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Alternanthera reineckii "Lilacina"

Alternanthera reineckii "Lilacina"

Striking dark red plant with metallic lilac undersides. Needs intense lighting and stable CO2 to support its tall, robust stems and active photosynthesis.

Taxonomy
Class:Liliopsida
Order:Caryophyllales
Family:Amaranthaceae
Genus:Alternanthera
Species:Alternanthera reineckii "Lilacina"
Formerly known as: 

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Check out Alternanthera reineckii "Lilacina" on Atlarium

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Water Temperature

4 - 30 °C

pH Value

5 - 7

Water type

Freshwater

Light

Medium - High

CO2

Low - High

Expected height

60 cm

Expected width

18 cm

KH

0 - 14 dKH

Species description

Geographical Origin and Habitat: The species Alternanthera reineckii "Lilacina" is native to the swampy plains and along the riverbanks of South America, where it grows submersed or emersed in areas rich in organic sediments. In its natural environment, it is typically found in slow-flowing or stagnant waters, such as swamps, ponds, and tropical riverbanks, where it adapts beautifully to seasonal water level variations. This habitat provides a rich organic substrate and consistent, filtered light exposure. The plant's ability to grow both submersed and emersed is a testament to its extraordinary evolutionary resilience in these humid ecosystems.
Taxonomy & Genetics: From a taxonomic perspective, the plant belongs to the genus Alternanthera within the Amaranthaceae family. The 'Lilacina' variety is valued for its elongated leaves and deep, dark
Color & Texture: ation. This phylogenetic placement places it within a group of vascular plants highly specialized for aquatic life. Genetically, species in this genus exhibit high phenotypic plasticity, meaning their outward appearance can vary drastically based on available light and nutrient conditions. Selection and hybridization efforts have led to the development of specific cultivars suited for aquarium cultivation.
Physical Structure: The morphology of this plant is characterized by erect and robust stems that can grow up to 60 cm in height, with opposite, wide, lanceolate leaves featuring slightly wavy margins. This structural conformation allows the plant to withstand moderate water currents and maximize the absorption of carbon dioxide and light. The root system is designed to anchor the plant firmly to the soil and absorb mineral nutrients. In aquariums, the vertical or creeping development provides excellent natural barriers and shelter zones for small fish and invertebrates.
Color & Texture: Aesthetically, the plant offers a magnificent dark red or purplish coloration on the upper leaf surface and a brilliant, metallic lilac-violet hue on the underside. The leaf texture, soft yet resilient to the touch, adds visual depth and a sense of naturalness to any aquascaping composition. The chromatic variation serves as an excellent color contrast compared to traditional, all-green plants. Under strong lighting and targeted fertilization, the intensity of the color reaches its maximum visual splendor.

Care, breeding and tankmates

Lighting & CO2: For optimal growth, the plant requires intense lighting and stable CO2 injection to support growth, ensuring active photosynthesis and preventing basal leaf loss. Intense light promotes shorter internodes and the development of more saturated colors, while the CO2 supply ensures stable photosynthesis, preventing plant tissue decay. In the absence of these elements, the plant will tend to stretch excessively towards the light, losing its lower leaves and exhibiting weak, stunted growth.
Nutrition & Substrate: Nutrition must be managed by providing a rich, fertile substrate and column fertilization with iron, macro, and microelements to prevent decay or brittle stems. A fertile substrate or the use of root tabs near the root system significantly accelerates growth, while
Water Chemistry: This species prefers an acidic or neutral pH (5.0-7.0), KH up to 14, and tropical temperatures between 4 and 30 °C to promote biological stability. Regular water changes are recommended to maintain stable parameters and low levels of pollutants such as nitrates and phosphates. Good mechanical and biological filtration will ensure an environment free of suspended particles, which could settle on the leaves and limit photosynthesis.
Space Management & Placement: The ideal placement is the midground or background of the aquarium, ideal for creating color contrast with light green, fine-textured plants. As a plant that can expand laterally or vertically, it is important to carefully calculate distances from neighboring species to avoid mutual shading. Proper water circulation among the foliage also prevents the formation of stagnant zones susceptible to bacterial infections.
Pruning: Maintenance is carried out by regularly pruning the apical stems before they reach the water surface, replanting the cut tops to thicken the group. Periodically removing older or damaged leaves at the base stimulates the plant to focus energy on new growth. Using sterile, very sharp tools is essential to avoid crushing stem tissues, which could lead to necrosis or fungal infections.
Risks & Diseases: The main risks include susceptibility to green spot algae if phosphates are low, and rapid leaf melting if water parameters fluctuate too widely. Under conditions of poor water movement or nutrient imbalance, the leaves can be colonized by filamentous or green spot algae. In cases of severe stress, the stems can rot from the inside; if this occurs, damaged parts must be removed immediately to prevent infecting the entire plant.

