Hottonia palustris

Hottonia palustris, the Water Violet, is a native of temperate Europe and western Asia where it inhabits clear, still or slow-moving lakes, ditches, and bog pools with cool, soft, nutrient-poor water. In spring it sends up emergent flower spikes bearing pale lilac or white blossoms, one of the most beautiful aquatic flowering events in the temperate zone. Submerged, its stems carry whorls of finely divided, pinnate leaves that resemble feathers, creating a distinctive and elegant underwater appearance. The plant is a true cool-water species, thriving below 22°C and declining when temperatures climb into the tropical range. In the aquarium it is challenging due to its narrow temperature requirement and intolerance of hard, alkaline water. It is best suited to unheated or lightly cooled tanks designed as European temperate biotopes. When conditions are correct, it grows at a moderate rate and can be a spectacular specimen. Hottonia palustris is an advanced plant for dedicated hobbyists who value botanical authenticity and are willing to maintain precise cold-water conditions.