Photo: Petr Dlouhý / CC BY-SA 3.0

Rabbit Bladderwort Care

Utricularia sandersonii · Lentibulariaceae

🐾 Pet-safe 🎯 Easy ☀️ Bright indirect 💧 Every 2–4 days

🕮 8 min read 🕓 Last reviewed: 2026-08-23

Care at a glance

Watering

Every 2–4 days

Light

Bright indirect

Temperature

8–30 °C (46–86 °F)

Humidity

High

Soil

nutrient-free carnivorous mix (peat and perlite, no lime or fertiliser)

Difficulty

Easy

Mature size

3–10 cm (1–4 in)

Pet safety

Pet-safe

Care effort Medium

The short version

Beginner-friendly and forgiving.
Give it Bright indirect.
Water every 2–4 days.
Safe around cats and dogs.

The Rabbit Bladderwort (Utricularia sandersonii) is a popular houseplant from the Lentibulariaceae family, native to South Africa. It is rated Easy to grow and typically reaches 3–10 cm indoors. Here is everything you need to keep it healthy — watering, light, humidity, feeding, propagation, and pet safety. It is a Fast grower, putting on most of its growth in the warm, bright months of spring and summer.

Also known asUtricularia sandersoniiウサギゴケ兔子狸藻UtriculariaUtriculaire de Sanderson

📋Quick facts

Growth rate	Fast
Mature size	3–10 cm (1–4 in)
Native region	South Africa
Plant family	Lentibulariaceae
Toxicity	Non-toxic
Air-purifying	No
Ideal for	beginners, homes with pets, a pop of colour

⚖️Pros & cons

Pros

Non-toxic to cats and dogs
Hard to kill; great for beginners
Fast, rewarding growth
Flowers indoors
Compact — fits a desk or shelf

Cons

Needs high humidity to look its best
Needs frequent watering

💧Watering

Water your Rabbit Bladderwort roughly every 2–4 days, letting the top few centimetres of soil dry out between waterings. Always empty the saucer so the roots never sit in water — overwatering is the most common way this plant is lost.

Not sure when to water? Push a finger 2–3 cm into the soil and water only when it feels dry at that depth — a cheap moisture meter or the weight of the pot works too. Water thoroughly until it runs from the drainage holes, then tip away anything left in the saucer. Soft, yellowing lower leaves usually mean too much water; crispy, curling leaves usually mean too little. Always ease off in the darker months, when the plant drinks far less.

Never forget to water

Adds a repeating event to Google Calendar every 3 days.

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☀️Light & placement

The Rabbit Bladderwort likes bright, indirect light — near a window but out of direct midday sun, which can scorch the leaves.

Set it right beside an east window, or just back from a south/west one behind a sheer curtain, so it gets plenty of light without direct midday rays on the leaves. Rotate the pot weekly for even growth, and dust the leaves so they can drink in the light.

🌡️Temperature & humidity

Keep it between 8–30 °C and away from cold draughts and heating vents. It prefers High humidity; if your air is dry, group it with other plants or use a humidifier.

🪴Soil & feeding

Plant it in nutrient-free carnivorous mix (peat and perlite, no lime or fertiliser). Feed with no fertiliser — feeding can harm this plant, and stop feeding in autumn and winter when growth slows.

🗓️Season-by-season care

Season	Watering	What to do
Spring (Mar–May)	Resume regular watering as growth restarts.	The main growing season begins — start feeding again, repot if it is pot-bound, and take cuttings now for the best success.
Summer (Jun–Aug)	This is the thirstiest season; check the soil more often.	Keep feeding on schedule, watch for pests in the warmth, and shield the leaves from scorching midday glass. Higher humidity is welcome.
Autumn (Sep–Nov)	Let the soil dry a little longer between waterings.	Taper off feeding as growth slows, and move the plant away from cold windows and doorways before the first chills.
Winter (Dec–Feb)	Water sparingly — overwatering now is the number-one killer.	Stop feeding, give it the brightest spot you have, and keep it away from radiators, heat vents, and cold draughts.

🪟Repotting

Repot roughly every 1–2 years, ideally in spring as growth picks up. Move up just one pot size (2–3 cm wider) with drainage holes — too big a pot holds water and invites root rot. Signs it is time: roots creeping from the drainage holes or circling the surface, water running straight through, or growth that has stalled. In the years you do not repot, scrape off and replace the top few centimetres of soil.

✂️How to propagate, step by step

Spring and early summer, during active growth, give the best success. Here is how to do it, step by step:

division at repotting

Water the plant the day before to reduce stress on the roots.
Slide it out of its pot and gently shake off the loose soil.
Tease the root ball into sections, each with healthy roots and a few shoots.
Pot each section into fresh mix at its original depth.
Water them in and keep out of direct sun for a week while they recover.

seed

Sow fresh seed onto the surface of moist, fine seed-starting mix.
Cover lightly only if the seed needs darkness; most need warmth of 20–25 °C.
Keep humid under a clear cover in bright, indirect light.
Germination ranges from days to months depending on the species — be patient.
Prick seedlings out into their own small pots once they have a few true leaves.

🔬Classification

Plant type	Carnivorous plant
Genus	Utricularia
Family	Lentibulariaceae · Lentibulariaceae
Native to	South Africa

🩺Common problems

Symptom	Likely cause	What to do
Algae on leaves or glass	Too much light or excess nutrients in the water	Cut the lighting period, reduce feeding, and add algae-eating clean-up crew.
Will not flower	Too little light, or it is not mature yet	Give it brighter light and be patient through a season.
Drooping or wilting	Too little (or too much) water	Check the soil: water if dry, ease off if soggy.

🩺 Plant Doctor →

🐛Pests & prevention

The usual indoor pests are spider mites (fine webbing, speckled leaves), mealybugs (white cotton-wool tufts), scale (small brown bumps), and fungus gnats (tiny flies from soggy soil). Inspect any new plant before it joins the others, wipe the leaves now and then, and let the topsoil dry to keep gnats away. At the first sign, isolate the plant, wipe or rinse off what you can, and treat with insecticidal soap or neem oil every week until it is clear.

🐾Is it safe for pets?

Good news for pet owners: the Rabbit Bladderwort is considered non-toxic to both cats and dogs by the ASPCA. It is one of the safer choices for homes with animals, though eating any plant can still cause mild stomach upset.

Toxicity information is a general guide based on ASPCA data. If your pet or child may have eaten any part of a plant, contact a vet or poison control right away.