The brain cactus (Stenocactus multicostatus) features distinctive wavy ribbing on its surface that almost looks like the folds of a brain, hence the plant’s common name. In fact, no two cacti have the same appearance to their ribs or quite the same shape, making each one unique. Overall, the cacti remain quite small with a fairly globular shape. They come in gray-green to deep green colors with brownish spines. In the spring and summer, they bloom with showy flowers that stretch about an inch across. The brain cactus is a slower grower that’s best planted when the weather has warmed in the spring. It can work for gardens in warm climates, as well as for growth as a houseplant.