Most common is Amaranthus retroflexus , known as redroot pigweed ... A single plant of redroot pigweed can produce 100,000 seeds. Young leaves can be eaten as a substitute for summer spinach.

Did you sow the seeds of these vegetables before? One of them could have grown into this new plant. It may also be the Amaranthus retroflexus, also known as Redroot Pigweed. This weedy species ...