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

Click on image to access species profile information


American skunk cabbage

Giant Chilean rhubarb


Curly waterweed
Curly waterweed

Floating pennywort
Floating pennywort

Water primrose
Water primrose

Grey squirrel
Grey squirrel

Muntjac deer
Muntjac deer

Parrot's feather
Parrot’s feather

Freshwater terrapins

Ruddy duck
Ruddy duck

Siberian chipmunk
Siberian chipmunk

Giant hogweed

Himalayan balsam

Nuttall’s waterweed
New Zealand flatworm

Species not recorded in Ireland



Amur sleeper

Asian hornet


Asian mongoose

Egyptian goose

Fox squirrel

Indian house crow


North american bullfrog

Pallas’s squirrel

Raccoon dog

Sacred ibis

South American coati

Stone moroko

 Marbled crayfish

Red swamp crayfish

Signal crayfish
Spiny-cheek crayfish

Virile crayfish


Chinese mitten crab



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