Trichocereus Health: Recurring Tip Issues Need Photo Diagnosis

History

A Trichocereus peruvianus (San Pedro) has recurring black spots, squishy tips, and larvae. Owner treated with vodka mist, cut rotted tops, and regrew arms. Now 32" tall with persistent discoloration at new growth.

Pattern Suggests Seasonal Trigger

Both major episodes followed winter. Possible causes:

• Cold damage: Even brief chill causes delayed tip rot.
• Low light + water: Winter watering without growth leads to rot.
• Pathogen persistence: Fungus/bacteria in vascular tissue reactivates.

Next Steps

1. Email photos (whole plant, close-ups of spots, base) to gregandkat@msn.com.
2. Winter protocol: Keep dry (no water Nov–Mar), cool (50°F), bright light.
3. Spring restart: Water only after temps consistently >60°F and growth visible.
4. Preventive: Dust sulfur on cuts; avoid overhead watering.

Without photos, specific diagnosis is guesswork. The plant's firmness and 80% green color are encouraging.