Graft union

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1. the region where rootstock and scion come together; there can be slightly deformed growth at the union that is noticeable, but does not effect the function of the tree.

graft-collar-338x600.jpg

The deformity shown in this image is the graft union region on a tree trunk.
Source: https://www.gardeningknowhow.com/ornamental/trees/tgen/what-is-a-graft-collar.htm

Typical-Grafted-Plant.jpg

This diagram shows a typical grafted plant.
Source: http://www.vnrnursery.in/pop-removal-of-tape-from-graft-union/