Geographic Origin and Distribution

The species Alternanthera reineckii "Lilacina" is native to the swampy plains and along the riverbanks of South America, where it grows submersed or emersed in areas rich in organic sediments. In its natural environment, it is typically found in slow-flowing or stagnant waters, such as swamps, ponds, and tropical riverbanks, where it adapts beautifully to seasonal water level variations. This habitat provides a rich organic substrate and consistent, filtered light exposure. The plant's ability to grow both submersed and emersed is a testament to its extraordinary evolutionary resilience in these humid ecosystems.

Origin

Extra-Amazon South AmericaAmazon, Orinoco, and GuianasSelective breeding and cultivars

Plant profile

Placement
Midground
It is best positioned in the midground or foreground of the aquarium, depending on the tank size. Its compact nature allows it to create beautiful, dense bushes that do not overshadow other plants. When planted in groups, it forms a striking focal point that draws the eye. Ensure it is placed in an area that receives unobstructed light for optimal development.
Botanical form
Stem
This plant features sturdy, upright stems adorned with decussate leaves that exhibit a striking red to magenta hue on the underside. The leaves are typically lanceolate and somewhat smaller than the standard species, giving it a more compact appearance. Its structure is quite robust, allowing it to withstand moderate water flow. The dense foliage creates a beautifully textured visual element in the aquascape.
Growth
Medium
The growth rate is generally moderate when provided with optimal lighting and CO2 injection. Under lower light conditions, growth slows down significantly and the plant may struggle. Regular fertilization will encourage a steady and manageable upward progression. Overall, it requires less frequent maintenance compared to faster-growing stem plants.
Substrate
High
As a deeply rooting stem plant, this variety requires a fertile, nutrient-dense substrate like aqua soil to thrive. It utilizes its extensive root network to absorb essential macronutrients and iron directly from the bottom, which is crucial for maintaining its lilac-red hues. A substrate depth of 5 centimeters or more provides the necessary anchoring and nutritional reservoir for its optimal growth.
Column fertilization
Recommended
Liquid column fertilization is highly recommended to supply readily available nutrients to the leaves. A comprehensive liquid fertilizer containing both macro and micronutrients should be dosed regularly. Iron supplements are particularly beneficial to enhance the red pigmentation. Consistent dosing schedules help prevent deficiencies and promote vigorous foliage development.
Root fertilization
None
While it can absorb nutrients from the water column, it benefits significantly from a nutrient-rich substrate. Root tabs placed near the base can provide a steady supply of essential elements, promoting stronger root development. A fertile soil base encourages thicker stems and more robust overall growth. This dual feeding approach maximizes the plant's health and coloration.
Trimming
Occasional
Trimming should be done by cutting the stem just above a healthy node using sharp scissors. This encourages the plant to develop side shoots, resulting in a bushier appearance over time. The replanted tops will quickly root and form new plants, allowing for easy expansion. Regular pruning is necessary to maintain its compact shape and prevent lower leaves from being shaded out.
Propagation
Cuttings
Propagation is straightforward and is achieved primarily through stem cuttings. Simply cut a healthy top portion of the stem and plant it directly into the substrate. Ensure the cutting has at least a few leaves and a healthy node to promote rapid root growth. With optimal conditions, the new cuttings will establish themselves within a few days.
Sensitivity
Moderate
This species is somewhat sensitive to sudden fluctuations in water parameters, particularly pH and temperature. It does not tolerate prolonged periods of shading, which will cause it to quickly drop its lower leaves. Algae growth on its leaves can be a problem if nutrients and light are not properly balanced. Extreme care should be taken when using chemical treatments, as it can be delicate.
Layout role
accent, Midground, Background
It plays an excellent role as a colorful midground accent, adding depth and contrast to green aquatic landscapes. Its smaller leaf size makes it suitable for both large and small aquariums without overwhelming the layout. It pairs beautifully with light green foreground carpets or dark hardscape materials. Its striking coloration draws attention and serves as a natural focal point.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/30/2026