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Water Wisteria
Hygrophila difformis
Care level: Easy
Native to wetlands across South Asia, Water Wisteria is famous for its dramatic leaf dimorphism: emersed (above-water) leaves are broad and simple, while fully submerged leaves become deeply lacy and fern-like as the plant adapts to life underwater. This fast, easy growth makes it a popular nutrient sponge that helps outcompete algae in newly set-up tanks.
Moderate to high aquarium lighting (~30-50 PAR) gives the most compact, lacy growth; lower light produces leggier stems with wider leaf spacing.
Water
Weekly 20-30% water changes; adaptable, pH 6.5-7.5, 22-28°C, soft to moderately hard water.
CO2 & Feeding
Grows without CO2 injection but responds with denser, faster growth under supplementation; a heavy nutrient user that benefits from regular liquid fertilizing.
Substrate
Any standard planted substrate works; roots relatively shallow, so nutrient-rich soil or root tabs help but are not strictly required.
Temperature
22-28°C.
Growth speed
Fast
Tank Placement
Midground
Did you know?
A single stem cutting dropped into the substrate, or even left floating, will root and grow on its own, new leaves that form underwater will look completely different in shape from the emersed leaves the plant arrived with.
Care by Season
Spring
Fast growth resumes; take stem cuttings to replant and thicken the background.
Summer
Very fast growth in warm, bright conditions, trim weekly to prevent it from shading out other plants.
Autumn
Growth slows; reduce fertilizing slightly and remove any leggy, bare-stemmed lower sections.
Winter
Tolerates cooler water but growth slows considerably; trim less often as the plant rests.
Growing & Maintenance
Planting
Plant the stems in any standard substrate in the midground, or leave them floating.
Fertilising
A heavy nutrient user. Dose liquid fertiliser regularly, and add root tabs if you can.
Trimming
Trim weekly in peak growth, so that it does not shade out other plants.
Propagation
From stem cuttings, which root in the substrate or even while floating.
Pests & Diseases
Common problems
Leggy, bare lower stems
Most likely cause: Too little light.
What to do: Cut the stem near the substrate, replant the healthy top and give it more light.
Yellowing leaves
Most likely cause: Nutrient deficiency.
What to do: Increase the liquid fertiliser dose.
Leaves changing shape after planting
Most likely cause: Normal. Leaves grown above water in the nursery are broad, and new underwater leaves are finely divided.
What to do: Nothing to do.
Other plants shaded out
Most likely cause: Very fast growth in warm, bright tanks.
What to do: Trim it every week.
Slow growth
Most likely cause: Cool water.
What to do: Keep the water at 22-28°C and trim less often.
Pests & Diseases
Leggy, bare-stemmed growth
Signs: Lower stem loses leaves, growth concentrated only near the top
Treatment: Cut the stem near the substrate and replant the healthy top portion; increase light to prevent recurrence.
Nutrient deficiency (yellowing)
Signs: New leaves pale or stunted despite good light
Treatment: Increase liquid fertilizer dosing, particularly nitrogen and potassium, since it is a fast, heavy-feeding stem plant.
FAQ
Why did my Water Wisteria's leaves change shape after planting?
This is normal leaf dimorphism, leaves grown emersed in a nursery are broad and simple, while new growth underwater becomes finely divided and lacy as the plant adapts to submersion.
Can Water Wisteria be grown floating instead of planted?
Yes, it grows well either rooted in substrate or left to float, drawing nutrients directly from the water column, though rooted plants tend to grow bushier.
Does Water Wisteria need CO2?
No. It grows without injected CO2, but responds to it with denser, faster growth.
How much light does Water Wisteria need?
Moderate to high light for compact, lacy growth. Lower light gives leggy stems.
What water does Water Wisteria need?
It is adaptable: pH 6.5-7.5, 22-28°C, soft to moderately hard water. Change 20-30% of the water every week.
How do I propagate Water Wisteria?
From stem cuttings. A single cutting pushed into the substrate, or even left floating, roots and grows on.
