Special Techniques: Dead wood workingMany bonsai specimens owe
their charming especially to the dried wood that furrows them with
a lively shari or exalted the foliage through many elegant jins.
They are parts of dried
wood that interest the trunk or the main branches, separating the sap
vessels. They can be natural or artificial. The natural ones
are frequent in specimens found in nature, even if it is possible to find
them also in nursery plants. In Asia they design future
bonsai-plants, making cuts in the bark and guiding the vessels path. If
you buy such a tree, you will have some advantages: you will have to
better define living and dead parts, without any great risks. As a matter
of fact, DIY and improvisations are dangerous: cutting an important sap
vessel can cause the death of the tree. The location of the vessel path
is very complex and for experts. The beginners would better follow the
already traced lines or ask to a master. The shari on the tree will be
cleaned with a brush or, if it is very delicate and friable, with
the help of a little paintbrush or some compressed air. In this way
you will remove fragments, soil, leaves or dried needles. Then you can
enlarge it, turning it towards a cut and transforming it into a jin
branch. If necessary you will strip the portion with a cutter.
Then, after cleaning it, you will apply some calcium sulphate that
protects the wood from rottenness and from the attack of microorganisms.
This Japanese word
indicates the hollow in a tree. It applies to conifers and
deciduous trees, giving them great dramatic power. The effect is amplified
when the residual part of the trunk is reduced to a thin layer covered by
corky bark.
They are wrecked
branches that tell about bad weather and adversities. The absence of
the bark and of the vital layer shows the dried wood, which become whiter
and whiter as the years pass. Bonsaists reproduce this effect by striping
the branch stumps and applying a sulphure-based liquid. However they are appreciated also in Japanese Prunus and in Mediterranean trees, such as Olives, Yews and Phirilleas. As a rule they are good for hard wood, resisting to the exposure to weather conditions. The lenght and the eventual movement of this part of the plant are important for the aesthetic according to the style: obviously the long and twisted jins would not suit a Formal Upright tree.
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