Yellow Leaves Overwatering Root Rot on pothos
What's Happening
Chronically moist soil from watering frequency exceeding 7-10 day intervals creates anaerobic conditions below 2mg/L dissolved oxygen threshold. Pythium and Fusarium pathogens colonize suffocated feeder roots, producing enzymes that degrade vascular tissue. Blocked xylem transport triggers chlorosis—yellowing begins at leaf margins and progresses inward as nutrient flow ceases. The pothos' adventitious root system clusters at pot bottom, making it particularly susceptible to saturation in standard nursery pots.
How to Fix It
- 1
Unpot immediately and inspect root architecture—trim ALL black, brown, or mushy roots with alcohol-sterilized scissors
- 2
Treat remaining healthy roots with 3% hydrogen peroxide solution (1:1 with water) for 15 minutes to oxygenate and sterilize
- 3
Repot in fresh chunky aroid mix: 50% potting soil, 30% perlite, 20% orchid bark with activated charcoal
- 4
Allow soil to dry completely before first watering—wait until top 3 inches are bone-dry
- 5
Resume watering at 50% previous frequency—establish 10-14 day cycle based on soil dryness, not calendar
What You'll Need
How to Prevent It
Install drainage holes if absent. Use terracotta pots for natural moisture wicking. Insert wooden skewer to 4-inch depth—water only when skewer emerges dry. Bottom-water only when necessary to control saturation levels.
Related Problems
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