Red Apple Ice Plant Collapse: Water Management and Recovery

JH's ice plant (Aptenia cordifolia) in San Diego turned brown, smelly, and slimy after rain following irrigation. Hillside planting, well-drained soil. Fertilizer and fungicide failed. Dieback spreading.

Cause: Waterlogging in Succulent

Ice plants are xerophytes—adapted to dry conditions. Even on slopes, prolonged wetness causes root rot (Phytophthora, Pythium) and stem rot. The "mildew smell" and slime confirm anaerobic decay.

Emergency Protocol

1. Remove ALL dead/dying tissue: Bag and discard. Cut back to healthy, firm stems.
2. Stop all irrigation: Let soil dry completely. Succulents tolerate drought far better than wet.
3. No fertilizer: Aggravates stress.
4. Optional: Fungicide drench (e.g., fosetyl-Al, phosphonates) labeled for succulents—limited efficacy once rot is advanced.

Recovery Outlook

If healthy portions remain and soil dries, plants often resprout from crowns. Pathogens may linger—monitor for recurrence. If loss is total, consider more moisture-tolerant groundcovers (e.g., Dymondia, Sedum).

Prevention

• Irrigate infrequently, deeply.
• Ensure rapid drainage—amend with coarse sand/pumice if needed.
• Turn off irrigation before rain events.