The Triangle Cactus is a tall and unusual succulent that has become popular due to its resistance to low temperatures. It was first described by the famous Swedish biologist Carl Linnaeus in the middle of the 18th century under the name Cactus tetragonus, which existed until 1938.
Triangle Cactus, or as it is botanically called, Acanthocereus tetragonus, is a columnar plant that has thick stems and large thorns. The stems of this plant are a dark green color and have several angles, but not more than five. They have large and sharp spines that can grow up to 1.6 inches (4 cm) long, although they are not very numerous. These plants bloom several times a year with white flowers that have a yellow, orange, or red center. The unique thing about these flowers is that they only bloom in the evening and close completely closer to the morning.