The hardiest of palms, Rhapidophyllum hystrix is a slow-growing Southeast US (Florida, Georgia, Alabama, and South Carolina) native that has withstood -9 degrees F here with NO damage (without protection or special siting). We expect established specimens should handle -20 degrees F. This short-trunked clump-former has typical cut-leaf, green palm foliage and sharp "needles" at the base to protect the seeds...very rare! In marginal climates, plant needle palms early in the season and protect them the first couple of winters until they become well-established. In colder climates, we recommend up-potting young plants and keeping them indoors until they are larger.