Anyone can see why the mammillaria elongata cristata is also known as “Brain Cactus” – its dense oval stems closely resemble the squishy organ in our heads. Typically found in rocky outcrops of Central Mexico, the unusual plant thrives in the sun and never reaches heights above six inches. Yellow or brown spines cover the exterior, and it blossoms with flowers of the same color in the springtime. Brain cactus makes a popular houseplant, requiring little more than minimal water, porous soil with sufficient drainage, and lots of sunlight to survive. Display a Brain Cactus and you’ll be sure to grab the attention of curious house guests! Available on Etsy; $7.99.