Another Well-Balanced Cactus
This photograph also shows a spineless cactus in its first season. The manner of growth of this specimen is almost ideal. It spreads its slabs in such a way as to get the largest available supply of light and air for each, without mutual interference. Plants that take this form may be grown relatively close together, insuring a large production per acre.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 8 Chapter 6