Full article linked at Dave’s Garden site
Tough and rugged, the Eastern Prickly Pear cactus is hardy throughout most of North America. For those who would like a garden with a Southwest theme, this cactus would be an excellent choice. Opuntia humifusa is hardy as far north as zone 4 (-25F or -36.6C) and as long as it is planted in a well-drained area, it should thrive. It can spread into a huge mass if planted in favorable conditions, so give it plenty of room if you do not want to transplant it later. The Eastern Prickly Pear produces stunning yellow blossoms and red fruits for additional textural interest as well. Prickly Pear is easy to propagate. Break off a pad and let the end heal over for a day or two, then plant it in soil amended with fine gravel or sand. It does best in full sun conditions, but can tolerate some shade. For northern gardeners who like something a bit different, the Opuntia humifusajust might be the ticket.