Bunny Ears Cactus Information Bunny ears cactus (Opuntia microdasys) originated in Mexico and is a denizen of arid, desert-like areas. Growing bunny ears cactus is as simple as mimicking its native regional conditions. So if you have a dry, low humidity home and plenty of sunny exposure, bunny ears cactus plant might be the perfect plant for you.Read more at Gardening Know How: Bunny Ear Cactus Plant – How To Grow Bunny Ears Cactus