State index
State regulation
A species can be a serious management problem without being legally regulated. These pages separate the legal classification from the management advice and show which rule was checked.
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NY
New York
Invasive plants in New York: 6 NYCRR Part 575 prohibits 69 plants and regulates six others, which may still be sold with a warning label.
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OH
Ohio
Invasive weeds in Ohio: one rule bans the sale and propagation of 63 plants, while a separate noxious weed rule requires management of a shorter list.
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PA
Pennsylvania
Invasive plants in Pennsylvania are listed in three noxious weed classes. Class B includes Japanese knotweed, tree of heaven and garlic mustard.
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VA
Virginia
Invasive plants in Virginia sit in three noxious weed tiers that restrict movement. A separate DCR list is advisory and has no regulatory authority.
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WI
Wisconsin
Garlic mustard in Wisconsin is Restricted under the state invasive species rule NR 40, which controls transport, transfer and introduction.
Related pages
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Invasive plants
Identification profiles for invasive plants.
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Look-alike comparisons
Side-by-side checks for commonly confused species.
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Removal and prevention guides
Cross-species method guides for identification, removal and prevention.