Why Are My Pothos Leaves Curling? 6 Causes (and the Fastest Fix for Each)

Pothos is one of the most forgiving houseplants you can own, which is why curling leaves tend to catch growers off guard. The plant is communicating something specific — and the direction and pattern of the curl are the signal. New leaves cupping upward with dry soil point to underwatering. Older leaves curling and yellowing with wet soil? That’s the opposite problem: root rot from overwatering. Fine webbing on leaf undersides means pests. No single fix works for all of them, and applying the wrong one can make things worse.

This guide covers the six most common causes of curling pothos leaves, with a quick visual triage table to identify your specific cause before you start. If your plant is showing other symptoms alongside the curl — yellowing, browning, or overall decline — the complete pothos symptom checker covers the full picture. For general care baselines, the pothos care guide has light, soil, and feeding requirements in one place.

First: What the Curl Pattern Tells You

Before adjusting watering or moving your plant, spend 30 seconds matching your symptoms to the table below. Curl direction and leaf position narrow the list from six causes to one or two — saving you from applying the wrong fix.

Once you’ve matched your symptom, jump straight to that cause below.

Three pre-planned garden beds, free

Stop staring at empty beds: printable plans with exact layouts, plant lists and planting calendars — yours free from the Garden Library.

Send me the plans

I agree to receive emails from Blooming Expert and accept the Privacy Policy. Unsubscribe anytime.

Cause 1: Underwatering — The Turgor Pressure Drop

Underwatering is the most common reason pothos leaves curl, and the mechanism is direct. Every plant cell is inflated like a tiny balloon — the water pressure inside (called turgor pressure) is what keeps leaves flat and firm. When soil dries out, the plant loses water faster than its roots can replace it, and that internal pressure drops. Research published in Cellular and Molecular Life Sciences confirms that leaf rolling is a turgor-driven drought response: a rolled leaf presents less surface area to the air, cutting the rate of further water loss.

Penn State Extension describes pothos as a plant that is “better kept too dry than too wet,” but there is absolutely a too-dry threshold. The tell-tale signs: bone-dry soil when you push your finger 2 inches deep, leaves that feel soft and pliable (not crisp), and a slow spring-back when you gently squeeze a curled leaf. Contrast this with low humidity (Cause 3), where the soil feels fine but the air is stripping moisture from leaves faster than roots can compensate.

The fix: Take the pot to a sink and water thoroughly until water drains freely from the bottom. Let it drain for 15 minutes, then return it to its spot. This soak-and-drain approach saturates the root zone rather than just wetting the top inch. Within a few hours, leaves should begin to relax. If they don’t fully uncurl in 24 hours, check for root-bound conditions (Cause 6) — a dense root mass can prevent even a good soak from reaching all roots.

Cause 2: Overwatering and Root Rot — The Wet-Soil Paradox

Overwatering causes leaf curl by the same mechanism as underwatering — the plant can’t move water to its leaves — but for the opposite reason. Waterlogged soil displaces oxygen from soil pores. Without oxygen, roots switch to anaerobic respiration, producing toxic byproducts like ethanol and lactic acid. Opportunistic water molds, primarily Phytophthora, exploit the weakened tissue and rot the roots. Dead roots can’t transport water. Leaves curl and yellow even though the soil is soaking wet.

This is the wet-soil paradox: curling leaves with moist or soggy soil almost always signals overwatering, not underwatering. NC State Extension specifically notes that overwatering causes “root rot and blackening of leaf margins.” UF/IFAS guidelines confirm that pothos performs better indoors “a little on the dry side.” The secondary signs are unmistakable once you check the roots: healthy roots are white or pale tan and firm; roots affected by rot are brown to black, soft, and may smell sour or musty.

The fix: Pull the plant from its pot. Trim all mushy, dark roots with clean scissors — sterilize the blades with rubbing alcohol first. Repot in fresh, well-draining mix (standard potting soil with 20–30% perlite). Wait 7–10 days before watering again, and check soil at the 2-inch level before every subsequent watering. Ensure the pot has drainage holes; without them, overwatering is virtually guaranteed over time.

