7-foot and 4-foot cacti (likely Opuntia or Cylindropuntia) left out too long. Smaller shows brown frostbite.
Even experts kill cacti. Frost damage is common in marginal zones. Learn and adjust.
Follow-Up Care for a Toppled Columnar Cactus: Stabilization and Recovery
Reviving a Tall Cactus with Brown Sides: Dormancy vs. Decline
13-Year Cactus Turning Brown/Soft at Base: Cut Above Rot, Re-root
Yellowing Golden Barrels After Record Rain
Saving a Rotting Giant Cactus: Surgical Rescue
Identifying a Mystery Columnar Cactus
Fixing Severe Etiolation on a Tall Indoor Cactus ("Cactus Jack")
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
Prickly Pear Brown Spots: Scale Insect or Fungus
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