Common Waterweed: Egeria densa
A super-fast growing, oxygenating stem plant that is famous for its hardiness and ability to outcompete algae.

Common Waterweed
Egeria densa, commonly known as Common Waterweed, is a robust and versatile aquatic plant cherished for its lush green foliage and ability to thrive in a variety of freshwater environments. This perennial species is characterized by its slender, elongated stems and whorls of emerald-green leaves, which can grow up to 3 feet in length. Egeria densa plays a critical role in aquascaping, offering aesthetic appeal while promoting water quality and providing habitat for aquatic life.
Care Guide
To ensure optimal growth of Egeria densa, the following maintenance practices are essential:
- Lighting: Moderate to high lighting conditions are preferred. A duration of 10-12 hours of light per day will foster ideal growth.
- Temperature: Maintain water temperatures between 18-24°C (64-75°F) for optimum health.
- Water Flow: Moderate water movement mimics its natural habitat, promoting vigorous growth and preventing the growth of algae.
- Pruning: Regular trimming is recommended to remove excess growth and maintain the plant's form. This encourages bushier growth and helps prevent it from overtaking the aquarium.
Nutrient Requirements
Light
Egeria densa thrives under moderate to high light conditions. It benefits from full-spectrum lighting, which promotes healthy photosynthesis and leaf development.
CO2
While Egeria densa can adapt to lower CO2 levels, the introduction of CO2 injection can significantly enhance growth rates, leading to denser foliage and a healthier tank environment.
Fertilization
Regular fertilization is crucial for the health of Egeria densa. Use a balanced liquid fertilizer, particularly one high in potassium and micronutrients, to support robust growth and healthy coloration.
Natural Biomes
Egeria densa is native to various aquatic systems, often found in biodiverse biomes such as:
These biomes provide rich, organic environments where Egeria densa flourishes, contributing to the overall health of the aquatic ecosystem.
Livestock Compatibility
Common Waterweed is compatible with a wide range of freshwater fish and invertebrates. Species that thrive alongside Egeria densa include:
- Small to medium-sized fish: Tetras, Guppies, and Rasboras benefit from the cover and protection it offers.
- Shrimp: Neocaridina and Caridina species will find refuge among the dense foliage, making it an excellent choice for shrimp tanks.
In conclusion, Egeria densa is a valuable addition to any aquascape, providing both beauty and function, while facilitating a healthy underwater habitat.