Uro

I use uro extensively on yamadori (collected) Hawthorn where it is often necessary to remove large branches but the production of scar tissue and wound healing is poor.

Uro - A deep hollow in a tree where in nature rot has removed parts of the trees heartwood. Particularly common and very attractive feature when seen on deciduous trees.
Uro or natural hollows in the trunk of various trees.

URO A carved (or natural) deadwood hollow, often seen on (but not limited to) deciduous trees.
UNDERWATERING Where a tree is allowed to dry out or is not watered thoroughly when required.

Uro style.
In deciduous, broad leaf tree species such as maples, the jin style isn't so appropriate. This is because these type of trees usually allow dead portions of the brach to fall away.

Bonsai Glossary: uro - A carved or natural trunk recess area, at the point where a branch has been removed.
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See also: Bonsai, Species, Trunk, Tree, Bark