and dead plant matter).
Some trees like maples need a lot of moisture and so you will want to have a bit more organic matter in it.
to add organic matter and nutrients to the soil through the gradual breakdown of the mulch material
to repel insects ...
Well drained soil high in organic matter with soil pH between 5.0 and 6.5 should be used. The roots are superficial and fine, so drastic root pruning is not recommended, and it is best if only 10% of the roots are removed.
Soil should be coarse and fast draining, but still contain some organic matter.
If the style deserves a shallow container, this is a plant that does well in modest amounts of soil.
Repotting: Jades should be repotted into fast draining inorganic compost every 2-3 years. A mix of 75% inorganic matter (grit) and 25% organic (peat compost) is an ideal combination having good drainage whilst giving a degree of water retention.
Adding Soil: Adding the right soil is important when growing Japanese White Pines. Start with fertile workable soil that consists of a mixture of clay, sand, silt, and some organic matterial.
It follows from the foregoing that the soils used for bonsai culture should contain some sand, some organic matter, and some liquid retaining material. A good mix suitable for nearly all bonsai would be: ...
 See also: Organic, Plant, Bonsai, Growing, Tree
  
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