This information was compiled in January and February of 2018. If a state or province is not listed, there is no official legislation or warning against Iris pseudacorus from that government. The web links and legal status will change over time. To get the latest information for a specific location you should do a Google search using key words like: 'Iris pseudacorus Alberta prohibited' or 'Iris pseudacorus Alberta invasive list' or 'Iris pseudacorus Alberta banned'. Most states and provinces also have a list of regulated and banned invasive species which you could Google search.
| Location | Status | Notes & Evidence |
| Alaska | discouraged | Not illegal, but scores 66/100 threat level for invasivness in the southern coastal region. http://accs.uaa.alaska.edu/files/invasive-species/Iris_pseudacorus_BIO_IRPS.pdf |
| Alberta | prohibited | "Do not grow or purchase this plant." http://canadainvasives.ca/initiatives/national-horticulture-outreach-network/canadas-top-10-most-important-invasive-horticultural-plants/ |
| British Columbia | prohibited | Prohibited, listed as a provincially regulated noxious plant. http://bcinvasives.ca/invasive-species/about/regulated-invasive-species-in-bc/list-of-regulated-invasive-plants-in-bc/ |
| California | discouraged | A bad weed in wetlands in California. Deserves a “B” rating as it has invaded many areas to which it is adapted and undoubtedly has the ability to spread further. Because of this potential future harm, a “B” rating is justified. http://blogs.cdfa.ca.gov/Section3162/?p=3591 |
| Colorado | discouraged | Not illegal, but on the offical watch list as potentially invasive species. https://www.colorado.gov/pacific/agconservation/noxious-weed-species |
| Connecticut | prohibited | No person shall import, move, sell, purchase, transplant, cultivate or distribute it. https://www.cga.ct.gov/2004/act/Pa/2004PA-00203-R00SB-00547-PA.htm |
| Delaware | discouraged | Not illegal, but one of the top invasive species in the state. http://www.dnrec.delaware.gov/fw/NHESP/Documents/Non-native%20and%20Invasive%20Plants%20of%20Delaware%202016.pdf |
| Florida | discouraged | Not illegal, but officially discouraged from cultivation. http://plants.ifas.ufl.edu/plant-directory/iris-pseudacorus/ |
| Idaho | discouraged | Recognized as a noxious weed and is on state's containment plan list. http://invasivespecies.idaho.gov/terrestrial-plants |
| Illinois | prohibited | Designated as an injurious invasive species, it is now illegal to buy, sell, or transport this species in Indiana and Illinois. http://www.iiseagrant.org/ais/aqpl_trade.php |
| Indiana | prohibited | Designated as an injurious invasive species, it is now illegal to buy, sell, or transport this species in Indiana and Illinois. http://www.iiseagrant.org/ais/aqpl_trade.php |
| Kansas | discouraged | Not illegal, but being considered for addition to the watch list as potentially invasive species. https://agriculture.ks.gov/docs/default-source/pp-weed-reports-2017/noxious-and-invasive-weed-update---spring-2017.pdf?sfvrsn=0 |
| Kentucky | discouraged | Not illegal, but officially discouraged from cultivation. https://efotg.sc.egov.usda.gov/references/public/KY/Invasive_Advisory_List.pdf |
| Louisiana | discouraged | Not illegal, but officially urges the use of native Louisiana Iris species instead. http://www.wlf.louisiana.gov/sites/default/files/pdf/page_wildlife/32937-Wildlife%20Action%20Plan/18_chapter_6.pdf |
| Maine | prohibited | Prohibited since January 2017, illegal to sell, import, export, buy or intentionally propagate. http://www.maine.gov/dacf/php/horticulture/documents/InvasivePlantListHandout.pdf |
| Manitoba | discouraged | Not illegal, but officially discouraged from cultivation. http://canadainvasives.ca/initiatives/national-horticulture-outreach-network/canadas-top-10-most-important-invasive-horticultural-plants/ |
| Maryland | prohibited | Tier 1 Invasive, as of April 11, 2017 you cannot propagate, import, transfer, sell, purchase, transport, or introduce any Tier 1 invasive plant into Maryland. http://agrisk.umd.edu/blog/new-regulations-on-invasive-plants-in-maryland-go-into-effect |
| Massachusetts | prohibited | Banned from importation, propagation, sale, trade, and distribution. https://www.mass.gov/service-details/prohibited-plant-list-background |
| Michigan | discouraged | Prohibited in 2005 but later lifted, this is still considered a threat to Michigan wetlands however it is not currently listed as a banned or restricted species. http://www.michigan.gov/invasives/0,5664,7-324-68002_74282---,00.html |
| Minnesota | prohibited | Regulated invasive species that is not legal to possess, sell, buy, and transport. http://www.dnr.state.mn.us/invasives/laws.html |
