Freeze Damage Recovery for Trichocereus and Echinocereus: Post-Freeze Protocol

Catastrophic Freeze Event in Potting Shed

Radiator failure causes freezing of established collection: Trichocereus spachianus, Echinocereus species, unknown flat yellow-spotted cactus, and Crassula (confirmed dead). Symptoms: soft tips, detached limbs, discoloration, drooping.

Immediate Triage

1. Remove all soft/drooping tissue: Sterile knife to healthy tissue
2. Fungicide dust: All cut surfaces
3. Crassula: Discard - non-cactus succulents rarely survive freeze
4. Maintain cool conditions: Keep in shed, no heat shock
5. Zero water: Until March minimum

Monitoring Protocol

• Watch "shadowy areas" on main stems for rot progression
• Any change = immediate surgical removal
• Spring repotting into smaller containers likely needed

Why Dormancy Helped

Plants were dormant during freeze - metabolic inactivity reduces cellular rupture. This is the only reason survival is possible.

Future Prevention

• Non-cactus succulents (Crassula, etc.) MUST come indoors for winter
• Monitor heating systems with alerts
• Consider backup heat source

Photo submission to moken_33@yahoo.com enables more precise guidance.