Austrocylindropuntia subulata

Eve's needle cactus is a species of shrub or tree-like cactus that is native to the Peruvian Andes where it is valuable for erosion control and serves as a wildlife habitat for small animals and birds. It has long, slender stems with sharp spines and thrives in arid, desert-like conditions, and it is a member of the cactus family (Cactaceae). The epithet is Latin for "awl-shaped" and refers to the fleshy leaves.

This plant requires full sun or bright indoor light, good drainage, and infrequent watering. If used as a container or houseplant make sure the container or clay pot has adequate drainage holes. The recommended potting medium is cactus or succulent medium with added coarse sand, pumice, or perlite to promote good drainage. Water the plant well and allow the soil to completely dry out between waterings. This plant will not survive freezing temperatures or high humidity. It needs to be brought indoors before the first frost and placed in a sunny location. This plant is hardy in USDA Plant Hardiness Zones 9 to 11.

Eve's needle cactus may grow up to 13 feet tall in its native habitat, but is much smaller in cultivation. The trunk is erect and can measure up to 4 inches in diameter. It has elongated branches and cylinder-like joints that grow up to 2 feet long and 2.5 inches wide. It has ovate bumpy tubercles along the stems. The leaves are awl-like, fleshy, and greenish-yellow and can grow up to 5 inches long on a mature plant. The spined areoles have straight grayish-white spines that measure up to 3 inches long. Flowers bloom in the spring or summer, and they are tubular and may be yellow, greenish-yellow, orange-red, or red. The fruits produced are red and have fine stinging hairs.

This plant is low maintenance and thrives in arid-like conditions and requires very little watering. In warmer climates, it could used as an ornamental on a rock or succulent garden. For cactus enthusiasts, it could be used as an indoor houseplant. 

Insects, Diseases, and Other Plant Problems: Eve's needle cactus is usually resistant to most pests and diseases; however, monitor the plant for mealybugs and scale. Overwatering or inadequate drainage can result in root rot, and high humidity can causes stem rot. The cactus can suffer from scorch if exposed to intense sunlight. To prevent injury due to its sharp spines, it is best to wear protective gloves when caring for this plant. Avoid planting in walkways or areas frequented by children or pets.