On Sun, 23 Apr 2006 15:28:45 -0400, CanadianCowboy©
wrote:

Can these tropical plants such as water lettuce, hyacinth, etc be
brought inside

Yes, though, imo, they're more work than worth the savings. Put about half
the root in dirt (or contact with dirt), as they can't get enough food out
of water alone inside (I assume) with enough water to still float. You must
debug them before they come in, and again about 3 months later. Very bright
light, plus being next to a window and getting real sun, seems to do it.
~ jan

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(Do you know where your water quality is?)