Elodea densa, also called Brazilian waterweed, is a fully submerged aquatic plant native to South America and widely kept in aquariums and ponds. It grows easily in cool water with good light, but it can spread aggressively and should never be released into the wild.
Family
Hydrocharitaceae (Hydrocharit family)
Light
Shade
Water
Keep fully submerged in water; no watering needed.
Soil
Grows rooted in nutrient-rich aquarium gravel or pond sediment, or floats loose.
Temperature
Cool to moderate water temperatures, roughly 10–25 °C; does well in cooler tanks.
How easy
Easy
Safety
Not known to be toxic
About
Elodea densa, the large-flowered waterweed or Brazilian waterweed, is a species of Elodea native to warm temperate South America in southeastern Brazil, Argentina, Chile, and Uruguay. It is considered a problematic invasive species due to its use in home aquariums and subsequent release into non-native ecosystems.
How to grow it
Elodea densa is a popular aquarium plant, but is no longer sold in some areas due to its invasive potential. Plants in cultivation are all a male clone, reproducing vegetatively.
It grows well in the cooler aquarium and is suitable for the beginner. It is easily propagated by cuttings. According to reports it secretes antibiotic substances which can help prevent blue-green algae. It grows best in a nutrient-rich, high light environment, but has shown an ability to outcompete other species when it is introduced.
Text excerpted from the Wikipedia article Elodea densa by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.