Image from Paul Skawinski

Garlic Mustard

(Alliaria petiolata)

Garlic mustard is a biennial forb with kidney-shaped to triangular leaves and small white flowers. It usually invades forests, and is fairly common in the state. For more information, visit the WDNR and Minnesota Wildflowers

Image from Paul Skawinski

Japanese Knotweed

(Reynoutria japonica/Fallopia japonica/Polygonum cuspidatum)

Japanese knotweed is a large, bamboo-like perennial herb. It can grow in very dense clumps especially along roadsides and streams. It is somewhat common in the state. For more information, see the WDNR and this UW-Extension Factsheet. CWIP also created a quick ID guide for this species.

Japanese Hedge Parsley

(Torilis japonica)

Japanese hedge parsley is a biennial forb that invades forests and roadsides. This plant has fern-like leaves, clusters of white flowers, and bur-like seeds. It is becoming more common in the state. Visit Minnesota Wildflowers and the WDNR for more information.

Image from Catherine Herms, The Ohio State University,

Lesser Celandine

(Ficaria verna/Ranunculus ficaria)

Lesser celandine is a low-growing plant with kidney or heart-shaped leaves and bright yellow flowers. It is only visible in the spring. Lesser celandine looks similar to native marsh marigold and prefers moist soils. It is not widespread in the state. For more information, see the WDNR and Wisconsin Wetlands Association

Image from Leslie J. Mehrhoff, University of Connecticut,

Narrow Leaf Bittercress

(Cardamine impatiens)

Narrow leaf bittercress is an annual or biennial plant with divided leaves and small whitish flowers. Narrowleaf bittercress invades forests, floodplains, and streambanks, but is not widespread in the state. For more information, visit WDNR and Minnesota Wildflowers

More species to be added soon!

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