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Egeria densa

Identity

Common name: Brazilian waterweed
Synonyms: Elodea densa, Anacharis densa
Origin: South-America
Plant type: Herbaceous
Life cycle: Perennial
Code of conduct: Annex I (consensus list)
Invasive status (ISEIA protocol): Black list
Main ornemental function: Plants for ponds

Description

Egeria densa is a submerged, freshwater perennial. Stems are erect and grow until they reach the water surface where they form dense mats. Stems can reach a length between 3 and 5 m. Stem and leaves are bright green, leaves are found in whirls of 4 to 8.

Spread

Egeria densa is a popular aquarium plant. High vegetative growth rate. No sexual reproduction. Stem fragments float away, root and regenerate new plants.

Habitat

The Brazilian waterweed grows in various freshwater habitats, from still to flowing systems and from very shallow to deep waters. It is common in acid waters but lives also in calcareous and eutrophic environments. The species is not light demanding.

Impact

Species classified A1 in Belgium. Potentially invasive in France. Brazilian waterweed forms dense monospecific populations which often colonise the whole water bodies, preventing water from flowing, cutting off light, producing anoxic conditions and trapping sediments. It outcompetes native aquatic plants and adversely affect fish communities. The plants are not consumed by fishes and they interfere with navigation and recreation activities. For more information about this species, click here

Recommendation

Do not buy nor plant this species.

Possible native alternative

Main ornemental function

Plants for ponds

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