Repotting a 7-Foot Columnar Cactus Safely

How to Transplant a Large Spiny Columnar Cactus Indoors

Step-by-step guide for repotting a 7-foot columnar cactus in a 10-inch pot in Cincinnati (indoors).

Supplies

• Pot: height ≈ 1/3 plant height.
• Soil: well-draining soilless mix, slightly moistened.
• Rolled newspaper (to grip plant).
• Bamboo stakes.
• Plant stand on wheels (optional).
• Window screen for drainage hole.

Procedure

1. Enlist 1–2 helpers.
2. Fill new pot with mix to level where plant base will sit 1 inch below rim.
3. Wrap newspaper around plant at strategic points; one person holds via paper.
4. Second person cuts/breaks old pot away.
5. Lift root ball into new pot; hold steady while filling mix.
6. Tamp soil flush with base; stake if needed.
7. No water for 1 week; then drench. Bright indirect light.
8. Water only when soil dry. Mulch with gravel. Use skewer to test deep moisture.

Timing

Winter repotting is not ideal but doable; keep in active growth for root development.