Cephalocereus senilis, also known as the old man cactus or woolly torch cactus, is a striking member of the cactus family. It is native to Mexico and can grow to be up to 20 feet tall! The plant gets its name from its long, white, wool-like hair that covers the stems and flowers. This hair helps protect the plant from extreme temperatures and UV rays.
The old man cactus is relatively easy to care for. It does best in full sun but can tolerate some light shade. It needs well-drained soil and regular watering during the growing season (spring through fall). During the winter months, it is best to allow the soil to dry out completely before watering again. Be sure not to overwater this plant, as too much water can cause root rot.
This cactus produces beautiful yellow flowers that bloom at night and are pollinated by bats. After flowering, small red fruits will form which are edible but not very tasty!