Just put the pond to bed for the winter today - cleaned out the old
plants, shut down the waterfall, etc. I had a ton of water lettuce
that came from a single plant I bought this spring. I am in Zone 6,
and the top of the pond does freeze over for a few weeks in the
winter, so I doubt that the water lettuce would survive. Just for
kicks, I put one of the smaller ones in a glass bowl and brought it
inside to see what it does. Has anyone ever tried wintering over this
plant?