Fertilising guide
How to fertilise large-flowered butterwort (Pinguicula grandiflora)— schedule & NPK
Also called large-flowered butterwort, greater butterwort.
More about large-flowered butterwort
About large-flowered butterwort
Pinguicula grandiflora · also called large-flowered butterwort, greater butterwort · houseplant
A cold-hardy European carnivorous perennial native to the limestone mountains of Ireland, western France, and northern Spain, Pinguicula grandiflora produces showy violet-blue flowers up to 2.5 cm across in late spring. It forms winter hibernacula and tolerates hard frost, making it one of the few butterworts suited to outdoor temperate gardens.
Growth habit: Cold-temperate rosette-forming perennial; produces winter hibernacula (tight, non-carnivorous resting buds) at the base through which it overwinters, even when frozen solid.
Watch for — Mineral salt build-up: Using tap water gradually deposits calcium and magnesium salts that kill the plant. Always use rainwater or distilled water and flush the pot occasionally with pure water to prevent salt accumulation.
What fertiliser large-flowered butterwort actually wants — and why
large-flowered butterwort is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 large-flowered 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 large-flowered 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 large-flowered butterwort:
No fertiliser required. The plant captures invertebrates on its sticky leaves. Supplemental feeding with small live or dried insects is beneficial indoors; place 1–2 small prey items on the leaves every few weeks during active growth. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when large-flowered 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 large-flowered butterwort
Half strength is the safe default for large-flowered butterwort — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water large-flowered butterwort first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the large-flowered butterwort watering schedule.
Signs you are over-feeding large-flowered butterwort
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for large-flowered butterwort:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding large-flowered butterwort
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full large-flowered butterwort care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of large-flowered butterwort with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for large-flowered butterwort
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 large-flowered butterwort — frequently asked questions
What fertiliser does large-flowered butterwort need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. large-flowered butterwort is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed large-flowered butterwort?
No fertiliser required. The plant captures invertebrates on its sticky leaves. Supplemental feeding with small live or dried insects is beneficial indoors; place 1–2 small prey items on the leaves every few weeks during active growth. No fertiliser required. The plant captures invertebrates on its sticky leaves. Supplemental feeding with small live or dried insects is beneficial indoors; place 1–2 small prey items on the leaves every few weeks during active growth. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for large-flowered butterwort?
Half strength is the safe default for large-flowered butterwort — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding large-flowered butterwort look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding large-flowered butterwort year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of large-flowered butterwort?
Flush the pot of large-flowered butterwort with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- large-flowered butterwort care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water large-flowered butterwort — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 6887 fertilising guides in the Growli library