Though there are a small number of Acer palmatum with this characteristic, the most vigorous and well suited to bonsai cultivation is the 'Arakawa'. This has light green leaves that turn yellow in Autumn.
To get really picky, the very best rough or cork bark black pines will be grown from cuttings so even the surface roots will show the corking. I have a rough bark Japanese Maple, Acer palmatum 'Arakawa' that has such corked surface roots (cutting ...
 See also: Plant, Japanese, Trunk, Graft, Bonsai
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