Fertilising guide
How to fertilise Long-Stalked Bladderwort (Utricularia praelonga)— schedule & NPK
Also called Long-stalked bladderwort.
More about long-stalked bladderwort
About Long-Stalked Bladderwort
Utricularia praelonga · also called Long-stalked bladderwort · tropical
Utricularia praelonga is a perennial terrestrial bladderwort native to tropical South America (Brazil and adjacent countries), growing in sandy peat bogs and seasonally flooded meadows. It is distinctive for having two kinds of leaves — long grass-like ones and shorter strap-shaped ones — along with underground bladder traps that capture nematodes and microorganisms. Bright yellow flowers are produced on tall scapes and appear reliably in warm conditions. The most important care fact is that the substrate must remain constantly moist to wet, with the plant performing well in a shallow water tray. Utricularia is not listed in the ASPCA database; classified as mildly-toxic as a precaution.
Growth habit: Terrestrial rosette-forming plant producing long, arching grass-like leaves and shorter strap leaves; underground stolons bear the carnivorous bladder traps.
What fertiliser long-stalked bladderwort actually wants — and why
Long-Stalked Bladderwort 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 long-stalked bladderwort: 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 long-stalked bladderwort, 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 long-stalked bladderwort:
Bladder traps handle nutrient acquisition; no fertiliser needed. In an insect-free environment, a monthly dilute foliar mist of urea-free orchid fertiliser (1/8 strength) in summer is sufficient. Treat that as monthly 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 long-stalked bladderwort 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 long-stalked bladderwort
Half strength is the safe default for long-stalked bladderwort — 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 long-stalked bladderwort first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the long-stalked bladderwort watering schedule.
Signs you are over-feeding long-stalked bladderwort
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for long-stalked bladderwort:
- 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 long-stalked bladderwort
- 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 long-stalked bladderwort care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of long-stalked bladderwort 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 long-stalked bladderwort
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 long-stalked bladderwort — frequently asked questions
What fertiliser does long-stalked bladderwort 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. Long-Stalked Bladderwort 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 long-stalked bladderwort?
Bladder traps handle nutrient acquisition; no fertiliser needed. In an insect-free environment, a monthly dilute foliar mist of urea-free orchid fertiliser (1/8 strength) in summer is sufficient. Bladder traps handle nutrient acquisition; no fertiliser needed. In an insect-free environment, a monthly dilute foliar mist of urea-free orchid fertiliser (1/8 strength) in summer is sufficient. Treat that as monthly 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 long-stalked bladderwort?
Half strength is the safe default for long-stalked bladderwort — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding long-stalked bladderwort 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 long-stalked bladderwort 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 long-stalked bladderwort?
Flush the pot of long-stalked bladderwort 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
- Long-Stalked Bladderwort care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water long-stalked bladderwort — 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 anubias gigantea
- How to fertilise anubias afzelii
- How to fertilise cryptocoryne wendtii 'green'
- All 10153 fertilising guides in the Growli library