The four-flap graft is successful because more cambium contact is made between the scion and the stock than with any other grafting procedure. The cambium is a green thin layer of cells located between the bark and wood, and is capable of dividing and forming new cells. The cambium contact between scion and stock is necessary for callus formation and a successful graft union. The biggest advantage of using the four-flap is the ability to graft small seedlings. Desired varieties should be collected while the wood is dormant, in January or February in New Mexico.
Young trees produce vigorous growth and are generally excellent sources of scion wood.
Collect scion wood from disease-free trees. Wax both ends, using either paraffin or wax to prevent drying out. Tie the sticks in bundles of about 25 each. Identify each variety with a tag or by some other method. Wrap scions in a wet newspaper or paper towels, then put into a plastic bag and seal.