Potamogeton crispus (Curled pondweed) is a very attractive oxygenator with bronze ruffled leaves and used to grow in profusion in my area, but seems to have mysteriously disappeared almost everywhere. I now have to rely on sporadic supplies from elsewhere so availability is patchy. It does not store or travel well and will not be sent in warmer weather; I have thrown away a lot more than I have ever sold. It prefers cooler, preferably moving, water. Available in small numbers only.
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