Root Rot on monstera adansonii
What's Happening
Monstera adansonii develops root rot when epiphytic aerial roots are confined in dense, moisture-retentive potting soil for 7+ days without oxygen exchange. The root system's native adaptation to clinging bark and rapid drainage creates vulnerability to anaerobic bacterial proliferation (Pythium, Phytophthora) when soil remains saturated below the surface. Unlike visible wilting from underwatering, root rot produces telltale early signals: subtle basal leaf yellowing, slowed new growth, and a musty odor from the soil that appears dry on top.
How to Fix It
- 1
Gently unpot and inspect: Healthy roots appear white, firm, and rope-like; rotting roots are brown/black, mushy, and detach easily
- 2
Trim all affected roots with sterilized scissors, cutting 1cm into healthy tissue to ensure complete removal
- 3
Sterilize remaining root mass: Soak in 3% hydrogen peroxide solution (1:1 with water) for 15-20 minutes to kill pathogens
- 4
Allow cut surfaces to callus for 48 hours in bright indirect light to seal wounds against reinfection
- 5
Repot in completely dry, chunky aroid mix; do not water for 7 days to allow root recovery
How to Prevent It
Water only when the top 2 inches of soil are completely dry; use well-draining aroid mix (50% potting soil, 30% perlite, 20% bark); match pot size to root ball (roots should fill 70-80% of container); elevate pot on feet to improve drainage; avoid automated watering systems that maintain constant moisture.