Root rot starts in a pot that stays wet. The roots run short of air and begin to die, and water molds and fungi that live in soil move into the weakened tissue, mostly Pythium, Phytophthora, Rhizoctonia and Fusarium. Dead roots can't take up water, so the plant wilts as if it were dry, and it's tempting to water it again.
Roots that have rotted won't come back. You can still save the rest of the plant: the firm roots that are still alive or, if there aren't enough of those, a healthy stem to start over from. The sooner you look, the more you have to work with.
Make sure it's rot before you start cutting
From above the soil, root rot looks like a lot of other problems. The usual signs are wilting while the soil is still damp, yellowing leaves (often the lower ones first), growth that has stalled, and sometimes a stem that has gone dark and soft at the soil line. Overwatered or underwatered? goes through how to tell from the outside. The only sure test is the roots themselves.
Tip the pot on its side, hold the base of the stems between your fingers and ease the plant out. Shake or rinse off enough mix to see the roots.
| Check | Healthy root | Rotted root |
|---|---|---|
| Feel | Firm and springy | Soft, mushy or slimy |
| Color | White, cream or tan | Brown, black or reddish |
| Smell | Earthy, or nothing | Sometimes sour or rotten |
| Pull gently | Holds together | Outer layer slides off, leaving a thin thread |
Healthy root color varies between plants (dracaena roots are naturally orange), so where color and feel disagree, trust the feel. A firm root is alive. That thread left behind when the outer layer slips off is a classic sign of root rot, often the kind caused by Pythium.
Moth orchids are a special case: their healthy roots are green or silver, and they grow in bark. The orchid article covers reading and trimming their roots.
The rescue, step by step
You'll need clean, sharp scissors, fresh bagged potting mix suited to the plant, and a pot with a drainage hole. Wipe the scissor blades with 70% rubbing alcohol before you start.
- Clear off the old mix. Crumble away as much as you can, then rinse the roots under lukewarm running water so you can see every one. Bag the old mix and throw it out. It carries the organisms that caused the rot.
- Cut out the rot. Trim each soft, brown root back to firm, pale tissue. If a root is rotten along its whole length, cut it off where it joins the plant. Be thorough. Leaving rotten pieces behind gives the rot a head start in the new pot.
- Press the base of the stem. Where the stems meet the roots should feel firm. If it's soft, dark or mushy, the rot has reached the crown, and the section on cuttings and division below is your better bet.
- Take off damaged leaves. Remove any leaves that have gone yellow or mushy. If you've cut away most of the roots, take off a few healthy leaves too, so the roots that are left have less to supply. Keep the leaves that are still mostly green.
- Repot into a smaller pot. Pick one only just big enough for the roots you kept, with a drainage hole. Mix that no root reaches stays wet, and a small root system in a big pot of wet mix is how this started. Skip the layer of gravel at the bottom. The drainage hole and a free-draining mix do that job. Fill in around the roots with fresh mix and firm it gently.
- Water once, or wait. Advice splits here. Some growers water once right away until it drains, to settle the mix around the roots, and others wait a few days so the cut ends can dry. Either works for a leafy houseplant, as long as the mix drains freely and you don't water again until it has dried down.
- Clean up. Pour away any water that drained out, and don't use it on another plant. Wipe your scissors and work surface with rubbing alcohol. If you want to reuse the old pot, wash it in soapy water, soak it for at least 10 minutes in one part household bleach to nine parts water, and rinse it well. Some plant clinics go further and say to throw out plastic pots that held a rotted plant, because they're hard to disinfect properly.
Succulents and cacti, snake plants and ZZ plants included, are the exception at steps 5 and 6. Let the trimmed roots dry in the air for a day, repot into dry, gritty mix, and wait a week to ten days before the first watering. How often to water succulents covers the routine to follow after that.
How much root is left decides what you do
| After trimming | Outlook | What to do |
|---|---|---|
| Most roots firm, a few soft ones cut out | Good | Repot smaller, as above |
| A lot of root gone, stem base still firm | Uncertain | Repot smaller, remove some leaves, and take a cutting or two as backup |
| Hardly any firm root left | Poor | Take cuttings from healthy growth |
| Stem soft or dark at the soil line | Very poor | Take cuttings from well above the rot, divide off a healthy section, or throw it out |
Be honest with yourself about the bottom rows. Plant pathologists put it bluntly: once rot has spread through most of the roots, saving the plant is uncommon, and throwing it out is often the cheapest and most sensible fix. That's especially true for an inexpensive plant you could replace.
Starting over from cuttings
Rot works upward from the roots, so stems and leaves well above the soil are often still healthy when the roots are finished. Root a piece of that growth in clean water or fresh mix and you have a new plant.
