Encouraging Branching on a 5-Foot Single-Stem Columnar Cactus

A 3–4 year cactus grew from 1' to 5'+ as a single stem. Some columnar species never branch—accept their form. To slow growth: slightly larger pot, careful watering. Could cut at the last large segment with sterilized knife—pups may form at callous. If leaning, pot at 1/3 plant height, wider, same soil line, stake till stable. Horizontal growth only by laying it down. Beautiful plant—love it as is.