en magasin
La pépinière • Les plantes vivaces
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Il existe plusieurs types de plantes aquatiques suivant leur mode de végétation. Il y a les plantes de rive, qui ont leurs racines ancrées dans le sol. Elles supportent une immersion de 0 à 100 cm, suivant les espèces. Les plantes à feuilles flottantes ont leurs racines ancrées au fond de l’étang mais leurs feuilles flottent sur l’eau. Les plantes submergées ont tout leurs organes qui se développent sous l’eau. Elles peuvent être enracinées ou nager dans l’eau. Les plantes flottantes flottent à la surface de l’eau. Ces dernières ne sont pas rustiques sous notre climat.

La partie immergée des plantes aquatiques a une action oxygénante et/ou filtrante qui ralentira le développement des algues. Certaines plantes sont plus efficaces que d’autre pour éclaircir l’étang. Lorsque les plantes auront colonisé une bonne partie de la surface de l’eau, les algues diminueront également, car elles ont besoin de lumière et de chaleur pour se développer.

Lorsqu’on ne peut pas planter les plantes directement au fond de l’étang ou si l’on veut surveiller leur propagation, on peut les planter dans des paniers en plastique prévus à cet effet.
Exemples : Caltha palustris, Hippuris vulgaris, Nymphaea odorata ‘Alba’