Yes they are very invasive noxious weed, but they are well-loved by our aquatic pets and that's the Limnophila. They are common plants when it comes to aquariums and they do well with little specialized care, also making excellent cover for fishes. Both underwater and air grown leaves are arranged in whorls, and they're herbaceous in either lance shaped or feather like. It also blooms with tubular flowers and it differs depending on species, with some occurring in the leaf axils and others supported on an inflorescence.

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Source: Gardening Know How