Click on the plant name to learn more about the species. Not all invasive plants are listed on this page. If you are looking for a particular plant, you can use the search bar at the top of this page.

The PEI Invasive Species Council has drafted a prioritized list of invasive plants for the province. Council members prioritized species on this list using the B.C. Invasive Plant Core Ranking Process. Click the thumbnail below to access the Draft PEI Invasive Alien Species Plant List.

The species listed in RED are highest priority and species listed in BLUE are not yet present in PEI – if you spot one of these species, please report it right away. This list is a work on progress, it does not include all of the invasive species on PEI.

PEI Draft IS Plant List

Wild Parsnip (Pastinaca sativa)

Wild parsnip, also known as poison parsnip, is native to Europe and Asia.  The plant’s root resembles the domestic parsnip and is also edible.  It’s likely that it was brought to North America by European settlers as a food source.  Wild parsnip is related to giant hogweed and shares some similar properties, including sap that […]

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Common Reed Grass (Phragmites australis ssp. australis)

Common reed grass (Phragmites australis ssp. australis) is an invasive perennial grass that is native to Eurasia.  It is not known for certain how it was moved to North America, but it likely arrived on the Atlantic coast accidentally via ballast materials in the late 1700s – early 1800s.  (Swearingen, J. and K. Saltonstall. 2010) […]

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Canada Waterweed (Elodea canadensis)

Canada waterweed is an underwater perennial.  It grows in dense mats in clear waters.  Most people know it as an aquarium plant.  It is considered native to Nova Scotia and New Brunswick, but outcompetes native pond weeds in Island waterbodies.  Canada waterweed was first detected in PEI at Knox’s Damn, Head of Montague, in 2005, […]

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Cypress Spurge (Euphorbia cyparissias)

Cypress spurge is a herbaceous perennial plant.  It grows in open, disturbed areas such as pastures, abandoned fields, ditches and coastal areas.   IDENTIFICATION Here are some key features that may help to positively identify cypress spurge: Can grow to 10-40cm tall Leaves are small, linear-shaped, 1-3cm long and 1-3mm wide, whorled around the stem […]

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Blackthorn (Prunus spinosa)

Blackthorn is a small, deciduous shrubby tree.  It grows best in moist, well drained soils and full sun.  It is native to most of Europe, the UK and Western Asia.  It is often referred to as “sloe”.  It has a native lookalike on PEI, Hawthorn (Crataegus spp.).  However, blackthorn spines have buds growing along their […]

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Black Knapweed (Centaurea nigra)

Black Knapweed is a perennial plant native to the Meditarranean, but is also naturalized throughout Europe.  Black Knapweed was first introduced to North America in the early 1900s as an ornamental species, and is now present is most Canadian provinces.  It tolerates a wide range of conditions and habitats, however it grows best in disturbed, […]

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Flowering Rush (Butomus umbellatus)

  Flowering rush is an aquatic perennial that resembles our native sedge species.  It can be difficult to distinguish from native sedges, unless it is in flower.  It can grow in dense stand both in and out of water.  This species is still sometimes sold in garden centers and is readily available for purchase online. […]

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Leafy Spurge (Euphorbia esula)

  Leafy spurge is a herbaceous perennial plant.  It grows in open disturbed areas such as pastures, abandoned fields, ditches and coastal areas.  It is native to central and southern Europe.  All parts of the plant contain a milky latex (sap) that can irritate livestock and cause rashes and skin irritations in humans.     […]

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Sycamore Maple (Acer pseudoplatanus)

  Sycamore Maple is a deciduous tree species that can reach 20m in height.  It is a very adaptable species that grows in full sun or light shade, and tolerates some salt.  It is native to Europe and western Asia.       IDENTIFICATION Here are some key features that may help to positively identify […]

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Oriental Bittersweet (Celastrus orbiculatus)

Oriental Bittersweet is a deciduous, woody vine.  It can be found growing in woodlands, forest edges, grasslands, roadsides, hedgerows – essentially anywhere except in wet areas.  This species’ generalist approach means that Oriental Bittersweet has an increased probability of finding suitable habitat to establish and invade.     IDENTIFICATION Here are some key features that […]

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