Invasive Species

What is an invasive species?

An invasive species is a non-native species that spreads and grows rapidly and causes economic, environmental or social harm. 

Some Invasive Species found on PEI:

• Japanese Knotweed

• Glossy Buckthorn

• Himalayan Balsam

• Bittersweet Nightshade

• Giant Hogweed

• Wild Cucumber

• Purple Loosestrife 

Invasive Species SAWIG Manages in the Watershed

Bittersweet Nightshade - Bittersweet Nightshade is primarily found in riparian zones, where it thrives especially well. This invasive is known to slow flow rate and prevent fish passage which causes sedimentation. This is especially harmful to small streams.

Japanese Knotweed - Japanese Knotweed is one of the worst invaders according to Global Invasive Species Databases. This plant is widespread on PEI and can withstand weather conditions such as high temperature and drought. Once settled in a particular area, Japanese Knotweed can take years to manage.

Himalayan Balsam - Himalayan Balsam produces seeds at a very high rate (~2500 seeds per plant), and they can spread very quickly. This plant has a very weak root which, along with outcompeting native plants, can cause erosion in riparian zones. Himalayan Balsam is also a pollinator, which means it competes with other native pollinator plants.

Purple Loosestrife - Purple Loosestrife invades/destroys plant life around rivers, streams and wetlands. It tends to grow in clusters that outcompete native plants and deters wildlife. It is also a prolific seed producer and the seeds can get carried by the wind making them widespread.

Garlic Mustard

In Progress