Oxygenating Pond Plant (Lower Walkley S6)

Hello, this pond plant needs trimming back a bit so if you would like some for.your pond your very welcome. I cant remember what its called. I remember it was labelled as an oxygentating pond plant. It seems pretty hardy and and grows well. Warning there is duck weed in my pond so whilst ill try my best to wash it off if you dont want duck weed you might be better off stearing clear.