A Striking Contrast in Walnut Seedlings
Here are two seedling hybrid walnuts of the same age, grown from nuts of the same tree, and having had precisely the same care. They are second-generation hybrids, hence the wide variation in size and vigor of growth. One of these plants will grow into a gigantic tree; the other will remain dwarfed always. Obviously there are fine opportunities for selection among the seedlings of the hybrid walnuts.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 7