Curling monstera leaves are the plant’s way of conserving moisture. When a monstera curls its leaves inward — rolling up like a taco or cupping along the edges — it’s reducing the surface area exposed to air and light to slow water loss. That makes curling almost always a sign of dehydration somewhere in the system, whether the roots aren’t getting enough water, the air is too dry, the room is too hot, or pests are draining the leaves from underneath. The good news: monstera leaves usually uncurl once you fix the cause, especially if you catch it early. This guide covers the four reasons monstera leaves curl, how to tell them apart, and how to flatten them out again.
Key Takeaways
- Curling is a moisture-conservation response — the plant is telling you it’s losing water faster than it can replace it.
- Underwatering is the most common cause; check whether the soil has gone bone dry between waterings.
- Low humidity, especially in winter with the heat running, makes leaf edges curl and crisp.
- Heat stress and direct sun near a hot window cause cupping and curling on the most exposed leaves.
- Check leaf undersides for spider mites and thrips, which cause curling alongside stippling and webbing.
Cause 1: Underwatering and dry roots
The most common reason monstera leaves curl is simply that the plant is thirsty. When the soil dries out completely and stays dry, the roots can’t supply enough water to the leaves, so the plant curls them up to cut its losses. Monsteras are fairly drought-tolerant for a few days, but let the soil go bone dry for too long and the leaves respond fast — curling inward, sometimes drooping, with edges that may start to crisp and brown.
How to diagnose it
Push a finger 2 to 3 inches into the soil. If it’s dry that far down, and the pot feels light when you lift it, underwatering is your answer. Drought-curled leaves are usually accompanied by limp, drooping stems and dry, papery edges. The soil may have pulled away from the sides of the pot, which means water runs straight down the gap and out the bottom without soaking the root ball.
How to fix it
Give the plant a thorough drink. If the soil has shrunk from the pot, bottom-water it — set the pot in a basin of water for 20 to 30 minutes so the root ball rehydrates fully — then let it drain. The leaves should begin to uncurl within a day or two. Going forward, water when the top 2 inches of soil are dry, soaking until water runs from the drainage holes, then empty the saucer. For most homes that’s about every 7 to 10 days in summer. Don’t swing to the opposite extreme and keep the soil soggy — that causes root rot, which produces its own curling and drooping. Aim for evenly moist, never wet and never bone dry.
Cause 2: Low humidity
Monsteras come from humid tropical forests where the air sits around 60 to 80% humidity. The dry air of a heated or air-conditioned home — often 30% or lower in winter — pulls moisture out of the leaves faster than the roots can replace it, and the leaf edges curl and crisp in response. This is especially common in winter when central heating runs, and near radiators or forced-air vents.
How to diagnose it
Low-humidity curling typically starts at the leaf edges and tips, which curl and turn crispy brown while the soil moisture is fine. If the curling got worse when you turned the heat on, or the plant sits near a vent, fireplace, or radiator, dry air is the likely cause. A cheap hygrometer confirms it — readings below 40% are too dry for a happy monstera.
How to fix it
Raise the humidity around the plant. The most effective option is a small room humidifier running near the plant to keep it above 50%. Grouping plants together creates a moister microclimate, as does setting the pot on a pebble tray filled with water (keep the pot above the waterline, not in it). Move the monstera away from heat sources and drafty vents. Misting helps only briefly and can encourage fungal spots, so a humidifier is the better long-term fix. The same dry-air issue plagues many tropicals — our notes on indoor humidity for houseplants apply across your whole collection.
Cause 3: Heat stress and too much direct sun
Excess heat amplifies water loss. A monstera parked in hot, direct sun — especially behind a south or west window in summer — transpires faster than its roots can keep up, so it curls and cups its leaves to protect itself. Sustained temperatures above the mid-80s°F, or the localized heat of direct sun on the foliage, both trigger this protective curling. Hot, dry air near appliances or vents compounds the effect.
