Blue Myrtle Cactus Plant Myrtillocactus geometrizansThe blue myrtle cactus plant, also known as Myrtillocactus geometrizans, is a unique and attractive succulent native to Mexico. It can reach up to 20 feet tall in the wild, but typically grows to around 6 feet in cultivation. The blue myrtle cactus has a distinctive blue green color and is covered in spines. It has a columnar shape with multiple branching stems and can develop a woody trunk over time. The plant produces small white or yellow flowers