Most likely cause

Underwatering is the top cause of curling Pothos leaves. Pothos store little water in their thin, glossy leaves, so when the soil dries out the leaves curl inward to shrink their surface area and slow moisture loss. This is a protective reflex, not permanent damage.

You can confirm it by feeling the soil. If the top two inches are dry, the pot feels light, and the leaves are soft and cupped rather than crispy, thirst is the driver. Water thoroughly until it drains from the bottom, and the leaves usually uncurl within a day or two. If they stay curled after a good soak, look to heat or root problems instead.

Other causes

These rank below underwatering but often overlap with it.

  • Heat stress or a hot draft. Sitting near a heat vent, radiator, or sunny windowsill dries the plant fast; the soil dries quickly and curling worsens in the afternoon.
  • Too much direct sun. Harsh light scorches the foliage; look for curled leaves with pale or brown scorched patches on the sun-facing side.
  • Low humidity. Very dry winter air pulls moisture from the leaves; edges may crisp alongside the curl, and a hygrometer reads below 40 percent.
  • Root damage or pot-bound roots. Damaged or tightly coiled roots cannot supply water; roots circle the pot or poke from drainage holes and curling persists despite watering.

How to fix it

  1. Check the soil. Feel the top two inches. If it is dry and the pot feels light, the plant needs water.
  2. Water thoroughly. Soak until water runs from the drainage holes, then empty the saucer so roots never sit in water.
  3. Move it off heat. Relocate the plant away from vents, radiators, and hot, sunny windowsills.
  4. Adjust the light. Give it bright indirect light, out of direct afternoon sun.
  5. Raise humidity if dry. Use a pebble tray or humidifier to keep humidity in the 40 to 60 percent range.
  6. Check the roots. If curling continues after watering, unpot and inspect for soft brown roots or a tightly bound rootball, trim or repot as needed.
CauseTell-tale signFix
UnderwateringDry soil, light pot, soft cupped leavesWater thoroughly until it drains
Heat or hot draftWorse near vents, dries fastMove away from heat sources
Direct sunScorched patches on sunny sideMove to bright indirect light
Low humidityCrispy edges, below 40 percentAdd pebble tray or humidifier
Root damageCurls despite wet soil, bound rootsTrim roots, repot in fresh mix