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TL;DR

• If the pot is very light, soil is bone dry, and the leaves feel thin/limp: treat it as underwatering first (deep water, then reassess in 24–48 hours).
• If curling started after you moved the plant to the vicinity of a window, A/C, heater, or draft: there’s a temperature issue (stabilize temps; keep ’em from regular cold/hot blasts).
• If you water, but it runs straight through, the plant dries out promptly after watering, or if roots are coming out of the drainage hole: it’s probably a case of root binding (repot one size up).
• Here’s a strange one—if you see inward curling in addition to new yellowing, stems mushy, and/or a smelly soil: no, this isn’t a classic case of underwatering—pull it and check for root rot.

What inward-curling pothos (Epipremnum aureum) leaves tell youWhen a pothos leaf is curled inward, you almost always have a water-delivery issue on your hands. Either the plant is losing water too fast (heat or drafts, very dry soil), not getting enough water (true underwatering or hydrophobic), or it’s unable to absorb water efficiently due to a case of root binding—or sometimes root damage. Fortunately, pothos tend to bounce back quickly once the real issue is corrected.

A kick in the pants diagnosis (no fuzzy guessing)

Before you change 3 things at the same time, do this splash diagnosis. Then, if you know you’re right, get out! You’ll have a much cleaner answer on whether the curling is from temperature stress, underwatering, or root binding.

1. Check the plant’s microclimate: Put your hand where the leaves are. Do you feel heater blast, A/C stream, cold draft? If yes, move the plant 3–6 feet away and re-check over the next 24 hours.
2. Lift the pot: If it feels uncharacteristically light for its size, suspect underwatering or a rootbound root ball that’s drying out too fast.
3. Do a fast soil probe: Push a wooden skewer/chopstick to near the bottom of the pot. If it comes out mostly clean and dry, you’re dealing with a dry root zone (underwatering, hydrophobic mix, or root binding).
4. Water test (this is the most revealing step): Slowly water until you get drainage. If water rushes out right away, and the pot still feels light, the root ball is likely hydrophobic and/or root bound. If water soaks in slowly and the pot feels satisfyingly heavy, it was likely true underwatering.
5. Look for rootbound tells without fully repotting: Check drainage holes…if roots are poking out, or if the plant is “lifting” itself up, root binding moves to the top of the list.

Symptom comparison: temperature stress vs underwatering vs root binding

Cause #1: Temperature stress (too cold, too hot, or too drafty)

Pothos is adaptable, but it dislikes fast temperature swings and direct blasts of hot/cold air. Even if your thermostat isn’t alarming “fine,” a pothos sitting right in the path of a vent, or pressed against a window glass at night can be exposed to a very different temperature than the rest of the room.

How to confirm temperature stress (easy checks)

• Curling exacerbated during certain times (overnight cold window, daytime heater cycle).
• Sides of the leaves facing the window / vent look worse.
• Soil moisture seems “okay,” but leaves have already curled or look a bit dehydrated.
• A thermometer tucked near the foliage reads significantly different than a main room reader (and/or the room itself feels quite different).

Fix: stabilize the plant’s microclimate, away from extreme temperatures

1. Move it away from being blasted by direct airflow: 3–6ft away from heater vents and radiators, A/C vents, exterior doors is a good starting proximity.
2. Prevent touching a cold window, especially overnight; push leaves that may touch at night into the warmer (deeper) part, and if necessary, that move deep into the room means pulling it away from the window, and perhaps add a small grow light to fill in for lost window light.
3. Consider gentle warmth; keep it in that area while avoiding very dramatic day / night temperature swings.
4. In its new location, observe for 48 hours before changing anything about watering again, except in very dry-pot scenarios. You’re looking to see what the temperature fix does.

Cause #2: Underwatering (or soil that won’t re-wet)

True underwatering is the easiest thing to blame anxiety on for inward curl: The plant has lost turgor pressure, and that leaf will pewter, or roll inward to expose less surface to the atmosphere in order to conserve water. In the home, this commonly occurs after the seasonal weather has changed (winter heating, summer A/C), or if the plant has moved into a brighter spot, or even after just over-dry spell in the pot.

How to tell it’s underwatering (not just that it’s “dry on top”)

• The leaves curl inward and feel thinner and/or not so firm to the touch.
• Dry 2-3″ down and/or dry nearly to the bottom with a skewer poke through (picture).
• A lot lighter than the pot “usually weighs” on lifting.
• Leaf tips/edges may have a crispy texture if “the drought had been very long”.

