Plant atlas

Geographical Origin and Habitat: This plant, also known commercially as Echinodorus 'peruensis', is native to South America, particularly the Amazonian regions of Peru and Bolivia. It inhabits shallow freshwater environments, marshes, flooded plains, and the shaded banks of rivers and canals. It is adapted to live both submerged and emersed, though in the aquarium hobby it is predominantly cultivated in its submerged form, where it best expresses the compactness of its foliage and its signature dark tones.

Taxonomy & Genetics: It belongs to the family Alismataceae. The name Echinodorus parviflorus has generated taxonomic debates in the past, and the label E. 'peruensis' is frequently used in the aquarium trade to distinguish this specific geographic variant, characterized by broader and darker leaves than the type form. With stable genetics, it is a pure botanical species adapted over millennia to the seasonal fluctuations of water levels in its native habitats.

Physical Structure: It develops a compact-upright rosette, which under submerged conditions generally reaches a height of 15-20 cm, making it one of the smallest and most manageable Amazon sword plants. The leaves are lanceolate, with short petioles that keep the rosette extremely dense and elegant. The roots are thick and whitish, capable of penetrating deeply into the substrate to absorb the nutrients necessary for the plant's sustenance.

Color & Texture: Submerged leaves are distinguished by a deep dark green color, which under optimal lighting and iron-rich fertilization can take on blackish or brownish-green hues, especially on the younger leaves. The leaf texture is leathery but flexible, with a matte surface and slightly recessed parallel longitudinal veins (3 to 5) that create a delicate striated texture to the touch and sight.

Lighting & CO2: Requires moderate to medium-high lighting. It does not need extreme light to grow, but good light intensity promotes a compact habit and intensifies the dark tones of the leaves. CO2 is highly recommended to promote steady, vigorous growth, but the plant is capable of adapting to low-tech setups without artificial injection.

Nutrition & Substrate: Being a plant with a strong root system, it benefits enormously from a rich and porous substrate. It is recommended to place fertilizer tabs rich in iron and trace elements directly under its roots every 3-4 months.

Water Chemistry: Prefers temperatures between 20°C and 28°C. It adapts to pH values from slightly acidic to neutral (6.0 - 7.5) and water hardness from soft to medium (KH 3-10 dKH). It is a robust plant that tolerates modest variations in parameters, as long as they are not sudden.

Space Management & Placement: Its natural placement is in the midground of the aquarium, where the dark green coloration creates an excellent chromatic contrast with light green or red plants. Thanks to its compact development, it can also be placed in medium or small aquariums (excluding nano tanks), placing it in spots where it receives sufficient light without being shaded by taller species.

Pruning: Pruning is simple and consists of removing the older or damaged leaves at the periphery of the rosette. The cut should be made near the base of the rhizome using appropriate aquascaping scissors. This operation stimulates leaf replacement from the center of the rosette and prevents the accumulation of organic debris at the base of the plant.

Risks & Diseases: The main risk is iron chlorosis, which manifests as yellowing and loss of texture in young leaves, easily resolved with root fertilizers. The thick, slow-growing leaves can be prone to brush algae (BBA) attacks in the presence of CO2 fluctuations or phosphate and nitrate imbalances in the water.