Monstera care: light, water and bigger split leaves

Light

Fenestration works like a light meter you can read at a glance. Clemson Extension warns that a monstera grown in too little light will not develop its perforations, and the RHS adds that plants kept in very low light carry fewer holes. NC State asks for moderate brightness without direct sun, and the RHS suggests an east- or west-facing window, or a bright room a little back from the glass. In University of Illinois Extension terms that is medium to high light, roughly 150 to 300 foot-candles: directly in front of an east or west window, or within about 5 feet of a south one.

Hot afternoon sun through glass is the upper limit. The RHS notes that direct sun scorches the leaves, leaving pale, papery patches that never green up again. Variegated forms such as 'Thai Constellation' carry less chlorophyll, and NC State says they need more light than plain green plants, so give them the brightest filtered spot you have. Turn the pot now and then, because new leaves unfurl toward the window and a lopsided plant is harder to stake.

Water

NC State gives an unusually precise rule for this plant: soak the pot, then let the top quarter to one-third of the mix dry before watering again. In a deep floor pot that means several inches of dry mix, not just a dry crust, so push a finger or a wooden skewer well down before you decide. The RHS phrases it as letting the compost become almost dry before a thorough watering, and never leaving the pot sitting in a saucer.

Those broad leaves move a lot of water in summer, and a monstera on a bright, warm sill can dry out faster than you expect. Winter reverses the picture: growth slows, the mix stays damp longer, and the RHS advises watering slightly less often. Check the mix each time rather than keeping a calendar.

Water quality matters too. The RHS recommends rainwater or filtered water at room temperature where tap water is hard and alkaline, because the plant prefers a slightly acidic root zone. If you grow it on a moss pole, wet the moss when you water; the RHS notes the aerial roots will grow into it when it stays moist, which anchors the stems far better than ties alone.

Soil and pH

The RHS recommends an open, well-drained, slightly acidic mix of about pH 5 to 6, made from two parts orchid compost to one part peat-free ericaceous compost. That chunky, bark-heavy blend copies the tree bark the plant clings to in the wild and lets air reach roots that rot quickly in dense, waterlogged soil. NC State lists the plant for soils high in organic matter with good drainage but in a neutral pH range, so the two sources disagree on acidity; a quality houseplant mix opened up with orchid bark and perlite sits comfortably between them. Pick a heavy pot: the RHS points out that big monsteras become top-heavy and topple light plastic containers.

Humidity

Monstera grows in forest understory where the air stays humid, and NC State lists high humidity as its preference. The RHS is a little more relaxed, asking for moderate humidity, but warns that leaf edges brown when central heating dries the air. A humidifier or a tray of wet pebbles under the pot, both suggested by NC State, does more than occasional misting, and grouping several tropical plants together raises the moisture around all of them.

Temperature

Keep a monstera warm all year. The RHS gives 65 to 77°F (18 to 25°C) as the target, and NC State a broader average of 60 to 85°F, so treat 60°F as the floor. Cold drafts from an opened door or a single-pane window in January are the usual threat, and the RHS also warns against parking the plant beside a radiator or heating vent, where hot, dry air crisps the foliage.

Fertilizer

Feed only during active growth. The RHS recommends a balanced liquid fertilizer from April to September, and the University of Illinois Extension advises feeding most houseplants no more than once every one to three months between March and September, using a balanced 10-10-10 or a 1:2:1 ratio such as 10-20-10 at the label rate. A fast-growing monstera in bright light can take the monthly end of that range; one in a dimmer room needs far less, because a plant that is barely growing cannot use the salts. Illinois also suggests leaching the pot with a large volume of plain water every 4 to 6 months to rinse out salt buildup.

Work out the dose for your watering can with the fertilizer dilution calculator →

Repotting

A young monstera can usually stay in its nursery pot for a year or two, according to the RHS, after which this vigorous climber wants a new container every few years. The signs are roots circling the base or escaping the drainage holes, thick aerial roots lifting the plant out of its pot, and a root ball that dries within days of a soaking. Repot in spring, the season NC State names for pruning and repotting.

Go up only 1 or 2 inches in diameter, the Clemson Extension rule for houseplants; the RHS likewise warns that an oversized pot keeps the compost wet too long. Set the moss pole at the same time, pushing it to the bottom of the new pot before the root ball goes in, so you never have to spear through roots later. Tie stems to it loosely with soft ties; NC State notes that sturdy support keeps the heavy stems from breaking.

• Roots circle the bottom of the pot or escape the drainage holes
• Thick aerial roots push the root ball up out of the container
• The mix dries out within days of a thorough watering
• The top-heavy plant tips its pot over

Propagation

Monstera roots from stem cuttings, and NC State also lists layering. What matters is the node, the swollen ring on the stem where a leaf stalk and usually an aerial root emerge. Cut just below a node that carries an aerial root, keep one leaf, and stand the cutting in water in a bright spot, as the RHS suggests, until it has a good set of roots, then pot it in the same airy mix. A leaf snipped off with only its stalk has no bud to grow from, however long it sits in a vase.

Air layering suits a tall, leggy plant whose top you want to keep. The University of Illinois Extension describes the method: a shallow upward cut into the stem, a fist-sized ball of very moist sphagnum peat moss around it, clear plastic tied over the moss, and roots showing through after 3 to 4 months. Choosing a spot just below an aerial root gives the new roots a head start. Once they show, cut beneath the moss ball and pot the rooted top.

Methods: Stem cuttings that include a node and an aerial root, Air layering · Best season: spring to late summer.

Common problems

Most monstera trouble comes down to light or water. Small leaves without holes on long, bare stems mean the plant is reaching for light, which Clemson and the RHS both connect to missing fenestrations. Yellowing lower leaves in a pot that never dries point to roots sitting wet, and the RHS lists overwatering and poorly draining compost as the causes of root rot and collapse. Brown, crisp margins follow dry indoor air, and scorched pale patches follow direct sun. Sticky residue usually means mealybugs, the pest the RHS names. Beyond these, NC State reports no significant problems, which makes the plant forgiving once its basics are in place.

Not sure which one it is? Try the plant problem diagnosis tool →

Is the monstera toxic to cats and dogs?

The ASPCA lists the Swiss cheese plant (Monstera deliciosa) as toxic to both cats and dogs. Its tissues hold insoluble calcium oxalate crystals, and a pet that bites a leaf typically shows oral irritation, intense burning and irritation of the mouth, tongue and lips, excessive drooling, vomiting and difficulty swallowing. NC State rates the poison severity for people as low, noting that the sap can irritate skin. Keep the plant away from pets that chew, wear gloves when pruning as the RHS advises, and call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 if a pet eats any of it.

Check any other plant against the ASPCA lists →