Giant Vallis: Vallisneria americana var. gigantea
The largest of the Vallisneria species, with wide, belt-like leaves that can reach several feet in length, ideal for tall aquariums.

Giant Vallis
Giant Vallis, scientifically known as Vallisneria americana var. gigantea, is a striking aquatic plant renowned for its long, ribbon-like leaves that can grow upwards of 3-6 feet in length. This robust species provides a lush backdrop in aquascapes, contributing to both aesthetics and functionality. Its vibrant green foliage creates a natural feel, while its ability to thrive in various conditions makes it a favorite among aquarists. Ideal for larger aquariums, Giant Vallis serves as an excellent habitat for aquatic livestock, as well as a means of oxygenation and water quality improvement.
Care Guide
To ensure optimal growth of Giant Vallis, the following care guidelines should be adhered to:
- Lighting: Moderate to bright lighting is recommended for healthy growth. A photoperiod of about 10-12 hours is ideal to stimulate photosynthesis without causing algae problems.
- Temperature: Maintain a water temperature between 68°F to 82°F (20°C to 28°C).
- Water Parameters: This plant prefers slightly alkaline to neutral pH levels (6.5 to 8.0) and a hardness of 5 to 20 dGH.
- Pruning: Regular pruning helps to manage growth and remove any dead or damaged leaves. Trim back overgrown areas to encourage new growth.
Nutrient Requirements
- CO2: While Giant Vallis can adapt to lower CO2 levels, injecting CO2 can significantly enhance its growth and vigor, especially in high-tech aquariums.
- Fertilization: A balanced aquatic plant fertilizer can be applied, emphasizing macro and micronutrients. Root tabs can supplement nutrients directly at the plant's base, supporting robust development.
Natural Biomes
Giant Vallis is predominantly found in the following biomes, where it thrives in natural habitats:
These native habitats are characterized by slow-moving waters and rich sediment, providing insights into the optimal conditions for cultivation in aquariums.
Livestock Compatibility
Giant Vallis provides an ideal environment for various fish and shrimp species. Compatible inhabitants include:
- Fish: Peaceful community fish like Tetras, Apistogramma, and Gouramis thrive in environments enriched with Giant Vallis. The plant offers hiding spots and encourages natural behaviors.
- Shrimp: Neocaridina and Caridina species, such as Cherry Shrimp and Amano Shrimp, flourish among the foliage, benefiting from cover that reduces stress and promotes breeding.
With its grandeur and ecological benefits, Giant Vallis serves as a fundamental component of any well-designed aquascape.