"Cut halfway, stick top in hole" – works for small cuttings, not 18-foot giants.
Cereus, Stenocereus, Pilosocereus root better than Carnegiea (saguaro).
Get pro assessment before cutting.
Rescuing a Stress-Damaged Columnar Cactus After Relocation
Removing Top Growth from a Tall Cactus
Treating Black Rot on an Old Man Cactus (Cephalocereus senilis)
Yellowing Base on Small Round Cactus: Rot or Stress?
Limiting Growth of a Tall Euphorbia Indoors
Rescued Tall "Cactus" Is Likely Euphorbia: Pruning & Rooting
Coral Cactus (Euphorbia lactea crest) Odd Growth: Graft or Sport?
Follow-Up Care for a Toppled Columnar Cactus: Stabilization and Recovery
Identifying a Mystery Columnar Cactus
Fixing Severe Etiolation on a Tall Indoor Cactus ("Cactus Jack")
Encouraging Branching on a 5-Foot Single-Stem Columnar Cactus
Trimming 8-10 ft Cacti Growing Through Patio Screen: Need ID First
20-Foot Cactus in New Hampshire: Won't Survive Freeze, Must Cut or Heat
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