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A: Pesticide producers often useful plants “invasive” when they interfere with their mono-crops (i.e. a single crop grown on the same land year after year). Thus, we use the terms “expansive” and “persistent”.
A plant is considered “persistent” if their seeds multiply despite the death of its parent plant. Examples include: purple loostrife, norway maple, tree of heaven, garlic mustard, scentless chamomile, and privet.
A plant is considered “expansive” if bits of the plant’s roots can produce their own full plants. Examples include: paper lantern, coltsfoot, kudzu, Japanese knotweed, creeping jenny, and Bishops goutweed.
As a final note, we DO accept the following “invasive” plants because of their high food value: comfrey, sunchoke, raspberries, and stachys