About Elodea densa (Planch.) Casp.
Elodea densa (Planch.) Casp. is an aquatic plant that grows in water up to 4 meters (13 feet) deep. It has trailing stems that reach 2 meters (6.6 feet) or longer in length, and produces roots at intervals along its stems. Its leaves grow in whorls of four to eight, measure 1โ4 cm (0.39โ1.57 in) long and 2โ5 mm (0.079โ0.197 in) wide, and have a pointed tip. The stem system grows until it reaches the water surface, where it spreads out to form a thick, dense canopy that blocks light from reaching plants growing beneath it. This species is dioecious, meaning male and female flowers grow on separate individuals. Its flowers are 12โ20 mm (0.47โ0.79 in) in diameter and have three broad, rounded white petals. Petals on male flowers are 8โ10 mm (0.31โ0.39 in) long, while petals on female flowers are 6โ7 mm (0.24โ0.28 in) long. When grown in tropical environments, Elodea densa typically shows little variation in its growth pattern across the year. When grown in more temperate environments, the plant spends most of its winter energy producing and storing starch, and puts energy toward canopy growth during the summer. Elodea densa is a popular aquarium plant, but it is no longer sold in some regions due to its invasive potential. All cultivated plants of this species are a male clone that reproduces vegetatively. It grows well in cooler aquariums, is suitable for beginner aquarium keepers, and is easily propagated from cuttings. Reportedly, it secretes antibiotic substances that can help prevent the growth of blue-green algae. It grows best in nutrient-rich, high-light conditions, and has been observed outcompeting native species when introduced to new areas.
