Question

what are and undesirable plants

Answer 1

Weeds are plants that grow where they are not wanted. With the exception of certain plants such as poison ivy, ragweed and invasive exotic plants like Japanese knotweed and giant hogweed, these plants are not “bad” in themselves.

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Answer 2

A weed is a plant consideredundesirable in a particular situation, "aplant in the wrong place". Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks.