Short answer
Monstera deliciosa develops root rot primarily due to overwatering or poorly draining soil that keeps the roots suffocating in soggy conditions. The most effective fix is to remove the plant from its pot, trim away all soft or blackened mushy roots, and repot it into fresh, chunky, well-aerated aroid potting mix.
Root rot is a serious condition in Monstera deliciosa that typically presents as yellowing lower leaves that eventually turn brown and mushy, often accompanied by a distinct, unpleasant odor from the soil. Because Monsteras have thick, fleshy roots that require oxygen to thrive, prolonged waterlogging is a major threat to their health, but it is often reversible if caught before the stem base rots.
Monsteras need their soil to dry out at least two inches deep before receiving more water. Frequent watering keeps the soil constantly damp, depriving roots of the oxygen they need to prevent opportunistic fungal pathogens from colonizing the root system.
Check: Gently probe the soil 2-3 inches deep; if it feels sodden or cold, you are watering too frequently for your light conditions.
Fix: Adjust your watering schedule to wait until the top two inches of soil are dry and ensure the pot has drainage holes.
Many commercial potting soils are too dense and retain too much moisture for a Monstera. Without the addition of aeration amendments like perlite, bark, or charcoal, the soil packs down and suffocates the root mass.
Check: Check if the soil stays wet for more than 10-14 days after a thorough watering.
Fix: Repot the plant using a high-quality aroid mix containing plenty of orchid bark, perlite, and coco coir to improve airflow.
Using a pot that is too large for the root ball results in excessive soil that stays wet for far too long. The roots cannot absorb moisture from the periphery of the pot, creating a damp environment that invites rot.
Check: Look for a high ratio of soil to root mass; if you see very little root growth after removing the plant from the pot, the container is too large.
When to worry
You should be immediately concerned if the stem base (where leaves emerge) turns dark, soft, or mushy, as this indicates stem rot which is significantly harder to treat than root rot.
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Diagnose my MonsteraYes, you can trim off severely yellowed or dying leaves as they will not recover and only divert energy from the plant's recovery efforts. Use clean, disinfected shears to prevent spreading any potential pathogens.
If the main root system is entirely rotted but the stem is still firm, you may be able to salvage the plant by taking healthy stem cuttings and propagating them in water until new roots form. However, if the stem itself is rotting, the plant is likely non-viable.
A diluted hydrogen peroxide solution (1 part 3% peroxide to 2 parts water) can be used to rinse healthy-looking roots after you have pruned away the rotten parts to help kill lingering fungal spores, but it is not a substitute for proper soil and watering habits.
Consistent with guidance from: Royal Horticultural Society, University of Florida IFAS Extension.
Fix: Downsize to a pot that is only 1-2 inches wider than the root ball, ensuring it has adequate drainage.