From Iowa state Uni -- US Rhubarb can be transplanted in early spring or early fall (mid-September through early October). Rhubarb does best in fertile, well-drained soils and full sun. The best time to transplant rhubarb is in early spring before growth begins. Carefully dig up the plant with a spade. Large plants may be divided into several sections. Each section should have 2 or 3 buds and a portion of the root system. Transplant each section into the garden with the buds 1 1/2 to 2 inches below the soil surface. Space plants 3 feet apart. Rhubarb also can be successfully transplanted in early fall. Fall planted rhubarb should be mulched with several inches of straw. The mulch provides additional time for the rhubarb plants to get reestablished before the ground freezes.

- Mike