Limnobium laevigatum

Amazon Frogbit is a highly sought-after floating plant, valued by aquarists for its aesthetic appeal and significant utilitarian benefits in freshwater systems. Originating from the slow-moving waters of South America, it is exceptionally well-suited for the aquarium environment. Its primary biological function is its remarkable capacity for nutrient absorption. The plant exhibits an extremely fast growth rate, fueled by the uptake of nitrogenous compounds like nitrates and phosphates directly from the water column. This process serves as a powerful form of natural filtration, effectively reducing the bioload and out-competing algae for resources, thus helping to maintain clear water and a stable ecosystem.

The plant's structure consists of a rosette of smooth, rounded leaves that float on the surface, while a network of long, feathery roots hangs beneath. These roots are not only efficient at absorbing nutrients but also provide a dense, complex habitat perfect for harboring infusoria, which serves as a first food for newly hatched fish fry. Shrimp and timid fish species also utilize the root system for shelter and foraging. For optimal health, Amazon Frogbit requires adequate illumination, performing best under moderate to high lighting conditions, which stimulates more compact and vigorous growth. A key care requirement is maintaining low surface agitation. Strong water flow can submerge the leaves, leading to rot and decay. Therefore, placement away from filter outflows or the use of floating rings is recommended. While it is very adaptable to a wide range of water hardness and pH levels and does not need supplemental CO₂, its growth can be so prolific that it requires regular culling to prevent it from completely shading out submerged plants and impeding gas exchange at the water's surface.