You Will Get 10 Seeds Opuntia Bentonii Prickly Pear Cactus. This great cacti forms large flat pads that are green, they and bloom with yellow flowers.. These plants are extremely exotic, yet they are very cold hardy.. They are hardy to at least USDA zone 6, and possibly colder.. These plants would make excellent additions to your rare plant collection, or just make a unique statement in your yard.