San Pedro is easily propagated by taking at least a 2-3 inch cross section of a living SP cacti that is a thick around as possible. A piece taken like this looks like a star. Allow these pieces to dry out completely for 2-3 weeks in a warm place. Bury in sandy soil and begin a watering cycle of a full hydration once a month, or less if the soil hasn't dried. Allow more dry out time than you would during vigorous growth to allow for the extremely slow root growth. San Pedro loves/needs heat for vigorous growth, otherwise you get tall and spindly cacti. Once you have a strong cactus the san pedro can actually handle a great deal of water as long as intense heat/sun accompanies it. Good luck Derple.