A Sixteen Year Old Paradox
At sixteen years of age, Mr. Burbank's new Paradox walnut trees were sixty feet in height and as much in breadth of branches-the trunk being two feet in diameter at about four feet from the ground. Meantime English walnuts on the opposite side of the street averaged only eight or nine inches in diameter at thirty-two years of age, and had a spread of branches only about one quarter that of the youthful Paradox.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 5