The Blue Flag
A prominent horticulturist has said that Mr. Burbank cannot keep his hands off any plant that comes under his observation. His every instinct calls out to him to test the plant and see what can be done to better it. This blue flag is an illustration of a flower that is being thus tested, probably without any very specific object. Not even Mr. Burbank can tell what unexpected variations may show themselves, offering material for interesting developments.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 5