It is my understanding that most roots will thicken faster if they are
buried than if they are exposed. Since thickening of the roots will assist
with thickening of the bottom of the trunk it makes sense that just barely
burying the base of the trunk will help fatten the trunk. Of course if you
bury too deep some trees will decide they are being ground layered and
sprout new roots - this can be either a good or a bad thing depending upon
the existing roots.

Marty



With most of the classical deciduous species, shallow boxes or
tiles beneath
the rootbole that force the lateral roots out builds girth very
quickly.


"Very quickly" being a relative term, of course. ;-)

************************************************** ******************************
++++Sponsored, in part, by Evergreen Gardenworks++++
************************************************** ******************************
-- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ --
+++++ Questions? Help? e-mail +++++