Maryland Invasive Plants Prevention and Control


 A Notice of Final Action for the Maryland Invasive Plant Regulations was published in the April 1 Maryland Register. The new regulations here went into effect April 11. These regulations establish lists of Tier 1 and Tier 2 invasive plants, and require that signage be placed near retail displays of Tier 2 plants. The regulations also describe mechanisms for listing and delisting invasive species, procedures for the disposal of Tier 1 plants, and an outline of conditions under which the Secretary’s approval may be given for otherwise prohibited activities.  

Invasive plants threaten native plant health and biodiversity in both agricultural and natural systems in Maryland. Many of these problematic plants are imported, bred, distributed and promoted for sale in the landscape and nursery industries. Maryland’s Invasive Plant Advisory Committee (IPAC) was established by legislative mandate in October 2011. The IPAC’s primary responsibility is to advise the Secretary of Agriculture on regulating the sale of invasive plants, and preventing them from entering Maryland or from spreading further in the state. Using a scientific weed risk assessment protocol, IPAC will classify invasive plants as Tier 1 or Tier 2 and recommend regulations to reduce the risk of invasive plants in Maryland. See list of ipac_members_October 2016.pdfIPAC Members 

The Maryland Invasive Plants Prevention and Control Law is accessible via the following website: Click on Code of Maryland and Rules>Agriculture>Title 9.5>Invasive Plants Prevention and Control>Subtitle 1, 2, and 3. 

Invasive Plant Lists and Requirements

Tier 1 Invasive Plants  

The following plants are designated as Tier 1 invasive plants in Maryland April 11, 2016. Efffective immedicately a person may not acquire a new Tier I invasive plant. According to phase-in provisions these plants are subject to the restrictions below as of April 12, 2017.
 Ficaria verna (fig buttercup)
 Geranium lucidum (shining cranesbill)
Iris pseudacorus
(yellow flag iris)

Restrictions - Except as provided below, a person may not propagate, import, transfer, sell, purchase, transport, or introduce any living part of a Tier 1 invasive plant in the State. These restrictions do not apply to the transfer, lease, sale, or purchase of real property on which an invasive plant is located.

Exemptions - A person may conduct a prohibited activity if:

  • The person receives approval from the Secretary before conducting the activity;
  • The activity is for the purpose of:
  • Disposing of the invasive plant
  • Controlling the invasive plant
  • Using the invasive plant for research or educational purposes; or
  • Exporting the invasive plant out of the State.

Tier 2 Invasive Plants 

The following plants are designated as Tier 2 invasive Plants in Maryland
​, effective April 11, 2016
According to phase-in provisions,
 these plants are subject to the restrictions below as of July 12, 201
Euonymus alatus (burning bush)
Ligustrum obtusifolium (blunt-leaved or border privet)
Wisteria sinensis (Chinese wisteria)
Wisteria floribunda (Japanese wisteria)
Wisteria x formosa (floribunda x sinensis hybrids)


  • A person may not sell or offer for sale at a retail outlet a Tier 2 invasive plant unless the retail outlet posts in a conspicuous manner in proximity to all Tier 2 plant displays, a sign identifying the plants as Tier 2 plants. Required insignia can be found under Information for Nursery & Landscape Professionals on the right hand side of this page.
  • A person may not provide landscaping services to plant or supply for planting a Tier 2 invasive plant unless the person provides to its customer a list of Tier 2 invasive plants.



  • The Secretary may impose a civil penalty not to exceed $500 for each violation.
  • Title 12 Criminal Penalties

Legal Authority: Md. AGRICULTURE Code Ann. § 9.5-101 et. seq.

Info for Nursery & LandscapeProfessionals

Required Tier 2 Invasive Plant sign insignia.
Must be minimum of 5” tall x 7” wide and reproduced in black on a bright yellow background.
IPACSign_BW.pngB&W (.png)
IPACSign_Color.jpgColor (.jpg)
IPACSign_Color.pngColor (.png)
IPACSign_Color.pdfColor (.pdf)

Info for Gardeners

Coming Soon!