Why is my plant wilting when the soil is wet?
Root rot is one possible cause. The roots are too damaged to carry water to the leaves, so the plant wilts even in wet soil.
If healthy roots are left, cut out the rotten ones, repot in fresh mix and water only when the soil has dried.
The rescue
If the roots are dark and soft, University of Maryland Extension says to remove the plant from its pot. Cut out the rotten parts and replant the healthy sections.
Healthy roots are light and firm, and rotten roots are dark and soft.
Do it in this order:
- Cut away every dark, soft root and leave the light, firm ones.
- Pick a clean or new pot with drainage holes.
- Fill it with fresh, well-drained potting mix labeled for houseplants.
- Water only after the soil has dried out, and then restart slowly.
Pot size matters here. Do not move the plant into a bigger pot than it needs. A pot that is too large holds extra soil, and that soil keeps water around the roots.
Skip garden soil. Mixes containing soil often drain poorly and may carry root rot organisms, Wisconsin’s Division of Extension warns.
For the watering restart, withhold water until the soil is quite dry and then begin a new schedule gradually. In winter, aim for soil like a freshly wrung-out dish towel: not bone dry, but not too moist.
When it is too late
Discard severely damaged plants.
If the plant is gone but the stems are healthy, take cuttings from healthy tissue and root them in sterile potting mix.
Do not put the old plant back beside healthy ones. Remove and separate infected plants from healthy plants.
What you can see above the soil
Signs of root rot:
- Yellowing, browning and dieback of the leaves
- Poor growth
- Wilting even though the soil is wet
- Browning or blackening at the crown (the base of the plant, where the stems meet the roots)
Some root rots also turn the lower part of the stem black, brown or mushy.
The same wilt can come from too little water, so the leaves alone cannot tell you which. The roots are the place to look.
Overwatering is usually the number one reason indoor plants die in winter. Root rot organisms thrive in wet soil with poor drainage and air, so do not let a plant stand in water.
How to check the roots
Slide the plant out of its pot. Illinois Extension suggests this as a good way to sort out watering problems.
Healthy roots and rotten roots look different:
| What you check | Healthy roots | Rotten roots |
|---|---|---|
| Color | Light-colored, usually white | Dark brown to black |
| Feel | Firm | Soft or mushy |
In pythium root rot (one of the organisms behind root rot), the outer part of a root pulls away from the core and leaves a thin thread.
Often most of the root system stays behind in the pot when the plant is pulled up.
Rusty orange to light brown roots point the other way. That color means too little water, and dark brown to black means too much.
Three habits that stop it coming back
Proper watering comes first among the ways to avoid root rot. Three habits help:
- Unless the plant likes evenly moist soil, water only when the soil is dry. Push a finger about one inch below the surface and water only if it feels dry. Soil moisture checks and watering schedules for containers are covered under when container plants need water.
- Use a pot that can drain, and empty the saucer. Water until it seeps out of the holes, then let it drain for 10 to 20 minutes and remove the excess.
- Start clean. Use fresh potting mix and clean pots, and inspect newly bought plants before placing them with your others. Keep a new plant apart from the rest for one to two weeks.
A layer of gravel at the bottom does not stand in for real holes. The reason is that gravel in the bottom of a pot does not improve drainage and can make waterlogging worse.
The two weeks that follow
For an overwatered plant, the timeline runs in two-week steps. The plant dries out and the watering restarts slowly.
Fertilizer comes after two weeks, not before. Then apply a water-soluble fertilizer made for houseplants.
If there is still no improvement in the two weeks after that, repot in fresh soil.
