Opuntia is the largest genus in the cactus family. You will recognize most by their classic “prickly pear” appearance. There are many types of Opuntia cactus that are common houseplants and are known for their jointed stems and flattened pads. All varieties of Opuntia are easy to grow provided there is ample light, well-drained soil and warm temperatures during the growing season. In warmer climates, growing Opuntia in gardens adds desert appeal and unique flora to the landscape. For outdoor plants, choose a sunny location . Opuntia, once established, will tolerate as much water as necessary to keep pads from wrinkling.