Open Comment Period Following New Additions to the OIPC Invasive Plant List

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The Ohio Invasive Plant Council (OIPC) recently released information on the assessment of 9 new plant species for inclusion on their list of invasive plants. With this announcement also begins a 6-month public comment period for the new additions to the list.  Comments, suggestions or questions during this period should be directed to Theresa Culley (  


The OIPC is a coalition of agencies, organizations and individuals throughout Ohio concerned about the introduction, spread and control of invasive, non-native plants in Ohio's natural habitats. OIPC promotes public awareness of invasive species issues and encourages land management and research to detect invasive species and prevent new invasions into natural ecosystems.


The assessment protocol was developed by the OIPC, which in 2008 instituted a working group, composed of representatives across Ohio from academia, land management, the nursery industry, governmental agencies and the interested public, to use scientific data to revise the list of invasive plants for the state of Ohio.


An original list was created in 2000, spearheaded by the Ohio Division of Natural Areas and Preserves and based largely on input from land managers and others working in natural areas. Given the need to update the list over time and a desire to develop a rigorous and defendable process of identifying Ohio’s invasive plants, the OIPC made this endeavor a major priority. An updated list founded on a science-based process is particularly important to land managers, the nursery community, researchers and others in the Midwest evaluating invasive plants. 

In 2009, the working group first began developing an assessment protocol, based on careful review of the scientific literature, existing protocols from other states and organizations, and input from OIPC members with expertise in relevant areas, especially invasive species research, land management, and the nursery industry. Recognizing that some invasive plants have past and current horticultural importance, the OIPC working group has worked with the Ohio Nursery and Landscape Association (ONLA) to ensure that the protocol addresses nursery introductions, especially cultivated varieties or cultivars. The protocol is intended to provide fundamental and realistic determinations of invasiveness, aside from considerations of economic merit or the effectiveness of potential control measures. OIPC does not undertake to regulate the existence, production or introduction of specific non-native plants, leaving those activities instead to appropriate state agencies. 

Speaking of state agencies, the Ohio Department of Agriculture (ODA) in 2018 established new rules regarding the sale and distribution of invasive plants. This list consists of 38 plants that are regulated or will be regulated in the future.  A BYGL Alert was written on March 5, 2018 about the new rule and can be found at:


The information listed below was taken from the OIPC press release.


The OIPC Board and the Plant List Assessment Team is pleased to announce the release of assessments for 9 species for 2018!  All scores and associated worksheets are now available on the OIPC website at:  Listed species consist of:




Canada thistle (Cirsium arvense) - 63 points


Canadian Thistle Flower


Canadian Thistle Going To Seed


Poison hemlock (Conium maculatum) - 53 pts


Poison Hemlock Flower


Poison Hemlock


Wild parsnip (Pastinaca sativa) - 49 pts


Wild Parsnip Flower


Wild Parsnip


Wild Parsnip


Amur corktree (Phellodendron amurense) - 45 pts


 Amur Corktree


Amur Corktree



Common burdock (Arcticum minus) - 41 pts

Ravenna grass (Tripidium ravennae) - 36 pts




Star-of-Bethlemen (Ornithogalum umbellatum) - 28 pts

Goutweed (Aegopodium podagraria) - 20 pts

Golden raintree (Koelreuteria paniculate) - 18 pts


 Golden Raintree


Golden Raintree


Golden Raintree


It is always important to stay up-to-date and involved with what is happening in the industry. One way to do that is to begin reporting invasive species that you are seeing when you are out in the field using the Great Lakes Early Detection Network (GLEDN) App. There have been several BYGL Alerts written about the App and how you can help monitor and report invasive species. Check out this past BYGL Alert for more information: