Large Cactus with Dry Brown Spot: Replanting Risks Shock; Cut Below Spot If Spreads

8-Ft Cactus, 15 Years Old, Small Bowl, Never Repotted—Dry Brown Spot Growing

Owner asks if repot in bigger pot, what to do with spot.

Don't Repot If Sick—Shock Risk

Greg: single or multi-stem? White sap = Euphorbia (toxic). If spot grows, cut 6" below at angle so water runs off. Healthy plant branches from cut.