To fix root rot, you pull the plant from its pot and rinse the old soil off the roots. Then you cut away every dark mushy root, sanitize your tools, and replant in a fresh, free-draining mix. The whole job takes about twenty minutes. Move fast once you spot the problem. The rot spreads root to root while you wait, so the steps below walk you through each part.
Slide a sick plant out of its pot and you see the problem at once. Healthy roots are pale and firm and hold their shape. The rotted ones are dark brown or black, soft, and slimy to the touch, often tangled among the few white roots that are still alive. Some pull apart like wet thread. A sour, swampy smell usually rises off the root ball too. That mess is what you are clearing out.
Start by rinsing the roots under slow running water so you can see what is alive and what is gone. Then trim every brown or mushy root back to firm, pale tissue with clean scissors or pruners. Do not leave any soft sections behind, since rot keeps moving through them after you replant. This trimming is the core of how you treat root rot, because the dead tissue feeds the pathogen and starves the plant of oxygen at the same time.
Lift the plant out and wash the old soil off the roots under slow running water so each root shows clearly.
Trim every dark, soft root back to firm pale tissue. Sanitize the blade between cuts so you do not carry rot from root to root.
Use a clean pot with drainage holes and fresh mix with added perlite. Set the plant in and firm the soil gently around the trimmed roots.
Throw the old soil in the trash, not back in the pot. The water molds behind most rot leave behind resting spores that survive in soil for years, so reused mix just reinfects the new roots. Sanitize your blades before and after cutting. Soak them for at least 30 seconds in a 10% bleach solution or 70% alcohol, a standard from UW-Madison Extension. One quick swipe is not enough. The spores cling to the metal and ride your tools to the next plant.
The new home matters as much as the trimming. Pick a clean pot with drainage holes in the base so water never pools at the roots. Scrub an old pot with the same bleach mix first if you are reusing one. Fill it with a free-draining mix and stir in a few handfuls of perlite to open up air pockets. Roots need oxygen to recover, and a heavy, soggy mix is what drowned them in the first place.
Once you repot after root rot, hold back on water. Give the plant a small drink to settle the soil, then wait until the top inch feels dry before the next one. The trimmed root system cannot take up much yet, and soggy soil sends you right back to the start. Keep the plant out of harsh sun and skip fertilizer for a few weeks while new roots form.
You will see growers swear by hydrogen peroxide soaks or a dusting of cinnamon on the cut roots. These are common hobby tips. But no solid research shows they cure rot, so treat them as optional, not a fix. Save labeled fungicides for one case only. That is when a lab or extension office has named the actual pathogen. The wrong product on an unknown problem just wastes money. Clean cuts, fresh mix, and careful watering are what bring a plant back.
Read the full article: Root Rot: Causes, Signs, and How to Fix It
