A Briar Patch at Sebastopol
The plants included in this view are quite literally "too numerous to mention." But it will be of interest to note that three or four conspicuous clusters of foliage in the middle ground represent groups of thornless blackberry bushes. These plants take on a vine-like growth, and in many cases the tips of the "vines" have been covered with earth that they may take root and form new plants.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 3