Terry, I use the flexible PVC pipes that can be arched into hoops. These come in sold in 10-foot lengths and most in 20-foot lengths. You can also find garden hoops, also known as row cover hoops, or frost protection frames, at garden centers, online gardening stores, or even larger hardware stores. These hoops often come in various sizes and materials, including flexible plastic or metal, that can be adjusted or cut to fit your specific needs, like draping over taller plants or shrubs. As for heaters, I’m not personally experienced with using them, but you may find them online as well.