double working

The use of three grafted parts to make a tree, the rootstock, interstock (which forms the lower part of the main stem) and scion, instead of the more usual two (rootstock and scion).

graft incompatibility,
grafting,
interstock (interstem),
main stem,
rootstock,
scion

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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