Aquatic Bladderwort (Utricularia) Care Guide
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Aquatic bladderworts (Utricularia) are rootless, floating carnivorous plants that catch microscopic prey in tiny underwater bladder traps. They grow well in tubs, ponds, and aquariums as long as the water stays soft and clean.
Water
Use distilled, reverse osmosis, or rain water only. Utricularia thrives in slightly acidic water, around pH 5 to 7. Avoid nutrient-rich or dirty water, which can smother it.
Light
Bright light is essential: 8 to 12 hours under grow lights or aquarium lighting, or full sun outdoors.
Feeding
Grown outdoors in tubs or ponds, the traps catch microorganisms naturally. Indoors, you may need to add infusoria, pond water, or live food cultures if growth slows.
Water temperature
Temperate species like U. inflata and U. macrorhiza prefer 50 to 75°F and can handle cool water, even brief freezing while dormant outdoors. Tropical species like U. gibba prefer 70 to 82°F and grow best in stable warm conditions.
Dormancy and turions
As days shorten and water cools, temperate species form small, compact winter buds called turions. These sink to the bottom and stay dormant through winter, then sprout again in spring. Don't throw out turions when cleaning a tank or pond; they are how the plant survives the winter.
Tropical species generally don't form turions and should be kept warm year-round.
FAQ
Do aquatic bladderworts need soil?
No. Aquatic species have no roots and float freely in the water, absorbing what they need directly from it and from the prey they catch.
Are bladderworts safe with fish?
They're safe with adult fish, but their traps can catch newly hatched fry. Keep them out of tanks where you're raising baby fish or shrimp.
What are turions?
Turions are tight winter buds that temperate bladderworts form as the water cools. They sink, sit dormant through winter, and sprout into new plants in spring.
Why is my bladderwort turning brown?
The usual causes are algae smothering the plant, water that's too rich in nutrients, or not enough light. Clean, soft water and bright light keep it green.