Pothos Root Rot: How to Confirm It and What to Cut

Root rot is the most serious watering problem a pothos can have, but it is often caught early enough to fix. It starts in mix that stays wet. Virginia Cooperative Extension explains that water then fills the pore spaces, oxygen runs short, and roots stop growing and die. Water molds such as Pythium and Phytophthora move into the weakened roots.

The leaves only show the damage later. Confirm it at the roots before you cut anything.

Signs That Point to Root Rot

University of Maryland Extension lists yellowing, browning and dieback of leaves, darkened roots and crown, and poor growth. The key clue is wilting while the mix is still wet. Damaged roots can no longer move water to the leaves.

Other signs to check:

• The pot stays heavy days after watering.
• The mix smells sour or rotten.
• Stems near the soil line are soft or dark.
• Fungus gnats hover over the pot.

Virginia Tech lists rotten-smelling soil, soft stems and fungus gnats among the symptoms of overwatering. See our fungus gnat guide if they are present.

Confirm It at the Roots

Slide the plant out of its pot and loosen the mix. Healthy roots feel firm. UMD describes rotted roots this way:

• Pythium: roots are brown to black and soft. The outer layer pulls off and leaves a thin, hair-like core. Much of the root system may stay behind in the pot.
• Phytophthora: root tips turn dark brown and quickly go mushy. Lower stems can blacken, and lower leaves yellow and drop.
• Rhizoctonia: coarse, reddish-brown threads like a spider web on roots and stems.

UF/IFAS names Phytophthora root rot as the most common disease of pothos in commercial production. It can turn whole leaves dark brown to black, but the leaf and stem veins do not blacken (UF/IFAS PP340).

Rule Out the Look-Alikes

• Dry mix and a light pot. Virginia Tech notes that underwatered plants also wilt. Dry mix that has shrunk from the pot wall points to thirst. See our drooping pothos guide.
• Black veins with wilting. UF/IFAS links this pattern to bacterial wilt, not root rot. See our pothos black stems guide and bacterial infection guide.
• A single wet spell. A soaked pot with firm roots and no odor needs drying, not surgery. Our overwatered pothos guide covers that triage.

What to Do

1. Stop watering. Lift the plant out of any decorative pot and empty the saucer.
2. Clear the roots. Gently remove the old mix so you can see every root.
3. Cut the rot. Use clean, sharp scissors. Remove dead, brown roots, as UMD’s repotting guide advises. Keep every root that is still firm.
4. Use a clean pot. UMD advises clean or new pots and a sterile potting mix, not garden soil. The pot needs a drainage hole.
5. Match the pot to the roots. Virginia Tech warns that a pot that is too large leaves roots in a zone that stays too wet. A reduced root system needs a smaller pot.
6. Water once. UMD’s repotting steps say to water thoroughly, then wait until the top of the mix dries.
7. Hold the fertilizer. UMD links excess fertilizer salts to dead root tips. Feed only after new growth appears.

When the Roots Are Mostly Gone

UMD advises throwing away severely infected plants and taking stem cuttings only from healthy tissue. Cut above the damaged section into firm stem. Each cutting needs a node to root. Our node selection guide shows where to cut.

Root the cuttings in fresh water or new mix in a clean container. Do not reuse the old mix.

Keep It From Coming Back

• Water by the mix, not the calendar. UMD notes that many people assume once a week is right, and that winter overwatering is a common cause of root rot. NC State advises letting the well-drained mix dry out between waterings (NC State).
• Check depth, not just the surface. UMD suggests lifting the pot to judge its weight, or pushing a dowel to the bottom. Moist soil sticks to the dowel.
• Drain fully. Virginia Tech says not to leave a pot standing in water for more than 60 minutes.
• Slow down in autumn and winter. Virginia Tech notes that growth slows and the mix stays wet longer.

Old yellow leaves will not turn green again. Judge recovery by firm stems and healthy new leaves.

References

• University of Maryland Extension: Root Rots of Indoor Plants
• University of Maryland Extension: Winter Indoor Plant Problems
• University of Maryland Extension: Potting and Repotting Indoor Plants
• Virginia Cooperative Extension SPES-804: Properly Watering Container Houseplants
• UF/IFAS Extension PP340: Pothos (Epipremnum aureum) Diseases
• NC State Extension Gardener Plant Toolbox: Epipremnum aureum