Cambium in the Forest Garden:

In order to accelerate the production of fruit trees, farmers often decide to graft them. This is a very difficult technique to successfully complete as the conditions and placement of the rootstock and scion must be perfect. One of the most critical steps when grafting is to align the cambium layer of the rootstock with the cambium layer of the scion. Since cambium is responsible for the transport of nutrients, if the layers are not well aligned, the graft will not take, and the scion will die off.