When I dig a whole not deep enough for the length of the roots , I place the tree trunk at the edge of the hole then kinda let the roots do a semicircle in the hole on the outer edge .
I know it sounds confusing but I can't find better words
I transplant a lot of redbud trees and they have terribly long roots
I don't think ginkgo are terribly fussy
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Bonehead
Do you think your tree is a dwarf?
My tree is about 15' and 15 years old.