Water Violet

About

Water violet is a European native - it grows wild in Lithuania, in ditches, marshes and standing water - and one of the very few stem plants in the hobby that is genuinely at home in cold water. Its pale light-green leaves are cut comb-fashion into flat segments almost to the midrib, but they sit alternately on the stem or in loose, more or less regular whorls, so leaf arrangement is not a safe way to identify it. The segment shape is what separates them: Hottonia's are flat combs, while the Limnophila and Myriophyllum it gets confused with carry thread-like ones. A settled stand is dense and feathery from substrate to tip and pushes fast vertical growth and side shoots in cool, bright water, with shoots up to 5 cm across. It has three specific failure modes. Shade the lower stems and they rot away while the tops still look fine - hobbyists call it 'the disappearing plant', and Aquasabi's instruction is that it must never be placed in shade at all. Hold it warm and growth stalls, stems thin and the stand melts: one keeper's plants took off within days of the tank dropping from 79 to 76 F, another was losing his with the tank no higher than 78 F. And it starves quietly in a lean tank - nitrate and phosphate have to stay measurable at all times, roughly above 5 and 0.5 mg/l, because nitrogen shortage stunts and yellows it while phosphate shortage darkens it as it wastes away. The pale shade itself is normal colour, not a deficiency. How warm is too warm is genuinely contested: Flowgrow says it also does well in tropical tanks as long as they stay under 26 C, Maidenhead Aquatics caps it at 20 C and treats it as a cool-water pond plant, and the hobbyist reports put the edge around 25-26 C - so plan for the low end and treat anything over 25 C as a gamble. The same disagreement runs through growth rate (Flowgrow, Aquasabi and Aquatic Arts say fast; Tropica and Maidenhead say medium) and difficulty, where Tropica alone calls it an easy beginner plant. Whether the sudden collapses hobbyists describe are heat stress or a leftover seasonal rhythm was asked on the forum and never settled; the winter resting buds (turions) are documented pond behaviour, and Flowgrow's under-26 C statement is the only basis for expecting year-round growth indoors. Aquarium sources give 10-30 cm, but the plant runs to 80 cm in the wild, so in a shallow tank expect to be topping it. In shops it is routinely mislabeled 'Hottonia inflata' - the true American featherfoil is a plant of eastern US swamps and ditches, not in cultivation, recognisable by thickly inflated flower stalks carrying much smaller flowers.

Care

Treat temperature as a hard gate rather than a preference: aim for 15-25 C and know that the sources disagree about the ceiling - Flowgrow allows a tropical tank under 26 C, Maidenhead Aquatics caps it at 20 C, and hobbyist die-offs start around 25-26 C. An unheated room-temperature tank suits it better than a heated tropical one. Give it strong light that reaches the base of the stems and never let anything shade it, or the lower sections rot and the plant vanishes from the bottom up. Keep nitrate and phosphate permanently measurable (above roughly 5 and 0.5 mg/l) instead of dosing lean - starvation is its third way of dying, not a fine-tuning detail. CO2 is not required, but Flowgrow and Aquasabi both recommend it for strong growth. Pinch out the tops and replant them to keep the stand bushy and let light reach every stem.

Frequently asked questions

What water parameters does a Water Violet need?

Water Violet does best at 4–26 °C (39.2–78.8 °F), pH 5–7.5 and a general hardness of 0–30 °dGH.

Where should Water Violet be placed in the aquarium?

Water Violet works best in the midground and reaches around 30 cm.

Is the Water Violet suitable for beginners?

Water Violet is a demanding species best attempted with some experience — it needs stable, closely watched conditions to thrive.

Sources

• Flowgrow Aquatic Plant Database — Hottonia palustris (Featherfoil)
• Aquasabi — Hottonia palustris
• Tropica — Hottonia palustris (plant 4443)
• Maidenhead Aquatics (fishkeeper.co.uk) — Hottonia palustris
• The Planted Tank Forum — 'Hottonia Palustris.. the disappearing plant'
• Aquatic Arts — Hottonia palustris tissue culture
• Practical Plants — Hottonia palustris (Water Violet)
• Wikipedia — Hottonia palustris
• Wikipedia — Hottonia inflata (American featherfoil)
• Griovenė — Vikipedija (lt)