Houseplant · Lentibulariaceae
Butterwort
Pinguicula moranensis
Offer it bright light, rainwater, and a lean gritty mix, and the butterwort will quietly clear your gnats for free.
Bright indirect
Every 2–5 days
41–86°F · 5–30°C
USDA 10–11
Overview
Meet a carnivorous houseplant that hunts with glue rather than snapping jaws, which makes it a calm and forgiving companion. Its flat rosette of greasy, sticky leaves catches fungus gnats and small flies, then digests them for the nutrients its lean home soil cannot give. This Mexican species, Pinguicula moranensis, comes from volcanic country and is content to grow on a bright windowsill in your home.
You'll come to know two faces of the same plant across the year, and both are perfectly natural. From spring to autumn it opens wide, glistening carnivorous leaves and lifts slender stalks of pink-violet flowers. As the days grow short, it draws back into a tight, non-sticky succulent rosette and rests through winter on barely any water, so there's no need to fuss over it.
What surprises new growers isn't difficulty, it's simply a different rhythm. Butterworts want the reverse of usual houseplant habits: no fertilizer, no tap water, and no rich potting mix. Once those three are in place, the plant very nearly looks after itself, and you'll feel like a natural.
Care
The short version: give it bright light, only distilled or rainwater, and a lean gritty mineral mix. Keep it evenly damp through the growing season, let it dry out for its gentle winter rosette, and never feed the soil. Get those right and the rest comes easily.
Light
Butterworts are happiest in bright light, ideally bright indirect with a few hours of sun. They take everything from full sun through to partial shade, so you have room to find what works, though leaves grown too dim turn pale and stop making their sticky dew.
Water
Reach only for distilled, reverse-osmosis, or rainwater, never tap, because dissolved minerals slowly build up and harm the plant. Keep the gritty mix evenly damp through the growing season, often by standing the pot in a shallow water tray. In its winter rosette the plant wants far less, watered lightly only when the medium nearly dries, so easing off is exactly right.
Soil
Settle it into a gritty, low-nutrient mineral mix, something like peat or long-fiber sphagnum cut with sharp sand, perlite, and a little pumice. A pH anywhere from 5.0 to 7.0 is comfortable. Skip rich potting soil altogether, because the roots are made for lean ground and will thank you for it.
Temperature
This Mexican species is easygoing across a wide range, from about 41°F to 86°F (5°C to 30°C). That generous span makes it forgiving of the ordinary swings in a home, so long as it never freezes.
Humidity
Despite the carnivorous reputation, it asks for no terrarium and no special setup. Average household humidity of 40% to 60% suits it just fine, and good airflow matters far more than chasing a high number.
Feeding
There's no fertilizing to do, which is one less thing to worry about. The plant feeds itself by catching fungus gnats and small flies on its leaves, and adding feed to the pot only burns the roots.
Pruning
There's no shaping needed at all. Simply pick off dead, blackened, or rotted leaves and spent flower stalks now and then, and that small habit keeps fungal rot from getting a foothold.
Repotting
Repot every 1 to 2 years, best done in spring as growth resumes. Move it on when the mix breaks down and stays soggy, when the rosette crowds the pot edge, or when new leaves stop turning sticky, and the plant will pick right back up.
Size & spacing
This is a small, manageable plant, reaching only 2 to 10 inches (5 to 25 cm) tall and spreading 3 to 6 inches (8 to 15 cm) across. A single rosette tucks comfortably into a modest pot on a windowsill.
Troubleshooting
Almost every butterwort hiccup traces back to water, feeding, or the seasons, so please don't feel discouraged if something looks off. Read the signs against the list below before reaching for a fix, because the wrong response, like more water or fertilizer, tends to make things harder. Most setbacks here are gentle and recoverable.
A blackened, mushy crown that gives way
Take heart, because this familiar problem is crown rot, and it nearly always comes down to water. Tap or mineral water leaves salts behind in the lean mix, and a pot kept too wet during the winter rosette phase finishes the job. The good news is you can turn it around: switch to distilled or rainwater, flush the medium, repot into fresh gritty mix, and trim away any soft brown tissue.
Fix:
- Stop watering until the mix is barely moist
- Flush the medium with distilled/RO water to leach salts
- Repot into fresh gritty mineral mix and remove rotted tissue
- Increase airflow and light
New leaves losing their sticky dew
If fresh leaves arrive dry and dull, please don't worry, because the plant is simply telling you about mineral buildup or feeding. Fertilizer and rich soil burn the roots, tap water loads the mix with salts, and weak light slows the whole plant down. Each of these is an easy fix: never feed the soil, flush with distilled or rainwater, and give the plant a spot with several hours of bright light.
