Answer: Prickly pear cactus (opuntia polyacantha) is certainly hardy in your area, as would others such as pincushion or ball cactus (mamillaria vivipara,) Coryphantha, Echinocereus, Pediocactus and Neobesseya. These plants do best in full sun and well drained soil as would be found on a slope or perhaps in a raised bed. The drainage is probably most important during the winter as excess moisture then will cause them to rot. Another caution in siting these types of plants is safety -- children, pets and just as important in my experience, absent minded gardeners are all at risk from the spines.
Q&A Library Searching Tips