Fix: Root ball hydration (getting it right REALLY matters here)

1. “Water” the plant very thoroughly: Add water until you can see a little water sheaf start to drain out the pot holes, and stop watering there too. Let that potty drip right out!
2. If you notice water running down the sides of the pot, or it seems to drain water “too quickly” for comfort?,” place the pot in a bowl or sink of water for 15-30 minutes and let drain very thoroughly. (This will also help re-wet “hydrophobic” peat mixes that have become dry).
3. Check in an hour: go ahead and lift up the pot again. Feels somewhat heavier, but not much? You know the answer? I thought you would! Repeat, probably for shorter only a 10-15 mins soak this time. Slow down a bit: From then on, water when the top 1–2 inches feel dry (your timing may vary according to light, temperature, and pot size—let the soil tell you, not the calendar).

Cause #3. Root bound pothos, aka “my pothos is always thirsty”

A pothos can become so rootbound it curls inward exactly like an underwatered pothos—because it effectively can’t hold or absorb enough water. With roots filling the pot, there’s less room for soil to store moisture, and there may not be enough time for water to soak into the centers of the root mass as it rushes through channels.

Symptoms your pothos is root bound

• Roots emerging from the drainage holes (or tightly circling if you slide the plant out).
• Water drains really fast, and the plant still acts thirsty soon after.
• It dries out much faster than it used to, even in the same spot.
• Growth slows down, and curling/wilting occurs more often between waterings.

The fix:

Repot one size larger (and avoid overstating)

1. Pick the right size pot: Go just 1 pot size larger (typically 1–2 inches wider in diameter). Oversized pots stay damp longer and can lead to root rot.
2. Slide out and assess: Gently pull out the plant. Roots circling tightly at the pot’s edge shows signs of root bound plant.
3. Loosen the root mass: Pull apart exterior roots with your fingers. If the root ball is really heavy, try lightly slicing a few vertical sections to get it spreading outward (don’t go overboard).
4. Refresh the mix: Use a well-draining potting mix. For many pothos, extra perlite/orchid bark helps with aeration.
5. Water in and drain: Water thoroughly once, then stop when it’s fully drained. Don’t let it sit in a cup full of water.
6. Post repotting recovery: Set it in stable light and temperature for a week or two. Wait before fertilizing while it settles in (that new soil is often nutrient rich).

If it’s not one of the “big three”, check these fast

This article covers temperature stress, underwatering and root binding, but pothos leaves can also curl from other things. Make these quick assessments so you don’t end up treating the wrong thing.

• Overwatering / root rot: Curling plus yellowing, mushy stem, fungus gnats, sour smell, or too-wet soil. (This can also appear like “thirst” too because the roots are damaged and can’t absorb water.)
• Too much direct sun: Curling, plus pale patches, burning, or crispy marks on the side facing the window. Common signals of trouble
• Pests! Undersides of the leaves and nodes: check for fine webbing (spider mites), fuzzy white cottony clusters (mealybugs), or a sticky residue. All indicate distress.
• Pair of very low humidity and heat: especially near to vents. The leaves will brown and curl at the tips faster than you think they will.

Rescue plan (48 hours)

1. Out of drafts and direct vent airflow (temperature stress is the easiest and fastest to solve).
2. Skewer test deep into the pot. If the skewer is dry: deep-water, let it drain out the bottom.
3. If the water runs through the pot too fast or the plant dries out again quickly: plan to repot within the next week or two (possibly sooner if the plant is very root packed).
4. Do not worry about fertilizing while the plant is stressed. Work on delivering a stable light, temperature, and moisture content – then come back and fertilize.
5. Look to new growth: The new signs of a true fix will be new leaves that are flat, firm and evenly colored within 2-3 weeks.

Prevention checklist (so it doesn’t happen again)

• Find a nook for your pothos that is in a stable temperature zone. There are no pothos strong enough to handle exposure right at the cusp of a window or vent microclimate.
• Use a pot with drainage holes and that’s free-draining and water accordingly (empty the ‘sauce’ and don’t let it stand).
• Use soil dryness as your guide (top 1-2 inches of pot), rather than by a fixed schedule.
• If your mix has become too hard to re-wet easily, do a bottom-soak from time to time—or refresh that soil in the next repot.
• Repot only if you notice the plant has become rootbound with growing roots filling the pot such that watering becomes difficult and continues to dry out. Alternatively, if the plant’s growth has completely stalled.

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