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A Bed of Burbank Calendulas

Here we observe remarkable variation in color, size, and fullness of flowers. There is almost boundless opportunity here for experiments in selective breeding. It would be interesting to see how many types of new varieties of Calendulas could be developed from this single bed.

A Bed of Burbank Calendulas

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 10 Chapter 1