Fix:
- Never fertilize the soil
- Switch to distilled/RO/rain water and flush the mix
- Move to a brighter spot with several hours of bright light
Leaves shrinking into small succulent rosettes in autumn
You can relax completely here, because this is the winter succulent phase and not a problem at all. As the days grow shorter, the plant simply swaps its sticky carnivorous leaves for a tight, non-sticky rosette and settles in to rest through the cold months. Ease off the water until the mix nearly dries, keep it in bright light, and welcome normal watering back in spring.
Fix:
- Reduce watering and let the mix nearly dry
- Keep in bright light and resume normal moisture in spring
Toxicity
Wonderful news if you share your home with animals: the butterwort is not toxic to pets or people. The sticky leaves catch only gnat-sized insects and hold nothing harmful, so the one good reason to keep it out of reach is simply to protect the fragile rosette from curious paws.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
A curious cat might lick or pat the sticky leaves, and the worst that happens is a slightly tacky tongue. You can rest easy, because there is no toxin here.
Dogs None
Your dog is perfectly fine around this plant. It holds no poison, and a chewed leaf only leaves a harmless greasy taste behind.
Horses Safe
Horses come to no harm near it, though the small rosette is far too delicate to survive a grazing muzzle, so a high shelf protects the plant.
Rabbits Safe
Gentle and harmless to rabbits. A nibbled leaf will not hurt your bunny in the slightest, even if it costs the plant a little.
Livestock Safe
Cattle, goats, and sheep are all safe with it. The plant carries nothing toxic, and as a tray-grown houseplant it almost never crosses their path.
Birds Safe
Birds have nothing to fear from the leaves or flowers. The sticky surface only catches gnat-sized insects and never anything larger.
People Safe
You can handle it freely with bare hands, and the leaf just feels a little greasy. It is not a food plant, so no part is meant for eating.
The greasy, sticky leaf surface is harmless to handle and to pets; it simply feels tacky.
Varieties
Most growers come to know the butterwort through one of a few common forms, and any of them is a kind place to begin. These are the ones you're most likely to find by name.
Pinguicula moranensis
The well-loved large-flowered Mexican butterwort, lifting pink-violet blooms above a flat summer rosette of greasy leaves.
Pinguicula moranensis var. neovolcanica
A recognized variety from the Mexican volcanic ranges, accepted on Kew's Plants of the World Online.
Pinguicula 'Tina'
A willing, vigorous hybrid that beginners adore for being an easy, gnat-catching houseplant.
How to propagate
Making more butterworts is genuinely easy, and the simplest method costs you nothing but a few leaves from a plant you already love. It's a confidence-building first step for any new grower.
Leaf cuttingsEasy
Late winter to spring, especially from the succulent winter rosette · 4-8 weeks to form plantlets
This is the gentlest, most forgiving way to make more butterworts, so it's a lovely place to start. Carefully tug whole leaves from the base in late winter or spring, while the plant rests in its succulent rosette, and lay them on damp gritty mix. Tiny new rosettes appear at the leaf base within 4 to 8 weeks, and watching them arrive is half the joy.
DivisionEasy
Spring at repotting · 2-4 weeks
Mature plants often grow offset rosettes around the parent, almost as a gift to you. At spring repotting, gently separate these clusters and pot each one on its own, and they happily settle in within 2 to 4 weeks.
SeedDemanding
Spring on the surface of damp mineral mix · Several months to a year
Seed asks for patience more than skill. Surface-sow the fine seed on damp mineral mix in spring and let it take its time, because growing on can stretch from several months to a year. It is less reliable than leaf pullings, yet it rewards you when you'd love many plants at once.
Myths
You have to hand-feed butterworts insects or fertilize them to keep them alive.
You can let that worry go, because the sticky leaves catch their own fungus gnats and small flies, and that is every bit of feeding the plant needs. Never fertilize the soil, since the roots are made for lean ground and extra nutrients only burn them.
Butterworts are toxic to cats and dogs.
Happily, Pinguicula isn't on the ASPCA toxic plant list and is treated as non-toxic to pets. The leaves catch only tiny insects and hold nothing that could harm a curious animal.
Every carnivorous plant needs a sealed, humid terrarium.
There's no need for special equipment, because Mexican butterworts do beautifully in ordinary household humidity as long as they have low-mineral water and bright light. A sealed case often does more harm than good by trapping stale, rot-friendly air.