That is my concern. The grasses are in pots only a few inches deep in
the water. The ice will surely be that thick or more. Hence, my
thought about sinking them in the deep part that will not be frozen.

These are all 5B hardy. John

Then sinking them should work. ~ jan
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Also ponding troll free at:
http://groups.google.com/group/The-Freshwater-Aquarium