Invasive Plants in Maine

While Maine has historically experienced low levels of invasive plants, ornamental and landscape planting is causing a rapid increase in invasive plant issues. About 67% of invasive plants originate through landscaping practices. Other invasive species have made their way here through packaging and shipping.

Invasive species often lack natural predators and pathogens, and can therefore effectively outcompete native species. An ecosystem relies on a balance between every component of life to maintain biodiversity but when a new species arrives, it disrupts that balance.

Some of the key offending species Maine landowners need to be aware of are:

• Japanese multiflora rose
• Ornamental pear
• Garlic mustard
• Norway maple
• Japanese barberry
• Porcelain berry
• Tatarian honeysuckle
• Asiatic bittersweet
• Block swallowwort
• Japanese honeysuckle
• Burning bush
• Mile-a-minute weed-transported in soil
• Japanese knotweed

These are all non-native species that have exhibited invasive behaviors in Maine and have the potential to move quickly into ecosystems and destroy existing biodiversity.

Prevention is the key in deterring invasive plants and promoting Maine’s natural habitats.
Consider these few tips on preventing the spread of invasive plant species:

• Find out whether the plants you buy are native or invasive species, choose plants that are natural to the area, and promote Maine’s natural biodiversity.

• Remove invasive species from your own property, and if you have the time, volunteer to help remove invasive species from state land.

Invasive species threaten our state’s delicate biodiversity, alter the appearance of Maine’s landscape, can diminish recreational experiences, and decrease property values. It will take education and prevention to help maintain the natural ecosystems and protect against invasive plant species.