The "Crystal White," So Called
Mr. Burbank learned that a wild blackberry of New Jersey, pictured above, lighter in color than any other blackberry, had been introduced as a garden novelty under the name "Crystal White." Although lighter than any other blackberry, it was of a muddy brown color, as can be seen from the photograph; and the berries were small and of poor flavor. This wild berry, however, was the first step in the production of Mr. Burbank's perfected white blackberry.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 2