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I thought this was a red beet, but I am not so sure, as it got huge very quickly. It has red veins all over it.
This looks like Amaranth. It's also called 'Pigweed' and this plant is tremendous for nutrition. Amaranth is a very cool plant. It is called a Wonder Food known by even our ancestors.
This is an Amaranth.
This looks like your Amaranth plant.
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