I was talking to my mom today when splitting a bunch of gifted rhubarb plants, and told her that my comfrey splitting sized (2 knuckles for someone 6') rhubarb plants took off very well, and she looked at me strangely. How small do you cut your rhubarb roots when dividing them?
On a side note the rhubarb patch that I'm making is covered by wood chips, and very little grass about 1' above ground that shakes if you throw an 8' cedar tone 4x4 bird house post from your shoulder onto the ground.
You can eat anything once, sometimes more than once.
One bit.. so one bud and anything that is attached directly to it, maybe about 8 inches round? Each plant is about 1.5ft round when I split them and I split them into 4's normally. I don't generally want more rhubarb just refreshed
We also had a large rhubarb root mass gifted to us in the middle of last summer. My friend was moving and wanted to preserve a rhubarb plant that had, in various places, been in the family for several generations, and he was not moving somewhere he could plant it. The clump was smaller than the large pot in the youtube video and we split it into 14 clumps, some of them quite smallish. They are all booming this year, outperforming our original rhubarb patch! Spring and fall may be better, but we did it when it was available, in the heat of summer, and it worked too.
I’m not sure what the proper size division is, but this spring I split 12 small plants off one large plant. I just split root fragments from around the outside of the large plant and then another from the centre of it. Each root piece ended up 4-8” long. All of the new plants are thriving and the remaining large plant is bigger this year then it was the year before I split it!