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Swiss cheese plant
Caution🐾Fensterblatt · (Monstera deliciosa)
Arum family (Araceae)
Description
As a climbing aroid, the Swiss cheese plant scales tree trunks in tropical forests, its broad leaves developing ever more pronounced holes and slits as it matures — a growth pattern that also gives it its striking look as a houseplant. Easy to care for and evergreen year-round, it has been studied for a modest contribution to indoor air quality. The ripe, finger-shaped fruit is edible and tastes like a mix of pineapple and banana, but unripe fruit strongly irritates the mouth and throat due to fine needle-shaped calcium oxalate crystals (raphides). These crystals occur in nearly all other plant parts and cause burning, swelling, salivation and difficulty swallowing on ingestion or contact with mucous membranes. Because dogs and cats show the same symptoms, the plant is listed as toxic to pets, so it should be kept out of reach of children and animals.
Monstera deliciosa is one of the most popular tropical houseplants worldwide. Its large, glossy leaves with characteristic holes (fenestrations) and slits give living spaces a jungle-like atmosphere. Since the rise of social media, the plant has become an icon of the urban-jungle and biophilic-design trends and is widely used to enhance interior aesthetics and support wellbeing.
Monstera deliciosa is regarded as a particularly low-maintenance houseplant: it tolerates partial shade, forgives irregular watering, and grows reliably even at standard indoor humidity. This resilience makes it an ideal beginner plant for homes, offices, and public interiors.
Like many large-leaved tropical plants, Monstera deliciosa can release water vapour indoors and trap dust on its leaf surfaces. A specific uptake of individual indoor pollutants by Monstera deliciosa is NOT documented in the NASA Clean Air Study; its contribution to indoor air should therefore be understood as general and not as therapeutic air purification.
In its native range (Mexico, Central America), the fully ripe fruit of Monstera deliciosa is traditionally eaten. The ripe inflorescence/fruit (spadix) develops after 12 to 14 months a soft, pineapple- to banana-flavoured pulp — the epithet deliciosa (delicious) refers to this culinary use. CAUTION: only the fully ripe fruit; unripe fruit and all other plant parts contain irritating calcium oxalate raphides.
Monstera deliciosa is deliberately used in indoor-plant and biophilic-design concepts to make interiors greener and more inviting. The presence of large green plants is popularly associated with stress reduction and wellbeing; specific clinical effects of individual species are however not established.
WARNING (not a use, but a safety notice): All parts of Monstera deliciosa except the fully ripe fruit contain insoluble calcium oxalate raphides. On contact with the oral or gastrointestinal mucosa they cause mechanical irritation, burning, salivation, and swelling. Keep the plant out of reach of children and pets.
All plant parts except the fully ripe fruit contain calcium oxalate raphides (needle-shaped crystals stored in specialised idioblast cells). On ingestion or contact with mucous membranes: burning, swelling, salivation, and difficulty swallowing; skin contact with the sap can cause irritation. Dogs and cats develop the same symptoms, which is why Monstera deliciosa is listed as toxic to pets. Unripe fruit strongly irritates mouth and throat; only the fully ripe, soft fruit is edible. ASPCA classification (accessed 2026-08-10): toxic to dogs and cats.
No specific safety data on consumption of the ripe fruit during pregnancy. Strictly avoid all other plant parts due to calcium oxalates.
No specific safety data during lactation. As a precaution, use only as an ornamental; ingestion is not necessary.
Calcium oxalate raphides can cause severe oral and throat irritation in children. Keep the plant out of reach of small children; do not leave any plant parts (other than fully ripe fruit) accessible.
Contraindications
- Consumption of unripe fruit or any other plant parts (leaf, stem, aerial root) due to calcium oxalate raphides.
- Known hypersensitivity to Araceae (arum family) plants.
Harvested part: whole plant (decorative)
- Time of day:
- Possible year-round in the native range (Mexico, Central America); under indoor cultivation in Central Europe fruit set is rare. Ready to harvest after 12-14 months when the hexagonal green scales detach from the spadix and reveal the white pulp — unripe before that and strongly irritant.
- Drying:
- Detach pieces of ripe fruit from the spadix as the scales come away and eat fresh or store cool. Not dried — culinary use is exclusively as fresh fruit.
- Storage:
- Ripe pieces keep 2-3 days refrigerated; the fruit does not ripen all at once but section by section.
- calcium oxalate raphidesOtherContent: 0.5-2 %Whole plant
Insoluble, needle-shaped calcium oxalate crystals (raphides) bundled inside specialised idioblast cells. When the tissue is chewed or crushed they are propelled ballistically into the mucosa, causing mechanical irritation and burning — the principal mechanism of toxicity in humans and pets.
- oxalic acidOtherWhole plant
Oxalic acid occurs in small amounts in leaf and stem alongside the crystalline calcium oxalates and intensifies the irritant effect; it is a known constituent of many Araceae.
- proteolytic idioblast proteinsOtherWhole plant
Alongside the raphides, the idioblast cells are thought to release irritant proteins that amplify the mucosal reaction. This co-factor explains why pure calcium oxalate alone does not fully account for the acute symptoms.
- sugars (fructose, glucose, sucrose)OtherFruit
The fully ripe fruit contains simple sugars (fructose, glucose, sucrose) that give it the sweet, pineapple- to banana-like flavour and underpin its culinary use in Mexico.
- vitamin CVitaminFruit
The ripe fruit provides small amounts of vitamin C and other micronutrients and is eaten as fruit in the native range.
- flavonoidsFlavonoidLeaf
Araceae-typical flavonoids have been detected in the leaves; they contribute to the antioxidant activity of leaf extracts but are not pharmacologically characterised in detail.
- [3]MonographMonstera deliciosa Liebm. — Plants of the World Online (Kew)(accessed: 2026-05-27)
- [4]MonographMonstera deliciosa — Missouri Botanical Garden Plant Finder(accessed: 2026-05-27)
- [5]MonographMonstera deliciosa — Royal Horticultural Society (RHS) Plant Finder(accessed: 2026-05-27)
- [6]MonographMonstera deliciosa — Toxic and Non-Toxic Plants (ASPCA)(accessed: 2026-05-27)
- [7]MonographASPCA Animal Poison Control — Ceriman (Monstera deliciosa)(accessed: 2026-08-10)
- [8]MonographCliniTox Giftpflanzen — Monstera deliciosa Liebm.: giftig + (Institut für Veterinärpharmakologie und -toxikologie, Universität Zürich)(accessed: 2026-08-10)
- [1]WikipediaGewöhnliches Fensterblatt (Wikipedia DE)(accessed: 2026-05-27)
- [2]WikipediaMonstera deliciosa (Wikipedia EN)(accessed: 2026-05-27)
🪴 Grow at home
- ☀ Light
- bright, indirect
- 💧 Water
- weekly
- 🌱 Soil
- Well-draining potting compost mixed with perlite or coarse sand
- 🪴 Pot
- 30 cm
- ⭐ Difficulty
- ★★☆ intermediate
- 🐾 Pets
- toxic to pets
Tips:
- Monstera deliciosa is not frost-hardy and in Central Europe and Bulgaria can only be grown as a houseplant — temperatures below 10 °C damage the plant.
- Bright, indirect light encourages the characteristic leaf perforations — direct midday sun scorches the leaves.
- Do not remove aerial roots — they can be guided into the soil and supply the plant with additional nutrients.
- Regular misting increases humidity and maintains the plant's tropical character.
- Fertilise every 4–6 weeks during the growing season (spring/summer).
Care tips are general indoor-gardening recommendations, not scientific sources.