Cause 3: Low Humidity — When the Air Steals Moisture

Pothos evolved in tropical forest understories where relative humidity runs 60–100% — the UF/IFAS commercial growing guidelines cite this as the optimal production range. Most heated or air-conditioned homes sit at 30–40% RH in winter, sometimes lower. At those levels, the vapor pressure gradient between leaf surfaces and surrounding air is steep, meaning the air is pulling moisture out of leaves faster than roots can resupply it.

Unlike underwatering, low-humidity curl happens with perfectly adequate soil moisture. You’ll notice leaf edges becoming slightly crispy or papery first, then the whole leaf begins to curl inward. This symptom worsens in winter and near heating vents. A basic hygrometer (under $15) confirms whether low humidity is the culprit — if your reading is consistently below 40%, this is the likely cause.

The fix: The most reliable solution is a small humidifier near the plant, maintaining 50–60% RH consistently. A pebble tray filled with water under the pot also helps — as the water evaporates, it raises local humidity immediately around the plant. Grouping houseplants together creates a micro-humid zone as they transpire. Misting is not a reliable fix: it raises humidity for minutes, not hours, and risks fungal issues on leaf surfaces. NC State Extension recommends a humidifier or pebble tray as the preferred approach.

Cause 4: Temperature Stress — Heat and Cold Both Trigger Curling

Pothos grows well between 65–80°F — Penn State Extension’s recommended range for houseplant conditions. UF/IFAS production guidelines show that quality declines when day temperatures exceed 95°F or night temperatures drop below 65°F. Both extremes cause leaf curling, but in distinct ways.

Heat stress: Leaves cup upward. This is an adaptive response that reduces the surface area exposed to solar radiation, limiting further water loss — the same mechanism as drought curl, but triggered by radiant heat rather than dry soil. UF/IFAS also notes that high light or heat causes “burned patches in variegated areas” as a secondary sign. A pothos sitting in a south-facing window in summer, or near a heating vent, is a prime candidate.

Watering mistakes cause more damage than most pests — yellow leaves fix has the details.

Cold stress: Below 60°F, leaves curl inward and may show brown patches where cell membranes have been damaged by chilling. Cold drafts from windows or air-conditioning vents are the most common culprits, especially in winter when a plant sits near a single-pane window.

The fix: Move the plant to a stable 65–80°F location, away from drafty windows, AC vents, and radiators. A small thermometer near the plant for a few days confirms whether temperature swings are occurring. Once in the right spot, new leaves should emerge uncurled within 2–4 weeks.

Cause 5: Spider Mites and Aphids — Tiny Pests, Visible Damage

Two common sap-sucking pests cause pothos leaves to curl: spider mites and aphids. Both feed by puncturing leaf cells and extracting cell contents, disrupting the structure that keeps leaves flat. The result is distortion, curl, and often stippling or discoloration before the grower notices any insects at all.

Spider mites thrive in warm, dry conditions — the same low-humidity environment that already stresses pothos. Look for light-colored stippling (tiny pale dots) on the upper leaf surface, and fine silky webbing on leaf undersides and at stem joints. Clemson University’s HGIC notes that webbing is the telltale sign for heavier infestations; use a magnifying glass to spot mites themselves on leaf undersides. Spider mites are not insects — they’re arachnids — so treatment needs to target them specifically.

Aphids cluster on new growth, causing distortion and excreting sticky honeydew. Sooty mold (a black coating) often follows as a secondary sign that aphids have been active for some time.

The fix: For spider mites, take the plant to a sink and blast leaf undersides with a firm stream of water, then apply insecticidal soap directly to all leaf surfaces. Clemson HGIC recommends repeating weekly for several weeks — one application won’t eliminate all life stages. For aphids, a water blast or rubbing alcohol on a cotton swab removes visible colonies; follow up with insecticidal soap. To prevent recurrence, maintain humidity above 40% — spider mites rarely establish in consistently humid conditions.

Cause 6: Root-Bound — The Most Overlooked Cause

Root-bound pothos is frequently misdiagnosed as underwatering, because the symptoms are nearly identical — leaves curl and wilt even after regular watering. The difference is in the response: an underwatered plant perks up within a few hours of a good soak. A root-bound plant stays wilted, because the dense root mass has displaced most of the potting soil, leaving little medium to hold moisture. Water drains almost instantly and delivers little benefit to the plant.

