Pruning Overgrown San Pedro Cactus Indoors

An 8-ft San Pedro (Trichocereus pachanoi) in a pot, too heavy to move outdoors in Pennsylvania, needs height reduction. Cut and reroot in same pot.

Cutting Plan

1. Cut both tall stems at 4 ft (remove top 4 ft)
2. Short stem: leave or cut back to 6"
3. Clean, angled cuts with sterilized saw
4. Callus all pieces 2-3 weeks

Replanting

• Original pot: base will branch at cuts
• Top cuttings: plant 4-6" deep around base
• Use cactus mix (70% mineral)
• No water 2 weeks

Indoor Care (PA)

• Winter: Cool (45-55°F), bright light, monthly water
• Summer: Outdoors if possible (acclimate!)
• Light: South window + grow light 12 hrs
• Pot: Heavy ceramic; wide base

Long-Term

Annual spring pruning maintains height. Each cut = branching = fuller plant. San Pedro responds vigorously to pruning.

If pot-bound, repot in spring before growth resumes.