Answer: Although 21 inches is a bit shallow, in my experience hardy pond plants survive better plunged to the deepest part of the pond. When kept indoor they tend to rot in storage. In fact, your goldfish could also probably survive providing the water does not freeze all the way to the bottom. To prevent such a a solid freeze, some gardeners run a recirculating pump and a deicer all winter for their fish. Good luck with your plants!
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