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Vallisneria depth

i'm trying to help the folks at the brooklyn botanic garden re-do their deep 
pond with aquatic plants.  i was wondering how deep can vallisneria be 
planted and still thrive.  Vallisneria gigantea grows in my tanks like a weed 
and form these long ribbons on the surface.  this pond is almost 10 ft deep.  
how low can it be planted?  does anyone know?

tsuh yang chen, nyc, USA