| Montana | discouraged | Noxious weed, on state's list for containment & eradication. See video below. https://www.mtweed.org/weed_id/yellowflag-iris/ http://www.msuinvasiveplants.org/documents/mt_noxious_weeds/yellowflag_iris.pdf |
| Nebraska | discouraged | Not illegal, but state has ongoing eradication efforts in place to remove established invasive populations. See video below. http://www.neweed.org/documents/watchlist.pdf https://neinvasives.com/species/plants/yellow-flag-iris/ |
| New Brunswick | discouraged | Not illegal, but included on New Brunswick's Top 10 Unwanted Invaders species list. http://www.nbala.ca/invasive-plant-patrol-program/ |
| New Hampshire | prohibited | No person shall collect, transport, import, export, move, buy, sell, distribute, propagate or transplant any living and viable portion of any plant species, which includes all of their cultivars and varieties. https://www.agriculture.nh.gov/publications-forms/documents/prohibited-invasive-species.pdf |
| New Jersey | discouraged | Not illegal, but recently proposed for addition to the state's DO NOT PLANT list. http://www.princetonnj.gov/res-16-364-invasive-plant-species.pdf |
| New York | prohibited | Cannot be knowingly possessed with the intent to sell, import, purchase, transport or introduce. In addition, no person shall sell, import, purchase, transport, introduce or propagate prohibited invasive species. http://www.dec.ny.gov/docs/lands_forests_pdf/isprohibitedplants2.pdf |
| North Carolina | discouraged | Not illegal, but officially discouraged from cultivation. http://ncbg.unc.edu/plants-to-avoid/ |
| Ohio | discouraged | Not illegal, but listed as a well-established invasive posing moderate to severe threat to Ohio's natural areas. http://ohiodnr.gov/portals/0/pdfs/invasives/ohio-invasive-plants-r0400.pdf |
| Oklahoma | discouraged | Not illegal, but on the offical watch list as potentially invasive species. http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-9863/NREM-2895web.pdf https://www.wildlifedepartment.com/wildlifemgmt/swg/T44P1.PDF |
| Ontario | discouraged | Not illegal, but officially discouraged from cultivation. http://canadainvasives.ca/initiatives/national-horticulture-outreach-network/canadas-top-10-most-important-invasive-horticultural-plants/ |
| Oregon | discouraged | Class B noxious weed, quarantine required. https://www.portlandoregon.gov/bes/article/197414 |
| Pennsylvania | discouraged | Not illegal, but listed as a Rank 2 - Significant Threat species. http://www.docs.dcnr.pa.gov/cs/groups/public/documents/document/dcnr_20033302.pdf |
| Prince Edward Island | discouraged | Not illegal, but a priority species for monitoring on PEI Invasive Species Spotter’s Network. http://peiinvasives.ca/yellow-flag-iris |
| Quebec | discouraged | Not illegal, but officially discouraged from cultivation. http://canadainvasives.ca/initiatives/national-horticulture-outreach-network/canadas-top-10-most-important-invasive-horticultural-plants/ |
| Rhode Island | discouraged | Not illegal, but recognized as a well established invasive species in the state. https://www.anstaskforce.gov/State%20Plans/RI_SMP_Approved.pdf |
| Saskatchewan | discouraged | Not illegal, but officially discouraged from cultivation. http://canadainvasives.ca/initiatives/national-horticulture-outreach-network/canadas-top-10-most-important-invasive-horticultural-plants/ |
| South Carolina | discouraged | Not illegal, but officially discouraged from cultivation. http://ncbg.unc.edu/plants-to-avoid/ |
| Tennessee | discouraged | Ranked as significant threat, not illegal, but officially discouraged from cultivation. http://tnipc.org/invasive-plants/plant-details/?id=133 |
| Vermont | prohibited | Designated as a Class B noxious weed, prohibits the importation, movement, sale, pocession, cultivation and/or distribution of this species. http://agriculture.vermont.gov/plant_pest/plant_weed/invasive_noxious_weeds/noxious_weeds_list |
| Virginia | discouraged | Highest tier invasive, not illegal, but officially discouraged from cultivation. http://www.dcr.virginia.gov/natural-heritage/document/nh-invasive-plant-list-2014.pdf |
| Washington | discouraged | Class C noxious weed, can be designated illegal at county-level. https://www.nwcb.wa.gov/images/weeds/Yellow_flag_iris.pdf |
| West Virginia | prohibited | Tier 1 Invasive, Illegal to sell, transport, etc., without a permit which addresses environmental safety. https://efotg.sc.egov.usda.gov/references/public/WV/PlantPestAct.pdf |
| Wisconsin | prohibited | Formerly restricted, now prohibited as the restricted phase-out period expires in 2018. http://dnr.wi.gov/topic/invasives/documents/nr40plantlist.pdf |
Species Iris Group of North America
