That scar is an artifact of a process called grafting, or fusing two separate pieces of wood into a new tree. From citrus to peaches, almost all fruit trees are grafted, and so are pecans.

Onalaska High School natural resources students had an opportunity Wednesday to learn a practice utilized by fruit growers for thousands of years: tree grafting. "We're basically making clones," said ...

Pear, plum, fig and medlar trees can also produce good results ... tree to another recommended for growing fruit. This is called grafting, allowing you to benefit from the healthy rootstock ...