Monstera care requirements
Symptoms to look for in Monstera
Roots and lower stem turn brown to black and feel soft or mushy, often with a sour smell from the pot; above soil, look for yellowing lower leaves and stunted new growth developing over days to weeks rather than overnight.
Common causes in Monstera
The Pythium and Phytophthora fungi behind root rot thrive in waterlogged soil — Monstera's need for a chunky, well-draining mix with perlite exists specifically to keep these fungi from taking hold, so root rot here is almost always tied to a denser mix or a pot without drainage holes.
How to treat root rot in Monstera
Remove the plant, cut away all affected roots with a sterilised blade, and repot into fresh, well-draining mix with extra perlite. A diluted hydrogen peroxide rinse on the remaining roots can help before repotting.
Preventing root rot in Monstera
Use a chunky, well-draining mix with perlite, ensure the pot has drainage holes, and let the top 2 inches of soil dry out between waterings.