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About 3 years ago I planted a Thalia Dealbata in the small lake that is bordering the back of my garden in the Netherlands. As I suspected it not to be hardy, I took it inside during winter of the first year, where it barely survived. After the Water Garden forum adviced me that the plant is reasoble hardy, I left it outside in the water next year and it survived perfectly. It now is a splendid large plant with nice purple ears, far too large to get inside again. As I understood the plant will survive as long as the roots which are about 30 cm below water level, will not freeze. Our Dutch winters are very mild the last few years, but a cold winter could come again. I would really regret to loose this plant, so I would like to know what to do if a winter with severe frost would come again. Does anyone has experience in protecting the roots of Thaia Dealbata (or other waterplants) from freezing?
Louis Harmsen
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