How to diagnose it
Heat-stressed leaves curl and cup on the side facing the light or heat source, and may show pale, bleached, or scorched patches where direct sun hits. If the curling is worst on the sunniest leaves, intensifies in the afternoon, or coincides with a heat wave, temperature is the driver. Check whether the plant gets blasted by direct sun at any point in the day.
How to fix it
Move the plant out of direct sun into bright, indirect light, or filter the window with a sheer curtain. Keep room temperatures in the monstera’s comfort zone of 65 to 85°F and away from heat sources. In a heat wave, water a touch more frequently and boost humidity to help the plant cope. Once it’s out of the hot spot and properly hydrated, the cupping should relax over the following days. Avoid moving it straight from deep shade into bright light, which causes shock — make the transition gradual over a week or two.
Cause 4: Pests draining the leaves
Sap-sucking pests — spider mites and thrips in particular — pierce monstera leaves and drain their fluids, which causes the leaves to curl, distort, and lose vigor. Pests are easy to miss because they hide on the undersides of leaves and in new growth, so curling without an obvious watering or heat cause should always prompt a close inspection.
How to diagnose it
Turn leaves over and look closely, ideally with a magnifier. Spider mites leave fine webbing in the leaf joints and a stippled, speckled look on the foliage; you may see tiny moving dots. Thrips cause silvery streaking, black specks of frass, and twisted, curled new growth. Both worsen in warm, dry conditions, which is why pest curling and humidity curling sometimes happen together.
How to fix it
Isolate the plant immediately so the pests don’t spread to your other houseplants. Rinse the foliage in the shower or sink to knock off as many pests as possible, then treat thoroughly — including leaf undersides and stems — with insecticidal soap or neem oil. Repeat every 5 to 7 days for at least three rounds to catch newly hatched pests, since a single treatment misses the eggs. Wipe down nearby surfaces and keep humidity up, since spider mites thrive in dry air. New growth that emerges after treatment should come in flat and undamaged.
How to prevent monstera leaves from curling
Because curling is a dehydration signal, prevention is about keeping the plant’s water supply steady from roots to air. Water when the top 2 inches of soil are dry — never let it go bone dry, never leave it soggy. Keep humidity above 50% with a humidifier, especially in winter. Site the plant in bright, indirect light away from hot windows, vents, and radiators, and hold temperatures between 65 and 85°F. Inspect leaf undersides regularly so you catch spider mites and thrips before they take hold. With consistent moisture, comfortable air, and pest-free leaves, a monstera holds its leaves flat and broad. If your plant is also failing to develop its signature holes, see our companion guide on why monsteras don’t fenestrate, and browse more houseplant care guides for the rest of your collection.
Frequently Asked Questions
Will curled monstera leaves uncurl again?
Often yes, if you fix the cause early. Leaves curled from thirst usually flatten within a day or two of a good watering. Leaves with severe, prolonged damage or crispy brown edges may stay partly curled — those won’t fully recover, but new growth will come in flat once conditions are right.
Is my monstera curling from too much or too little water?
Usually too little — dry, light soil plus drooping, papery-edged leaves means underwatering. But overwatering and root rot can also cause curling, paired with wet soil, soft stems, and a sour smell. Check the soil moisture first to tell which way it’s leaning.
Do monsteras need high humidity to stop curling?
They prefer it. Monsteras come from humid forests and do best above 50% humidity. Dry indoor air, especially in winter, makes leaf edges curl and crisp. A room humidifier is the most reliable fix; pebble trays and grouping plants help a little too.
Can new monstera leaves curl as they grow?
Yes — and that’s normal. New monstera leaves emerge tightly rolled and unfurl over several days. That developmental curl is healthy. Worry only when established leaves that were previously flat start curling, which points to a stress cause.
Why are only the edges of my monstera leaves curling?
Edge curling that turns crispy and brown usually means low humidity or underwatering — the thinnest parts of the leaf dry out first. Raise humidity above 50% and keep the soil evenly moist. If the whole leaf cups instead, look at heat, direct sun, or pests.