Alternanthera reineckii "Kleines Papageienblatt"

Geographical Origin and Habitat: Alternanthera reineckii "Kleines Papageienblatt" (German for "Little Parrot Leaf") is a dwarf cultivar selected in Europe from strains native to subtropical South America, particularly along the Paraná River basin in Brazil and Paraguay. In its native habitats, the species grows in dense, low colonies on muddy and marshy soils exposed to the sun, adapting to months of partial or total submersion. The selection of this specific dwarf variety emphasized the plant's tendency to remain compact and creeping on the substrate.

Taxonomy & Genetics: Taxonomically, it belongs to the Amaranthaceae family, genus Alternanthera. This cultivar is genetically related to the widespread 'Mini' variety, sharing the mutation that causes extremely short internodes and compact growth. The genetic expression of this plant is highly responsive to lighting conditions: under intense light and stable nutrients, the plant maximizes anthocyanin synthesis, showing uniform red

Color & Texture: ation and inhibiting vertical stem elongation.

Physical Structure: It features an erect but very compact stem structure, with a height in the aquarium that rarely exceeds 20-30 cm and a single stem width of about 4 cm. The leaves are arranged in opposite, decussate pairs, very close to each other due to the short internodes. The leaf blade has a lanceolate-ovate shape, smaller than other cultivars of the same species, with a slightly wavy surface that catches light from different angles.

Color & Texture: The foliage has a spectacular coloration ranging from ruby red to brilliant carmine pink. The upper side of the leaf can show bronze-olive shades under moderate light but assumes a uniform bright red under intense light, while the underside consistently shines with a very bright fuchsia pink. The leaf texture is soft and delicate, with thin but visible main veins standing out on the leaf surface.

Lighting & CO2: It requires medium to high lighting (at least 30-40 lumens/liter or good quality LEDs) to maintain its compact growth and prevent internodes from stretching in search of light. Stable CO2 injection at levels of 15-25 mg/L is strongly recommended to support growth, preventing lower leaf loss and ensuring the development of healthy new leaves.

Nutrition & Substrate: A fertile substrate rich in clay and iron, such as active aquasoil, is ideal to support its dense root system. Liquid column fertilization must be regular and complete, focused on the constant supply of chelated iron and potassium to prevent chlorosis and necrosis of older leaves.

Water Chemistry: Tolerant of water chemistry: it withstands temperatures from 4°C to 30°C, preferring a range between 22°C and 26°C. It adapts to acidic or neutral pH (5.0-7.0) and carbonate hardness between 0 and 14 dKH. Keeping the water clean with regular changes promotes overall plant health.

Space Management & Placement: Due to its compact height, it is perfect for the foreground or midground of small aquariums (nano tanks). It should be planted in dense groups, spacing individual stems 1-2 cm apart to create a dense, uniform red cushion without shading each other.

Pruning: Pruning is done by trimming the upper tips with sharp scissors. The cut tips can be replanted directly into the substrate to propagate the plant, while the remaining stem will quickly develop two or more lateral shoots, helping to further densify the cushion.

Risks & Diseases: If light is insufficient, the plant tends to stretch, losing its lower leaves and fading. It is susceptible to thread algae or green spot algae if macro-nutrients in the water column are not balanced. Tender leaves are welcomed by pest snails and herbivorous fish if not fed correctly.