It seems that wild rice is considered the only grain that is indigenous to North America. Other grains like Amaranth and Quinoa are said to come from South America, but now this about Wild Rice.
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It's also one of the grains very high in Lysine, which puts it on the radar as a Super Grain for us and something we can grow since it already grows wild here.
The Native Americans paddled canoes through lakes growing wild rice and tapped the heads, letting the grain fall into the canoe. You can learn how to cook this ancient grain yourself.