Fertilising guide
How to fertilise Mexican Butterwort (Pinguicula moranensis)— schedule & NPK
Also called Mexican Butterwort, Butterwort, Ping, Pinguicula.
More about mexican butterwort
About Mexican Butterwort
Pinguicula moranensis · also called Mexican Butterwort, Butterwort · houseplant
Mexican butterwort is a carnivorous rosette plant whose sticky, gland-covered leaves trap fungus gnats and small flies. Give it bright light, a mineral (peat-and-sand) mix, and distilled or rainwater only — never tap. It is not on the ASPCA list either way, so treat it as mildly toxic and confirm with a vet.
Growth habit: Low, flat carnivorous rosette of soft, sticky, gland-covered leaves that lie close to the soil. It is heterophyllous: large carnivorous "summer" leaves in the warm growing season give way to a tight, glandless succulent "winter" rosette during its dry dormancy. Sends up tall, single pink-purple flowers on slender stalks.
Watch for — Tap-water mineral burn: The most common killer. Dissolved salts from tap or filtered water build up in the lean mix and scorch the roots and leaves. Water only with distilled water, rainwater, or RO.
What fertiliser mexican butterwort actually wants — and why
Mexican Butterwort is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.
A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for mexican butterwort: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed mexican butterwort, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For mexican butterwort:
Do not fertilise the soil — root feeding burns the plant. It gathers nutrients by catching small insects (fungus gnats, fruit flies) on its sticky leaves, which also makes it a handy living gnat trap indoors. If growth is weak, experienced growers mist a very dilute foliar cactus/orchid feed onto the leaves only, never the roots. The pattern that matters: feed little and often through active growth and budding — sparingly through the growing season — and ease right off during the rest period that triggers the next flush.
The dormant-season rule matters more than the exact interval: skip feeding entirely when mexican butterwort is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for mexican butterwort
Very dilute — quarter strength, the classic "weakly, weekly" approach for mexican butterwort. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
Feeding always goes onto already-damp soil, never dry roots — water mexican butterwort first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mexican butterwort watering schedule.
Signs you are over-feeding mexican butterwort
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mexican butterwort:
- Lush green leaves but few or no flowers (too much nitrogen).
- Brown, scorched leaf tips and edges — a classic fine-root burn.
- White salt crust on the medium or pot, and stalled buds.
- Bud blast: buds forming then shrivelling and dropping.
Signs you are under-feeding mexican butterwort
- Sparse or no flowering despite good light and the right season.
- Smaller, paler new leaves and a generally weak, tired plant.
- Flowers that are smaller or fade faster than they should.
If the symptoms point at watering, light or roots rather than nutrition, the full mexican butterwort care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Specialist and bloom feeds leave salts that scorch fine roots — flush mexican butterwort thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Organic vs synthetic feeds for mexican butterwort
Organic options
Gentler options exist: a dilute seaweed feed (mildly potassium-rich) or worm-casting tea. UK: Westland seaweed, or a dilute tomato feed like Tomorite for bud-formers; US: Espoma Orchid! / Violet! or Neptune's Harvest. Lower burn risk, slower response.
Synthetic / liquid feeds
A species-matched bloom feed at quarter strength — UK: Baby Bio Orchid / African Violet food, or a high-potash Tomorite/Phostrogen for budding bloomers; US: Miracle-Gro Orchid or Bloom Booster, Schultz African Violet.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising mexican butterwort — frequently asked questions
What fertiliser does mexican butterwort need?
A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers. Mexican Butterwort is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.
How often should I feed mexican butterwort?
Do not fertilise the soil — root feeding burns the plant. It gathers nutrients by catching small insects (fungus gnats, fruit flies) on its sticky leaves, which also makes it a handy living gnat trap indoors. If growth is weak, experienced growers mist a very dilute foliar cactus/orchid feed onto the leaves only, never the roots. Do not fertilise the soil — root feeding burns the plant. It gathers nutrients by catching small insects (fungus gnats, fruit flies) on its sticky leaves, which also makes it a handy living gnat trap indoors. If growth is weak, experienced growers mist a very dilute foliar cactus/orchid feed onto the leaves only, never the roots. The pattern that matters: feed little and often through active growth and budding — sparingly through the growing season — and ease right off during the rest period that triggers the next flush.
What strength of feed for mexican butterwort?
Very dilute — quarter strength, the classic "weakly, weekly" approach for mexican butterwort. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
What does over-feeding mexican butterwort look like?
Lush green leaves but few or no flowers (too much nitrogen). Brown, scorched leaf tips and edges — a classic fine-root burn. White salt crust on the medium or pot, and stalled buds. Bud blast: buds forming then shrivelling and dropping. Using an ordinary high-nitrogen houseplant feed on mexican butterwort is the headline mistake — you get a healthy-looking plant that simply refuses to bloom. The second is feeding through the rest period and breaking the dormancy cue it needs to set buds.
Should I flush the soil of mexican butterwort?
Specialist and bloom feeds leave salts that scorch fine roots — flush mexican butterwort thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Keep reading
- Mexican Butterwort care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water mexican butterwort — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 609 fertilising guides in the Growli library