If you are growing this for the first time, start with why brown tips.

Check for these signs: roots visibly circling out of drainage holes, water that flows through the pot in under a minute, and a rootball that lifts out intact in the shape of the container. NC State Extension recommends repotting pothos every 2–3 years, and UF/IFAS notes that while pothos tolerates some root restriction, leaf quality and growth rate eventually decline. A pot that was fine 2 years ago may now be the limiting factor.

The fix: Repot into a container 1–2 inches larger in diameter — no more. Oversized pots hold excess moisture and increase overwatering risk. Use fresh, well-draining potting mix, and gently tease apart any tightly circling roots before placing the plant in the new pot. Water thoroughly after repotting, then return to your normal watering schedule. New leaves growing uncurled within 2–4 weeks confirms the plant has settled in.

Quick Diagnosis: 7 Symptoms at a Glance

Use this table to confirm your diagnosis before applying any fix.

When to Hold Off on Treatment

Applying the wrong fix consistently makes things worse. A few rules worth knowing:

• Don’t increase watering if the soil is already wet. Curling leaves with moist soil signal overwatering, not drought. More water accelerates root rot. Check the soil at 2 inches before every watering.
• Don’t repot a plant that’s actively recovering from root rot. Repotting adds transplant stress on top of disease stress. Stabilize first: trim affected roots, fresh mix, let dry — then assess pot size separately.
• Don’t apply neem oil or insecticidal soap in direct sun or temperatures above 85°F. The oil base becomes phytotoxic at high temperatures, burning leaves instead of treating pests. Apply in the morning or evening.
• Don’t mist leaves to fix humidity. Misting raises surface humidity for 10–20 minutes and can promote fungal leaf spots. Use a humidifier or pebble tray for sustained results.

Prevention: Stop Curling Before It Starts

Most pothos problems are environmental, which means they’re preventable with consistent conditions:

• Watering rhythm: Use the soak-and-drain method when the top 2 inches of soil are dry. Penn State Extension confirms this suits pothos well. Never water on a fixed day-of-week schedule — check the soil first, every time.
• Humidity and temperature: Aim for 50–60% RH and 65–80°F year-round. A combined thermometer/hygrometer (under $15) removes all guesswork.
• Pest prevention: Wipe leaves with a damp cloth monthly and inspect undersides. Isolate any new plant for two weeks before placing it near your existing collection. Spider mites spread fast between plants in a group.
• Pot sizing: Repot every 2–3 years, or when roots emerge from drainage holes. Go one pot size up at a time to avoid overwatering risk.
• Light: Bright, indirect light — near an east-facing window is ideal. Avoid direct afternoon sun, which triggers both heat curl and burned variegation in lighter-colored cultivars.

Key Takeaways

• The curl pattern — direction, leaf position, and soil condition — is the fastest route to the correct diagnosis.
• Curling with dry soil = underwatering. Curling with wet soil = overwatering. These look similar but need opposite fixes.
• Low humidity and root-bound conditions are the two causes most growers overlook — both mimic underwatering symptoms but don’t respond to watering.
• Spider mites thrive in dry conditions; raising humidity above 40% is both treatment support and prevention.
• Once you’ve corrected the cause, new growth should emerge uncurled within 2–4 weeks. Existing curled leaves may not fully flatten — that’s normal.

Sources

1. Penn State Extension — Pothos as a Houseplant
2. UF/IFAS EDIS — Cultural Guidelines for Commercial Production of Interiorscape Epipremnum (EP151)
3. NC State Extension Plant Toolbox — Epipremnum aureum (Pothos)
4. UF/IFAS EDIS — Pothos Diseases: Identification and Control (PP340)
5. Clemson University HGIC — Common Houseplant Insects and Related Pests
6. University of Maryland Extension — Fertilizer Toxicity or High Soluble Salts in Indoor Plants
7. Fang & Xiong — General mechanisms of drought response and their application in drought resistance improvement in plants (PMC)