Myriophyllum sp. ‘Roraima’ Plant Care Guide

Additional Information

Myriophyllum sp. ‘Roraima’ is a stem plant from the Haloragaceae family with a highly distinctive visual character, featuring fine, feathery leaves and coloration ranging from reddish-brown to orange-red under optimal conditions. The stems are reddish with active branching, forming a bushy structure when trimmed regularly.

In aquascaping, this species is commonly used as a red accent plant in the midground to background, particularly in Dutch-style layouts or designs emphasizing strong color contrast. Its dense foliage and rapid growth make it effective for filling space while providing visual contrast against predominantly green plants.

In its natural habitat, this plant originates from tropical South America, specifically the Roraima region of Brazil. Its adaptability to a wide range of water parameters makes it relatively flexible, although optimal performance is achieved under stable and controlled conditions.

Requirements and Care

Growth Characteristics

This plant exhibits vertical growth with a strong tendency for active branching. Internodes remain relatively compact under high light conditions, resulting in a dense and compact appearance. Without trimming, stems can extend beyond 50 cm, with clump widths reaching approximately 5 cm.

Growth is very rapid, making regular trimming an essential part of maintenance. Pruning stimulates lateral branching, producing a fuller and more aesthetically pleasing structure.

Lighting

Myriophyllum sp. ‘Roraima’ falls within the medium to high light category, requiring approximately 70–150 µmol m⁻² s⁻¹ PAR.

Under low to medium light conditions:

• Color tends to shift toward greenish-brown
• Internodes elongate
• Plant structure becomes looser

Under high light conditions:

• Red to orange coloration becomes more intense
• Branching activity increases
• Leaf density improves significantly

Consistent light distribution is important to maintain stable coloration and structure.

CO₂ and Carbon

This plant is adaptable and can grow in non-CO₂ systems, making it suitable for low-tech setups. However, without CO₂ injection:

• Growth rate decreases
• Red coloration is less pronounced
• Structure becomes less compact

In systems with CO₂ (±20–30 mg/L):

• Growth becomes highly vigorous
• Color appears deeper and more contrasted
• Response to trimming improves significantly

In aquascaping practice, CO₂ supplementation is strongly recommended to achieve optimal visual performance.

Nutrients

As a very fast-growing species, Myriophyllum sp. ‘Roraima’ has relatively high nutrient demands, primarily from the water column.

Relevant nutrient parameters include:

• Nitrate (NO₃⁻): 10–50 ppm
• Phosphate (PO₄³⁻): 0.1–3 ppm
• Potassium (K⁺): 5–30 ppm
• Iron (Fe): 0.01–0.5 ppm

Nutrient deficiencies, particularly in nitrogen and iron, are quickly reflected in color loss and leaf deformation. Stability and consistent availability of nutrients are key factors in maintaining healthy growth.

Water Parameters

This plant tolerates a relatively wide range of water parameters:

• pH: 5.0–7.5
• Temperature: 15–25°C (tolerates up to 28°C)
• GH: 3–12 dGH
• KH: 2–14 dKH

Despite this tolerance, stability is far more important than absolute values. Extreme fluctuations can negatively affect leaf structure and growth rate.

Substrate

As a stem plant, Myriophyllum sp. ‘Roraima’ does not rely heavily on substrate nutrients, as most uptake occurs through the water column.

However, substrate still plays a role in:

• Maintaining planting stability
• Supporting initial root development
• Providing supplemental nutrient reserves

Both inert and active substrates can be used, as long as water column nutrients are adequately maintained.

Propagation

Propagation is carried out through stem cuttings:

• Cut the top or mid-section of the stem
• Replant directly into the substrate
• Roots will develop quickly

This method is highly efficient due to the plant’s strong regenerative capacity. Routine trimming also serves as a natural propagation method in aquascaping.

Conclusion

Myriophyllum sp. ‘Roraima’ is a fast-growing stem plant with strong potential for red coloration under high lighting conditions. It is flexible enough to be used in both low-tech and high-tech systems, although optimal performance is clearly achieved with a combination of strong lighting, CO₂ supplementation, and stable nutrient supply.

In aquascape layouts, this plant functions as a dynamic background element and a contrasting color accent. With proper maintenance, particularly regular trimming, it can develop into a dense and visually appealing structure over time.