Click here to download the full list of 66 Invasive Alien Species of Union concern.

View the European Commission’s Invasive Alien Species of Union concern brochure:

See Frequently Asked Questions on the EU IAS Regulation issued by NPWS:

View the IUCN’s info-graphic guide to the EU Regulation on Invasive Alien Species.

If you spot any errors or have information that can add to the species profiles please let us know. E-mail:

Species recorded in Ireland and established

Click on image to access species profile information

American skunk cabbage

Giant Chilean rhubarb

Chinese mitten crab

Curly waterweed
Curly waterweed

Giant hogweed

Grey squirrel
Grey squirrel
Himalayan balsam
Nuttall’s waterweed

New Zealand flatworm

Parrot's feather
Parrot’s feather

Water primrose
Water primrose


Species recorded in Ireland in recent years but are not known to be established




Egyptian goose

Indian house crow

Muntjac deer
Muntjac deer


Ruddy duck
Ruddy duck


Sacred ibis

Siberian chipmunk
Siberian chipmunk

Freshwater terrapins


Species not recorded in Ireland

– Animals


Amur sleeper

Asian hornet


Asian mongoose

Fox squirrel

North american bullfrog

Pallas’s squirrel


Raccoon dog

South American coati

Stone moroko

 Marbled crayfish

Red swamp crayfish

Signal crayfish
Spiny-cheek crayfish

Virile crayfish



– Plants​

Alligator weed

Asiatic tearthumb

Broadleaf watermilfoil

Common milkweed

Crimson fountaingrass

 Eastern Baccharis

Green cabomba

Japanese stiltgrass


Kudzu vine


Persian hogweed


Sosnowski’s hogweed


Water hyacinth


Whitetop weed