Disease problem

How to Identify and Fix Root Rot

Root rot is caused by overwatering and poor drainage, which suffocate the roots and let fungus take hold. Caught early, most plants can be saved by trimming rot and repotting dry.

Root rot is one of the most serious — and most common — houseplant problems, and it's almost always a watering problem in disguise. When soil stays waterlogged, roots can't get oxygen, begin to die, and opportunistic fungi move in and spread the decay.

Above the soil you'll see vague decline: yellowing, wilting despite wet soil, and mushy stems. The only way to confirm it is to look at the roots, and the only way to fix it is to act quickly.

Signs to look for

  • Wilting or drooping even though the soil is wet
  • Yellowing leaves and a general failure to thrive
  • Soft, brown or black roots that smell musty or sour
  • Mushy stem base and soil that stays soggy for days

What causes it

Overwatering

Watering too often, before the soil has dried, keeps roots starved of oxygen and is the root cause in most cases.

Poor drainage

Pots without drainage holes, or dense soil that holds too much water, trap moisture around the roots.

Oversized pots

A pot much larger than the root ball holds a reservoir of wet soil the roots can't use, staying soggy long after watering.

Cold, wet conditions

Low temperatures slow water uptake and evaporation, compounding waterlogging in winter.

How to fix it

  1. 1
    Unpot and inspect the roots

    Gently remove the plant and shake off the soil. Healthy roots are firm and white or tan; rotted roots are brown or black, slimy and fall apart when touched.

  2. 2
    Trim away all rot

    Using clean, sharp scissors sterilized with alcohol, cut off every mushy, discolored root back to healthy tissue. Don't be timid — leaving rot behind lets it spread.

  3. 3
    Remove affected leaves

    Trim proportionally — if you removed a lot of roots, remove some of the top growth too so the reduced root system isn't overwhelmed.

  4. 4
    Repot in fresh, dry mix

    Discard the old soggy soil. Repot into a clean pot with drainage holes using fresh, well-draining mix appropriate for the plant.

  5. 5
    Water sparingly while it recovers

    Water lightly and only when the top of the soil dries. Keep the plant warm and in bright indirect light, and avoid fertilizing until you see new growth.

How to prevent it

  • Always let the soil dry to the recommended depth before watering
  • Use pots with drainage holes and a well-draining mix
  • Pot up only one size at a time — avoid oversized pots
  • Empty saucers and cache pots so the plant never sits in water

Plants prone to this

Snake PlantMonstera DeliciosaZZ Plant

Related problems

Signs of Overwatering and How to Fix ItOverwatering suffocates roots in soggy soil, causing yellowing, soft leaves, and eventually root rot. The fix is to let the soil dry, improve drainage, and water by feel instead of a schedule.Why Are My Plant's Leaves Turning Yellow?Yellowing leaves (chlorosis) are most often caused by overwatering, but light, nutrients and natural aging can all play a role. Here's how to find the real cause and fix it.Why Are My Plant's Leaves Drooping?Drooping leaves usually point to a watering issue: either too dry or too wet. Check the soil first, since over and underwatering cause the same sad, sagging look from opposite causes.

FAQ

Can a plant recover from root rot?

Often yes, if you catch it before the rot consumes the entire root system. Trim away all the mushy brown roots, repot in fresh well-draining soil, and water sparingly. If the stem base is mushy and almost no healthy roots remain, the plant may not recover — but you can sometimes salvage healthy cuttings to propagate.

What does root rot smell like?

Rotting roots have a distinctive musty, sour or swampy smell, quite different from the earthy smell of healthy soil. If you notice that odor along with soggy soil and wilting, root rot is very likely.

Should I use cinnamon or fungicide on root rot?

Cinnamon has mild antifungal properties and can be dusted on cut roots as a gentle measure, but the essential fix is removing the rotted tissue and correcting drainage and watering. A houseplant fungicide can help in severe cases, but it won't work if the soil stays waterlogged.