It may soon be illegal to sell or distribute 33 – or more – plants deemed invasive in the State of Maine, provided that a new rule was adopted by the state in January (press time being earlier than legislative schedules). The rule would make it illegal to buy, sell, import or grow the plants named, but growers and retailers who currently offer them would be exempt until the end of 2017. Violation could result in a $500 fine.

The proposed regulations had been considered in the state for more than a decade, and hearings included representatives from the green industry. Maine is the last state in the Northeast to implement such legislation.

The rule allows for a five-year review and amendment of the list, during which time stakeholders can petition for changes (removal or addition) based on scientific evidence proving a plant’s guilt or innocence.

The plants are divided into three categories: “Invasive,” “Likely Invasive” and “Potentially Invasive,” and include:


  • Acer platanoides
  • Aliaria petiolata
  • Berberis thunbergii
  • Celastrus orbiculatus
  • Elaeagnus umbellata
  • Euonymous alatus
  • Fallopia japonica
  • Frangula alnus
  • Hesperius matronalis
  • Iris pseudacorus
  • Lonicera morrowii
  • Lonicera salicaria
  • Lythrum salicaria
  • Robinia pseudoacacia
  • Rosa multiflora

Likely invasive:

  • Acer ginnala
  • Aegopodium podagraria
  • Ailanthus altissima
  • Amorpha fruiticosa
  • Artemesia vulgaris
  • Berberis vulgaris
  • Euphorbia cyparissias
  • Ligustrum valgare
  • Lonicera japonica
  • Lonicera maawckii
  • Populus alba
  • Impatiens glandulifera

Potentially invasive:

  • Ampelopsis glandulosa
  • Fallopia baldschuanica
  • Microstegium vimineum
  • Paulownia tomentosa
  • Persicaria perfoliata
  • Phellodendron amurense