San Pedro Yellowing in Phoenix: Root Damage from Record Rain

Diagnosis

One of three Trichocereus yellowing, leaning, ribs narrowing after record summer rain. Others fine.

Cause: Root Rot from Excess Water

• Phoenix got unprecedented rain.
• Roots drowned → can't support top.
• Leaning = loss of anchor roots.

Rescue

1. Stop all water (including drip).
2. Pot in shade (like expert did) – recovered in month.
3. Or wait in ground if drainage improves.

Lesson

Desert cacti in cultivation need rain exclusion during anomalous wet years.