Swiss Cheese Vine

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Bright light, with the sun kept off its leaves, is where it grows fastest and fullest. It tolerates a medium-lit room, though growth there likely slows.

Under a rainforest canopy in Mexico and Central and South America, it grows in dappled light (NC State; University of Illinois Extension), and indoors it wants much the same. An east window gives it that; facing south or west, a sheer curtain spares the leaves the scorch NC State warns of.

Its trailing vines tend to drape across the sill and rest against the pane, so in January lift them clear; NC State advises against temperatures below 50°F.

Bright, yes; sunbathing, no.

Roughly every 7-10 days in summer, stretching to 10-14 in winter, with the soil drying a little between; it loves humid air too. Push it toward soggy, though, and NC State warns of root rot.

A rainforest climber at heart, it likes damp air: Penn State suggests humidity above 50%, and NC State suggests setting the pot on a pebble tray kept moist.

Water the soil rather than the leaves. A full curtain of vines holds damp air close, and NC State links splashed foliage and poor air flow to leaf spots. If it climbs a moss pole, wet the moss each time you water too.

In very dry rooms, Penn State notes a humidifier may help. It’ll survive without one.

Gone for a while? Ten days is fine if it’s watered the day you leave.

Vines up to about 8 feet and 1-3 wide indoors. Staked, it makes a slim green column; hung high, a curtain of lace. Its aerial roots grip a damp moss pole as it climbs.

How you grow it changes the leaves. RHS notes that once it feels it’s climbing, it often makes bigger leaves, and Penn State adds that leaves on a support come in greener and larger.

The little brown roots along each stem mark its nodes, and a stem cutting with one of them is NC State’s recommended start for another plant; rooted pieces can go back into the pot to thicken a thin top.

Trained upright, it’s a narrow vertical that fits beside a bookcase or a window frame. Left to trail, it softens the edge of a high shelf or the top of a kitchen cabinet.

Chewing releases calcium-oxalate crystals that can sting the mouth and bring on drooling or vomiting. The ASPCA lists Monstera among low-severity plants for pets, and NC State rates this species low severity.

Every part holds the crystals, from roots to flowers, and the sap alone can redden skin (NC State lists contact dermatitis). Gloves help when you trim it or take cuttings, and it’s worth washing up before touching your eyes.

A swallowed bite may carry the irritation down to the throat and stomach, sometimes with a lost appetite (NC State). Watch at home; it usually passes on its own. If symptoms don’t settle, Poison Control can help with a child, and your vet or the ASPCA Animal Poison Control Center (a fee may apply) with a pet.

Still want one? Its vines make height easy: train it up a pole on a dresser, or let it trail from a hanging pot, which keeps it out of easy reach of a dog or toddler. Cats climb, so if yours is a nibbler, give it a room the cat doesn’t visit.

1. ASPCA: mild for dogs (rates the whole genus).
2. Pet Poison Helpline: mild for dogs (rates the whole genus).
3. ASPCA: mild for cats (rates the whole genus).
4. Pet Poison Helpline: mild for cats (rates the whole genus).
5. NC State Extension: mild for kids.

Cats and dogs: Most of the leading sources agree.

Kids: No poison-centre listing; rated from university extension sources.

Happiest at 65-77°F, and it shouldn’t sit below 50°F. It likes 50-80% humidity and gets by at 40%.

Temperature

65-77°F

Humidity

50-80%

Fern scale is the one to watch for, as small bumps on leaves and stems. Mites and whiteflies sit under leaves, mealybugs in axils, aphids on new growth, thrips on leaves, and gnats in the soil surface.

• Fern scale
• Spider mites
• Mealybugs
• Aphids
• Whiteflies
• Thrips
• Fungus gnats

A few sap-sucking bugs, mostly when the air is warm and dry, and root rot if the soil stays soggy.

Spider mites leave fine webbing and pale speckles on the leaves, and they love dry winter air. Rinse the whole plant in the shower, undersides of the leaves included; if they come back, an insecticidal soap spray is the next step.

Mealybugs look like tufts of white cotton where the leaves meet the stem; scale looks like small brown bumps stuck to the stems. Wipe them off with a cotton swab dipped in rubbing alcohol, then check again next week. Aphids and whiteflies turn up less often; the same shower and soap take care of them.

Powdery mildew, white dusty patches on the leaves, is its most common disease. Cut off the worst leaves, keep water off the leaves when you water, and give it a spot with more air around it.

Feed every 2 weeks in spring and summer, then monthly in fall and winter. In the growing season, tie new stems to a pole or trellis and trim long ones, 4 times a year each. Repot one size up each spring.

• Feed12× a year
• Stake4× a year
• Prune4× a year
• Repot1× a year

An ordinary potting mix that drains fast, in a pot with a drainage hole.

Repot when the roots fill the pot, one pot size up, in spring or summer. That’s the time to add a moss pole if you want it to climb.

Food is optional: a houseplant fertilizer at half strength a few times over spring and summer keeps a fast grower going, and none in winter.

Each green heart-shaped leaf is cut through with oval holes, like its cheesy namesake. The surface has a light gloss, and the vines grow dense enough to cover the soil.