Cactus Plants of the Newest Generation
The cactus seedlings in this bed are the best examples of spineless cactus of the most recent generation, except, indeed, those that have broken soil in the present season. It will be some time before these plants reach the fruiting age, but Mr. Burbank believes that some of them will then bear fruit that is entirely spineless. The slabs themselves are of course already as smooth as could be desired.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 2