Cleistocactus colademononis, Common Names: Monkey Tail Cactus Plant. This plant is known for its long, trailing stems covered in dense, white, hair-like spines, which give it a unique "monkey tail" appearance. The stems can grow up to 3 feet (90 cm) long, making it an ideal plant for hanging baskets or as a dramatic addition to succulent arrangements. In late spring to early summer, the Monkey Tail Cactus produces tubular, bright red flowers at the tips of the stems, attracting hummingbirds and other pollinators.