Cactus Plants in the Nursery
Here the slabs originally planted have put forth several new slabs, showing that they have taken root and are thriving. The plants here are much too close together for permanent growth. At the end of the first year, the new slabs are used for transplanting at wider distances for forage or fruiting purposes.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 8 Chapter 6