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Pennsylvania & Federal Noxious Weeds

A noxious weed is a plant species that has been designated by a country, state, or national agricultural authority as one that is injurious to agricultural and/or horticultural crops, natural habitats and/or ecosystems, and/or humans or livestock.

Common: Species found in at least 1/3 of Pennsylvania counties. (This does not include cultivated species.)

Uncommon: Species found in Pennsylvania, but not widespread (i.e., found in less than 1/3 of Pennsylvania counties.)

Not present: Species not yet found in Pennsylvania.

*Status column last updated in August 2016.

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