A cleft graft is one of the grafts used for topworking new cultivars on existing trees.
It is used for relatively small branches and done when the stock is dormant and cracks easily.
Two scions are inserted on either side of the branch and the cambium lined up along the outer edge.
When the tool is released, the pressure of the closure holds the scions in place.
Once the graft takes, only one of the scions will be retained.
Sometimes the other scion is left for a while as a nurse branch
Kiwi is an exception where two vines are left per graft.
Insert movie here
Click on the image to see the movie