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.

Each peony should be situated so grafted sections of the plant are well below the soil, with the woody tree-like stems remaining upright. Chinese Tree Peony Deadheading and Pruning Like most ...

Tree peonies, Paeonia suffruticosa, are the taller, tree-like relatives of the much loved herbaceous peony famed for its brilliant spring blooms. Tree peonies should be thought of as small shrubs ...