Vickie, I would think a smaller hoop would work on peonies. You can make them to the size you need using a flexible PVC, ABS, or pex pipe and a straight connector. Any of these are available at a Lowes, HD, or Ace hardware. Just remember that you need 3.25 times the pipe as the intended diameter, such as 1' hoop would need 3.25' of pipe.
