Grafting is usually done in the late winter months when the plants are dormant. When you graft a plant you remove a small branch (4 to 6 inches) from the desired variety, trim the end of the branch to expose the tissue under the bark and then trim a taper on the end. You then trim the seedling in such a way to match and receive the branch you are grafting on to it. Timing, temperature, and humidity are all critical to the success of the procedure, which is usually done in a greenhouse.