Many Plums on One Tree
A typical branch of a plum tree in Mr. Burbank's orchard. Growing within easy reach are four or five varieties of plums that are very different from one another in size and form and color, as well as in quality of flesh. Of course these plants are of quite different ancestry, and they would not have grown normally on the same tree. But Mr. Burbank grafts cions of many stocks on the same branches, to economize space. Several hundred varieties may be found growing from a single trunk.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 4