Roots of the Rhubarb
The Winter Rhubarb, like many other cultivated plants, does not always breed true from the seed, and it may best be propagated by root division. This is a very simple matter. however, nothing more being necessary than to cut the roots into small pieces, as here shown, and plant them. Of course the plant thus propagated reproduces absolutely the qualities of the parent plant. A garden plot may be rapidly stocked from a single root.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 6