How To Care For Old Man Cactus. With the right conditions of a hot dry and sunny setting cephalocereus senilis makes a great houseplant as well as a unique conversation piece in any cactus garden. Peruvian Old Man Cacti also called Snowball Cacti or Cotton Ball Cacti are easy plants to care for.
A drier environment is preferred. Use a well-drained soil. Place it in a window with direct sunlight and use a grow lamp if needed.
Old Man Cactus Growing Needs.
A drier environment is preferred. Use a well-drained soil. Humidity is not critical. Senilis will also need protection from frost so most outdoor growers use lightweight materials like Styrofoam cups to cover the delicate tip.