Maryland Invasive Plants Prevention and Control


The first five weed risk assessments (WRAs) are complete. See the list on the right side of this page with links to the documents.  The recommended rankings will be published in regulations that will be posted in draft form on this Website soon. (June 12, 2015)

DRAFT Tier 2 signage​


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

Initial regulations were promulgated in January of 2013. See the Maryland Regulation of Invasive Plants regulations here. The remaining regulations, including proposed Tier 1 and Tier 2 plant lists are expected to be ready in April of 2015. Draft regulations will be posted on this site for preliminary review and comment prior to submission of the final proposed regulations.

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

Initial List of Plant Being Assessed for Possible Listing as Tier 1 or Tier 2 Invasive Plants

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; and
  • 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

initial_target_spp_list_for_assessment.pdfInitial List of Plants Being Assessed for Possible Listing as Tier 1 or Tier 2 Invasive Plants


  • 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.
  • 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 exceeding $500 for each violation.
  • Title 12 Criminal Penalties

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

Page Last Updated: 09/05/2014