Propagating cane fruit

Something I both read somewhee and experienced growing raspberries is that when a cane grows long enough to touch down in the dirt, it will root and grow a new plant. Once it pushes out new canes, it can be cut off of the mother plant.

I have two blackberry plants I started last year and decided to try and force the propagation. Has anyone tried this?
The plants are just starting to bud and leaf out. Some of the leaves fom last year survived the winter and are coming back well.
Each plant had one really long cane and several shorter ones. So I bent the long canes over and stuck the end about 1/4" deep and wateed it in.
Let's see if this works. If it does, I just doubled my number of plants.

It should work. I have also done this with grapes. Another possibility is layering, mounding soil up at the base so roots grow on each stem.

Or place individual pot for each layering cane around the large pot. When the canes root successfully, you can just cut off the ends without disturbing the roots of both old and new plants.

So it's been about a month and I check them every once in a while. Today a slight tug told e they had rooted. So, I cut them off from the mother plant leaving two branches above ground.
I claim success and move on to the next challenge!