Grit, usually a mixture of crushed granite or flint, provides superb drainage whereas peat, typically moss peat, provides a springy earth compound, making for good aeration and supplying much needed Bonsai nutrients.
The grit and sand in the soil will dull the blade of the shear and they will then need to be sharpened more often.
However, many experianced bonsai artists find that a simple "chop-stick" works just as well as a root rake.
I'd define grit as any stone that would pass through a sieve with a 4mm mesh but not through a 2mm mesh. These larger stones keep the soil open and allow air to get to the roots.
4. Cover the grit with a layer of compost.
5. Place the soil warming cable in a zig-zag pattern across the layer of compost.
6. Pour in soil, until the box is approx 2/3 full.
1/3 sifted granite grit (GraniGrit Growers grade)
1/3 sifted premium pine bark mulch
1/3 sifted Turface or Profile Clay Soil Conditioner.
For Junipers and Pines, I add a bit more grit.
Four parts chicken grit + four parts forest mulch + one part peat moss. For acid-loving plants, switch the last two ingredients to one part mulch + four parts peat moss.
Cover the base of the pot (and drainage layer of grit if this is used) with a layer of soil creating a small mound where the tree is to be positioned so that when finally planted, it sits above the height of the rim.
Deciduous bonsai soil mixes should be "approximately" 60 percent organic material to 40 percent grit and an alternative soil for deciduous trees is the Japanese Akadama.
If you are compelled to mix your own soil, I am convinced you could do a lot worse than trying my "secret" recipe: 1 part (volume) Starter Chicken Grit (granite particles available wherever livestock feed is sold), ...
Whilst the organic component is normally sifted composted pine or fir bark, the inorganic component is any form of grit; sometimes this is crushed granite, coarse sand etc. small sharp pebbles, about 1/8 - 3/16 of an inch in diameter.
Hemlocks, for instance, are an evergreen needled tree that likes 70% humus and 30% grit, but the pines like even more grit than the 70%; purists in Japan grow pines in 100% sand. Find a soil that fits your watering schedule and your tree.
The standard bonsai mix that I prefer consists of equal parts grit, Japanese Akadama clay and a peat based compost.
He then uses a grinder with wire brushes, polishing grit , grit polishing discs and various sanding wheels to make the edges and surfaces smooth. .
Use a well draining mix, 1 part sharp sand, 1 part grit (6-10 mm), 1 part loam. The loam will keep the potting medium from completely drying out, while the sand and grit will allow for good draining and air circulation essential to fight root rot.
A free draining soil is important for all pines and should be 5 parts of grit of 2/3mm to 3 parts organic such as a mixture of peat, leaf mould or even composted bark.
Bonsai soil should be a mixture of humus and grit, with ratios being based on the type of Bonsai that you are caring for. For example, needled evergreen trees should have a ratio of 70% humus and 30% grit whereas other trees (more.) ...
By increasing the ratio of grit to the mix, the soil becomes increasingly free-draining; by increasing the amount of water-retentive material, the greater its water-holding capacity becomes.
Organic or Inorganic Soils ...
Incidentally, NEVER soak the nagura toishi, it will crumble into tiny pieces. Some people hone by using three or more grades (grit) of stones. I find this unnecessary.
Peat based compost - Loam - Horticultural grit - Perlite and a small amount of horticultural charcoal
Loxhore Mazurka. 6 years old
There are basically two ways of achieving this: ...
Top-dressing must be applied to kanuma or it will wash away during watering. Chicken grit, turkey grit or small crushed lava rock all work well. Chopped green moss may also be used.
high, drought ridden rocky slopes with strong, grit laden winds). We never see such examples in nature, so what would such a bonsai represent? The 'story' told by the shari would be incongruous with the nature of the tree.
I prepared a tray with a mixture of grit and sand and peat. The damaged bark was dusted in hormone rooting powder. The tree was then laid sideways and secured down in the tray still with the original root ball attached.
However it is far from being widely available to purchase online. It is a traditional volcanic grit and is often mixed with other soils. There are bags available with Kyodama and Akadama ready mixed if you look hard enough.
Early spring is a great time to do this and the gardener will need some good quality potting compost with a mix of sand or grit that will help the drainage.
Akadama 60%, peat soil 30% and kanuma 10%
Akadama 90% and kanuma 10%
Akadama 90% and peat soil 10%
Akadama 60%, peat soil 30% and sand (other grit 10%)
Akadama 90% and pumice 10% ...
Finally, put a thin layer of grit or sharp sand to keep the seed down.
7. Water carefully to avoid disturbing the soil bed and the seeds.
8. Place the pot outside for seeds that will germinate naturally.
Put plastic mesh on the drainage holes, attached with some copper wire, and cover the base of the pot with a layer of grit to create a good drainage.
6.
When we are confining the roots of a plant to a relatively small pot, the rots can soon reach a layer of coarse grit, granite etc. which holds very little moisture and nutrients.
"இங்-ிலாந்து" (In-gi-laan-dhu) (Tamil)
"Anh Quc" (Vietnamese)
"Inggris" (Indonesian)
"อังกฤษ" (Ang-grit) (Thai)
"英 蘭" (Y"nggln) (Chinese)
"잉글랜"" (Ing-geul-laen-deu) (Korean) ...
If used in this manner, the knob cutter should be protected by carefully avoiding blade contact with soil or anything else that might contain hard particles such as grit or stone.
But you always need some organic content and some grit for drainage. Drainage is important! Root rotting can become a big problem if your soil is not draining away excess water. I will give you my mix. It can be used for almost every out-door bonsai.
 See also: Bonsai, Plant, Tree, Growing, Species
  
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