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From among various modeling techniques, the most usual is the laying of wires (blasting).
This technique consists of winding wire around the back of the plant, so that we can then model it with the desired shape, the pistol remains padded the necessary time until it reaches the desired position without requiring the wires.
Contrary to what many people think the wires do not prevent the growth of the plant, pure and simply force it to grow in the desired position, being sometimes necessary to remove them (before creasing the leg) and put them back again until the desired shape is obtained.
The aramment is used in the transformation of “Potensai” (Potensai potential – species that gather the necessary characteristics to be Bonsai) into “Pré-Bonsai” (phase in which the technique has already been applied but which has not yet completed the process) and in the aesthetic improvement and recovery of Bonsai.
This process may apply to all Bonsai species, and certain rules must be respected.
Although there are specificities for species, the ideal breeding season is throughout the plant's growing season mainly during spring and autumn.
The winter height is delicate for laying of wires as there is little flexibility in the plant which increases the risk of breaking branches, in summer it should still be especially careful with the high fluidity of the sap (mainly in Pinheiros), which when being conditioned by wires can lead certain legates to dry or to internal rocks.
In order to finish we should pay special attention to the trees in the autumn, because there is a time when a rapid thickening of the branches can cause creases in the bark, we should never crush weak trees because we could weaken them more.
The crushing techniques are several being able to use one or more wires per leg (simple coat), which should be placed parallel and together, the wire should be placed slope to the skin of the plant without always creasing at 45 degree angles, we can still use a single wire that two legades (double coat).
The wire used is aluminum wire that takes a copper bath so that its color does not highlight, this Japanese source wire exists in different calibers from 1mm to 6mm with 0.5mm intervals, as main features it does not react with the plant (such as the rust iron or the copper that gains green), it is extremely flexible being able to easily be molded, removed and reused.
In conifers it can also be used disastrous copper wire, which is harder, achieving folding stronger legages with smaller thicknesses, which becomes important mainly at the ends of pines, to pass between the needles, given the resistance also becomes more difficult to work requiring more practice.
In addition to the crushing there are other modeling techniques such as the placement of “pulled” wire (or other material), the placement of weights, the placement of “tensors” proper to Bonsai that gradually force very thick legages in which one cannot use wires, this forcing can be to create or correct curves.
Whenever we are working with a sensitive shell plant or we intend to force the plant a lot, we may involve the rama with damp grass (or other material that protects the legade) before we put the wire.
In any case, it is always important to emphasize that the straining technique emerged in the last century and that Bonsai has more than 2000 years, so the basis of modeling consists in the utilization of the natural forms of the plant and in the pruning with foresight and knowledge of the natural form of budding of the species.