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.