The Michigan Department of Agriculture & Rural Development (MDARD) could prohibit or restrict several invasive plant species, the popular landscaping Callery pear tree and Japanese barberry shrub among them. The public can submit feedback on the fate of these flowering plants and the other proposed species in a survey created by the department.

According to MDARD, they are:

  1. Common buckthorn
  2. Glossy buckthorn
  3. Callery pear
  4. Japanese barberry
  5. Water hyacinth
  6. Water lettuce