For plants with stems, cut a piece 3–4 inches (8–10 cm) long from the tip of a firm, healthy stem, just below a node (the bump where a leaf joins the stem). Look at the cut end. It should be clean and evenly colored inside. If it's brown or streaked, cut higher. Strip the leaves off the bottom inch or two and stand the cutting in water or in damp, fresh potting mix. Most houseplant cuttings start to root in two to four weeks. When a gentle tug meets resistance, roots have formed.
How easily this works depends on the plant:
- Pothos, philodendron and tradescantia root readily, in water or mix.
- Snake plant grows from sections of leaf a few inches long. Keep track of which end pointed down, because that end has to go into the mix. Let the cut ends dry for a day or two before planting.
- ZZ plant grows from single leaves or leaf stems pushed into mix, but it's slow. Expect to wait months for a new shoot.
- Succulents root from single leaves or stem pieces. Let them dry for a few days until the cut end calluses before you set them on mix.
- Peace lily, calathea and other plants that grow from a clump at soil level have no stem to cut. The only option is to split off a section that still has firm roots attached and pot that up by itself. The peace lily article walks through that case.
Aftercare for the next few weeks
- Light: bright, indirect light. Light helps the mix dry out between waterings, but keep the plant out of direct sun while it's struggling.
- Water: only once the top inch or two (2.5–5 cm) of mix is dry, or the whole pot for succulents, snake plants and ZZ plants. Never leave the pot standing in water in a saucer or decorative outer pot. Lift the pot after watering so you learn what wet feels like, and a light pot will tell you the mix has dried.
- Fertilizer: none until you see new growth. Damaged roots can't use it, and the salts can burn the new ones.
- What to expect: some more drooping and a leaf or two dropping in the first weeks is normal. New leaves are the sign it's working. If the plant keeps getting worse, or the base of the stem softens, take it out and check the roots again.
What not to bother with
Fungicides aren't a practical fix for a houseplant. Few are sold for home use, and the ones that are tend to be expensive. Hydrogen peroxide and cinnamon are recommended all over the internet, but there's no good evidence that either cures root rot in a pot, and nothing revives a root that's already dead. Stick to cutting out the rot and fixing the drainage.
Don't move the plant into a bigger pot "to give it room" either, and don't feed it to perk it up. Both make things worse.
The quick checklist
- Wilting on damp soil → tip the plant out and look at the roots.
- Soft, brown, smelly roots, or an outer layer that slides off → root rot.
- Rinse, cut back to firm tissue, and throw out the old mix.
- Press the stem base. Firm → repot. Soft → cuttings or division from healthy growth, or let it go.
- Repot into fresh mix in a pot only just big enough for what's left.
- Water once or wait a few days. Wait a week to ten days for succulents.
- Bright, indirect light, no fertilizer, and water only when the top inch or two is dry (the whole pot for succulents).
- Hardly any root left → take cuttings from healthy stems, or let it go.
Common questions
Can I just let the soil dry out instead of repotting?
Sometimes, in a mild case caught early. Holding off on water and making sure the pot drains can be enough if only a few roots have gone. The trouble is you can't tell how far the rot has spread without looking, and wet mix in an oversized pot can take weeks to dry, while the rot keeps going. If the plant is wilting on wet soil, take it out and check.
Can root rot spread to my other plants?
It can. The water molds and fungi behind it live in soil and plant debris, and some survive there for a long time, so they travel in reused potting mix, unwashed pots, drainage water and dirty scissors. They mostly attack plants that are already stressed and sitting wet, so a healthy plant in a pot that drains is at low risk. Don't reuse the old mix or the water that drained out, and clean your tools and the pot before using them on anything else.
How long does a plant take to recover from root rot?
Expect it to take weeks. The plant has to grow new roots before it can support new leaves, so expect it to look flat or drop a few more leaves for a while after the rescue. The sign that it's working is fresh growth: a new leaf, or new shoots from the base. On a slow grower like a ZZ plant or a snake plant, that can take a couple of months.
Does root rot always smell?
Often, but not always. Rotted roots can give off a sour or rotten smell, and if you notice it when you tip the plant out, that's a strong hint. No smell doesn't rule rot out, though. Go by how the roots feel: soft, brown roots are rotten whatever they smell like.
Related articles
How often should you water aloe vera and other succulents?
There's no fixed number of days. Succulents want a full soak followed by a full dry-out, and the gap between them shifts with season, light, and pot size.
Overwatered or underwatered? How to tell the difference
Both look like a drooping, yellowing plant — but the fixes are opposites. Four checks that tell you which problem you actually have.
Why are my pothos leaves curling?
Pothos leaves usually curl because the pot has gone too dry, and they flatten out again within a day or two of a good soak. If the soil is already damp, look at the roots, the sun, and the undersides of the leaves instead.
This article was researched and written with AI assistance and reviewed by a human editor before publishing. How we use AI