Hey Harry - Vallisneria is a true aquatic and doesn't have an emersed form. It'd just flop over and crisp up. If you wanted a grassy look though, there are several other species that'd work. Sagittaria, Lilaeopsis, Haigrass, Echinodorus tenellus, those will all grow emersed. Swords also have a nice emersed form, they could stand on their own.
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