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Re: maximum depth for val.

On Mon, 31 Jan 2000, Tsuh Yang Chen wrote:

> 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

According to the data in Davis and Brinson, V. americana does not grow in
nature at depths greater than about 8 feet.  I suspect V. gigantea will be
the same.  I assume that light at depth is the limiting factor, so the
maximum depth should be reduced for light levels less than natural
incident light and for poor water clarity.

Roger Miller