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Plant care

Three-Coloured Bladderwort (Three-colored bladderwort) care

Utricularia tricolor

Also called Three-coloured bladderwort, Three-colored bladderwort.

RHS H1bUSDA 10-12Mildly toxic to petsIndoor Rosette spreads 5–10 cm across

Watering rhythm

Bright indirect light (just back from a sunny window)

Keep substrate consistently moist; water tray method year-round

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Light

Bright indirect light (just back from a sunny window)

Soil

1:1 sphagnum peat and perlite or fine silica sand

Humidity

50–80%

Temp

10–30°C

Pet safety

Mildly toxic to pets

Mature size

Rosette spreads 5–10 cm across

Care at a glance

Light

In the wild three-coloured bladderwort grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Provide bright indirect or gentle direct light for 5–8 hours per day; strong direct midday sun in summer should be filtered to prevent leaf scorch, while insufficient light prevents flowering. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for keep substrate consistently moist; water tray method year-round for three-coloured bladderwort, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Sit the pot in a shallow tray containing 1–2 cm of rainwater, distilled water, or reverse-osmosis water at all times; top up the tray before it dries and never use tap water.

Soil and pot

Three-Coloured Bladderwort grows best in 1:1 sphagnum peat and perlite or fine silica sand. Use a nutrient-free, acidic, freely draining mix such as 50% sphagnum peat and 50% perlite; do not add compost, soil, or fertiliser of any kind. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Three-Coloured Bladderwort sits happiest at around 50–80% humidity and 10–30°C (50–86°F). Moderate to high humidity suits this species well; standing the tray on wet gravel or growing in a semi-closed terrarium helps maintain the ambient moisture this South American species prefers. If you keep the room above 10–30°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed three-coloured bladderwort sparingly. Do not fertilise; nutrient-poor conditions are essential — any added fertiliser will burn roots and kill the plant. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on three-coloured bladderwort in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot from mineral water or stagnant trays — Tap water salts and algae buildup in the water tray can cause root damage; flush the tray weekly with fresh distilled or rainwater and replace the growing medium if the roots turn brown and mushy.
  • No flowers produced — Insufficient light is the most common cause of failure to bloom; move the plant to a brighter position with at least 5 hours of bright indirect light daily, and ensure the growing medium has not become over-saturated or anaerobic.

Propagation

Divide clumps at repotting in spring, or let stolons spread naturally across the surface of a fresh tray of moist peat-sand mix; seed can be surface-sown on moist peat under bright light. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Three-Coloured Bladderwort is mildly toxic to pets. Utricularia tricolor is not listed in the ASPCA Toxic and Non-Toxic Plant database. No specific toxic compounds have been identified, but as the genus is absent from authoritative pet-safety databases a mildly-toxic rating is applied as a precaution; seek veterinary advice if a pet ingests any part of the plant. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Three-Coloured Bladderwort care — frequently asked questions

What is the common name for Utricularia tricolor?

Utricularia tricolor is most commonly called Three-Coloured Bladderwort, but it is also known as Three-coloured bladderwort, Three-colored bladderwort. The names refer to the same species, so care instructions for Three-Coloured Bladderwort apply identically to anything sold as Three-colored bladderwort.

How much light does three-coloured bladderwort need?

Three-Coloured Bladderwort grows best in bright indirect light (just back from a sunny window). Provide bright indirect or gentle direct light for 5–8 hours per day; strong direct midday sun in summer should be filtered to prevent leaf scorch, while insufficient light prevents flowering.

How often should I water three-coloured bladderwort?

Water three-coloured bladderwort keep substrate consistently moist; water tray method year-round. Sit the pot in a shallow tray containing 1–2 cm of rainwater, distilled water, or reverse-osmosis water at all times; top up the tray before it dries and never use tap water. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is three-coloured bladderwort toxic to cats and dogs?

Three-Coloured Bladderwort is mildly toxic to pets. Utricularia tricolor is not listed in the ASPCA Toxic and Non-Toxic Plant database. No specific toxic compounds have been identified, but as the genus is absent from authoritative pet-safety databases a mildly-toxic rating is applied as a precaution; seek veterinary advice if a pet ingests any part of the plant.

What USDA hardiness zone does three-coloured bladderwort grow in?

Three-Coloured Bladderwort is rated for USDA zone 10-12 (indoor in most climates) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Three-Coloured Bladderwort deep-dive guides

Every aspect of three-coloured bladderwort care, each with its own calibrated guide:

Featured in these plant shortlists

Three-Coloured Bladderwort qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Three-Coloured Bladderwort is also commonly called Three-coloured bladderwort or Three-colored bladderwort.