LANSING — On May 20, the Michigan Commission of Agriculture and Rural Development approved the addition of six species to Michigan’s invasive plant lists under Part 413 of the Natural Resources and Environmental Protection Act (NREPA), according to a Michigan Department of Natural Resources (DNR) press release on Thursday.

The commission’s decision was informed by public comments and a scientific review process led by the Michigan Department of Agriculture and Rural Development (MDARD), according to the release. MDARD received more than 2,000 public comments on this proposal, more than 90 percent of which were in favor of adding these plants to Michigan’s invasive species lists.

Pursuant to the commission’s decision, the following four plant species will be added to the restricted species list, according to the DNR. Effective Jan. 1, 2028, it will be unlawful to introduce, import, sell, possess with intent to distribute, or intentionally propagate these species in Michigan:

– Common buckthorn

– Glossy buckthorn

– Callery pear

– Japanese barberry

The following two plant species will be added to the prohibited species list, according to the release. Effective June 19, it will be unlawful to introduce, import, sell, possess with intent to distribute, or intentionally propagate these species in Michigan:

– Water hyacinth

– Water lettuce

The DNR stated that under Part 413 of NREPA, invasive species are defined as species that are not native to Michigan and that cause, or are likely to cause, harm to the environment, economy, and/or human health. Regulating invasive species helps limit their introduction and spread through sale, trade, transport, and intentional propagation. Prohibited species are not widely distributed in the state and pose a significant risk to human health or natural, agricultural, or forest resources, with limited effective management techniques available. Restricted species are already more widely established in Michigan but still pose risks to human health or natural, agricultural, or forest resources.

Property owners are not considered in violation if these invasive species are already established on their property or in adjacent waterways, according to the release.

MDARD first proposed adding common buckthorn, glossy buckthorn, Callery pear, Japanese barberry, water hyacinth, and water lettuce to Michigan’s invasive species lists in November 2025 after conducting Weed Risk Assessments, according to the DNR. During those assessments, MDARD experts evaluated the scientific literature, verified plant distribution data and climate modeling, and reviewed other evidence-based criteria. Based on those actions, MDARD determined that the six species pose a risk to Michigan’s environment, economy, and/or public health.

In January and February 2026, MDARD collected public comments from stakeholders, industry representatives, environmental organizations, local governments and Michigan residents, the release stated. MDARD evaluated the public comments and presented its findings to the Michigan Commission of Agriculture and Rural Development at its March 2026 meeting. The commission voted to add all six proposed plant species to Michigan’s prohibited and restricted plant lists at its meeting on May 20.