
Threadgrafting is a process where a hole is made through the trunk and the the scion (new shoot) is then threaded through the hole and fixed into position - after exposing the cambium of the shoot.
As the scion and the trunk continue to grow they swell and are forced together; eventually grafting together.
This method is suitable for deciduous and broadleaf trees but not for coniferous species where complete defoliation of the scion will result only in the death of the shoot.
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