Notched Butterwort (Mexican butterwort) care

Light

The Goldilocks zone. Not the south-facing windowsill (too hot, too direct), not the back of the room (too dim, growth stalls). In habitat it grows beneath larger plants in dappled cloud forest shade. Indoors, provide moderate to bright indirect light — a north- or east-facing windowsill, or placed 30-40 cm below a grow light. Avoid any prolonged direct sun, which bleaches and damages the cupped leaves. If you can't decide, a free phone lux-meter app aimed at the leaf at noon should read between 800 and 1,500 lux.

Watering

Watering notched butterwort: keep consistently moist; reduce slightly in cooler months. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Unlike many Mexican Pinguicula, P. emarginata originates in a cooler, wetter cloud forest and does not undergo full dry dormancy. Keep the substrate consistently damp with distilled or rainwater throughout the year, using shallow tray watering; reduce (but do not eliminate) watering in winter.

Soil and pot

Notched Butterwort grows best in moisture-retentive but well-draining mix. A mix of 50% coarse perlite, 30% sphagnum peat, and 20% coarse silica sand suits its preference for a slightly more moisture-retentive substrate than gypsum-specialist relatives. Adding a small amount of crushed limestone or oyster shell improves results, reflecting the limestone bank habitat. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Notched Butterwort sits happiest at around 60-85% humidity and 10-25°C (50-77°F). Higher humidity than most Mexican butterworts is beneficial, reflecting the cloud forest origin. Aim for 60-80% indoors using a pebble-water tray, cloche, or growing in a terrarium. Adequate airflow is still essential to prevent fungal disease. If you keep the room above 10 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed notched butterwort sparingly. Traps small invertebrates naturally; supplement indoors with tiny live or dried prey on the sticky leaves, or quarter-strength foliar orchid fertiliser applied to the leaf surface every 2-3 weeks during the active growing season. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on notched butterwort in the Growli community. Each is annotated with the most common cause so you know where to start.

• Leaf browning from low humidity — Unlike drier-habitat Mexican Pinguicula, P. emarginata dislikes low humidity; leaf margins begin to brown and curl if ambient humidity drops below 50% for extended periods. Use a humidity tray or locate in a naturally humid room such as a bathroom with good indirect light.
• Crown fungal rot — The combination of high humidity and poor airflow can trigger grey mould (Botrytis) in the cupped rosette centre. Ensure gentle air movement around the plant, avoid overhead watering onto the leaves, and remove any dying leaf tissue promptly.

Propagation

Leaf pullings on moist mineral substrate produce plantlets in 6-8 weeks. The plant also spreads by offsets; multiple rosettes can be separated at repotting time in spring. Seed germinates on a moist peat-perlite surface. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Notched Butterwort is mildly toxic to pets. Pinguicula emarginata is not specifically listed in the ASPCA Toxic and Non-Toxic Plant database. The genus Pinguicula is not a recognised highly toxic group. Ingestion may cause mild, transient gastrointestinal upset in cats and dogs. A precautionary mildly-toxic rating is applied. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Notched Butterwort deep-dive guides

Every aspect of notched butterwort care, each with its own calibrated guide:

• Common notched butterwort problems & fixes
• Notched Butterwort watering schedule
• Notched Butterwort light requirements
• Best soil mix for notched butterwort
• Notched Butterwort fertilizing guide
• When to repot notched butterwort
• How to propagate notched butterwort
• How to prune notched butterwort
• What's eating my notched butterwort?
• Notched Butterwort growth rate & size
• Notched Butterwort cold hardiness
• Notched Butterwort temperature & humidity
• Is notched butterwort toxic to cats & dogs?
• Is notched butterwort toxic to cats?
• Is notched butterwort toxic to dogs?
• All 28 Pinguicula varieties

Featured in these plant shortlists

Notched Butterwort qualifies for 7 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Best succulents for beginners — The easiest succulents and cacti to keep alive — selected by documented growth habit, each with the light and watering it actually wants.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Notched Butterwort is also commonly called Notched butterwort or Mexican butterwort.

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