Echinodorus “Rubin”

Scientific name: Echinodorus “Rubin”

Family: Alismataceae

Usual maximum size in aquariums: 30 - 50 cm (11.81 - 19.69 inch)

014

Recommended pH range for the species: 6.5 - 7.5

Recommended water hardness (dGH): 4 - 18°N (71.43 - 321.43ppm)

0°C 32°F30°C 86°F

Recommended temperature: 17 - 27 °C (62.6 - 80.6°F)

Reproduction of the plant: Runners

Origin (in the wild): Cultivated form / Hybrid

How fast these plants grow: Normal

Recommended substrate: Fine gravel

Demands on lighting: Bright

Ideal placement in a fish tank: Middle

Common Name

Rubin Sword

Origin

Echinodorus “Rubin” is a cultivated hybrid, created by crossing Echinodorus horemanii ‘Red’ with Echinodorus ‘Barthii’. As a result, it does not occur in the wild. It was specifically developed for use in aquariums, where it is valued for its decorative red foliage and resilience.

Growing Conditions

This plant thrives in fully submerged conditions and can also grow emersed in high-humidity environments such as paludariums or commercial nurseries. When grown submerged in aquariums, it produces broad, reddish to wine-colored leaves that make it a standout midground feature.

Echinodorus “Rubin” prefers bright lighting and a nutrient-rich substrate. Although a CO₂ system is not essential, it significantly enhances growth and intensifies the red coloration of the leaves. The plant grows best in water temperatures between 17 - 27 °C (62.6 - 80.6°F), with a pH of 6.5 to 7.5 and hardness levels ranging from 4 - 18 dGH.

Planting Area

With a height of 30 - 50 cm (11.81 - 19.69 inches), Echinodorus “Rubin” is best suited for the midground of large aquariums or as a focal point in medium-sized tanks. When planted in groups, it creates a stunning contrast against green foliage. Leave enough space for the rosette to expand outward.

Propagation

Echinodorus “Rubin” reproduces through runners that emerge from the base of the mother plant. These runners produce adventitious plantlets, which can be left attached until they develop roots. Once rooted, the young plants can be separated and replanted. Propagation is easy under proper care, and the plant may also flower in emersed conditions, although seed propagation is rarely used in home aquaria.

Difficulty

This plant is of medium difficulty to grow. While it is relatively undemanding, it requires adequate space, bright light, and regular nutrient supplementation to maintain its vivid coloration. Occasional trimming of older leaves and the addition of iron-based fertilizers will help maintain its health and visual appeal.

Short Description

Echinodorus “Rubin”, commonly known as Rubin Sword, is a popular aquarium hybrid prized for its vibrant red leaves and elegant rosette shape. It grows well in submerged conditions, requires bright light, and benefits from a nutrient-rich substrate and CO₂ supplementation. Suitable for midground placement, it can serve as a stunning centerpiece or be grouped with other sword plants for a bold aquascape. With the right care, this cultivar is both hardy and visually rewarding.

Frequently Asked Questions

• Why are the leaves of my Echinodorus “Rubin” turning green instead of red?
  This usually indicates insufficient lighting or lack of nutrients, especially iron. Increase light intensity and consider adding an iron-rich fertilizer to enhance the plant's red coloration.
• Does Echinodorus “Rubin” require CO₂ injection?
  While it can grow without CO₂ supplementation, using CO₂ significantly improves growth speed and intensifies coloration. It's highly recommended in high-tech setups.
• Can this plant be grown in low-light aquariums?
  Echinodorus “Rubin” will survive in low light, but the red coloration will fade and growth will be slower. For best visual results, provide bright lighting.
• How often should I trim Echinodorus “Rubin”?
  Trim only when older leaves begin to yellow or when the plant outgrows its space. Unlike fast-growing stem plants, swords grow slower and don’t require frequent pruning.
• Is Echinodorus “Rubin” suitable for small tanks?
  It’s better suited for medium to large tanks. In smaller aquariums, it may outgrow the space quickly and overshadow other plants.
• How do I propagate Echinodorus “Rubin”?
  This plant propagates through runners that develop small plantlets. Wait until the plantlets form roots, then cut and replant them in nutrient-rich substrate.