Fertilising guide
How to fertilise Crystal Butterwort (Pinguicula crystallina)— schedule & NPK
Also called crystal butterwort.
More about crystal butterwort
About Crystal Butterwort
Pinguicula crystallina · also called crystal butterwort · houseplant
Pinguicula crystallina is a Mediterranean-type butterwort native to Cyprus, producing flat rosettes of pale green, glistening leaves studded with sticky glands that trap small insects. It forms a dry winter succulent rosette, switching to carnivorous leaves in spring. An adaptable, easy-to-grow beginner butterwort that tolerates bright indirect light and moderate humidity.
Growth habit: Flat basal rosette; produces non-carnivorous succulent leaves in summer and large carnivorous leaves in the cool growing season
What fertiliser crystal butterwort actually wants — and why
Crystal 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 crystal 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 crystal 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 crystal butterwort:
Small insects (fungus gnats, fruit flies, springtails) landing on the sticky leaves supply adequate nutrients during the growing season. No soil fertiliser needed. Specialist growers occasionally mist dilute orchid fertiliser (1/10 strength) on leaves during active carnivorous 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 crystal 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 crystal butterwort
Half strength is the safe default for crystal 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 crystal butterwort first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the crystal butterwort watering schedule.
Signs you are over-feeding crystal butterwort
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for crystal 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 crystal 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 crystal butterwort care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of crystal 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 crystal 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 crystal butterwort — frequently asked questions
What fertiliser does crystal 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. Crystal 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 crystal butterwort?
Small insects (fungus gnats, fruit flies, springtails) landing on the sticky leaves supply adequate nutrients during the growing season. No soil fertiliser needed. Specialist growers occasionally mist dilute orchid fertiliser (1/10 strength) on leaves during active carnivorous growth. Small insects (fungus gnats, fruit flies, springtails) landing on the sticky leaves supply adequate nutrients during the growing season. No soil fertiliser needed. Specialist growers occasionally mist dilute orchid fertiliser (1/10 strength) on leaves during active carnivorous 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 crystal butterwort?
Half strength is the safe default for crystal butterwort — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding crystal 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 crystal 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 crystal butterwort?
Flush the pot of crystal 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
- Crystal Butterwort care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water crystal 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