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Managing Invasive Plants: Cutleaf Teasel, Japanese Hops, and Dalmatian Toadflax

This document provides an overview of three invasive plant species: Cutleaf Teasel (Dipsacus laciniatus), Japanese Hops (Humulus japonicus), and Dalmatian Toadflax (Linaria dalmatica). Cutleaf Teasel is a biennial plant that reproduces by seed and prefers sunny areas. Japanese Hops is an aggressive annual vine that smothers native vegetation, primarily found in riparian zones. Dalmatian Toadflax is a short-lived perennial that quickly colonizes dry, sunny habitats. Coordinated management efforts are underway to control these invasive plants across Minnesota.

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Managing Invasive Plants: Cutleaf Teasel, Japanese Hops, and Dalmatian Toadflax

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  1. Cutleaf Teasel Dipsacus laciniatus

  2. Cutleaf Teasel • Primarily biennial – dies after flowering • Reproduces by seed • Grows in sunny areas

  3. Cutleaf Teasel

  4. Japanese Hops Humulus japonicus

  5. Japanese Hops • Annual vine that grows so rapidly it smothers other vegetation • Reproduces by seed • Grows in sunny, often riparian areas • Beer is not made from Japanese hops

  6. Japanese Hops Downward pointing bracts are an identifying characteristic Credit: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Credit: Chris Evans, River to River CWMA, Bugwood.org

  7. Dalmatian Toadflax Linaria dalmatica

  8. Dalmatian Toadflax • Short-lived perennial • Tolerates a wide range of habitats but prefers sunny, dry areas • Colonizes areas quickly with sprouting from lateral roots and seed production

  9. Dalmatian Toadflax Yellow toadflax (left) has narrow leaves compared to Dalmatian (right)

  10. Sprouting after herbicide treatment browned stems – it is difficult to kill Dalmatian toadflax

  11. Eradication in Progress • Coordinated effort to contain and eliminate Dalmatian toadflax • The Nature Conservancy • MnDOT, DNR and MDA • Kittson County • Private Landowners

  12. Confirmed County LocationsAdditional Unconfirmed Reports Exist • Goodhue • Metro Area • Rochester • Winona • Koochiching • St. Louis • Koochiching • St. Louis • Hennepin • Ramsey Oriental bittersweet Brown knapweed Meadow knapweed Black swallow-wort • Washington • Houston • Mower • Olmsted • Ramsey • Wabasha • Washington • Winona • Fillmore • Houston • Cook • Kittson Grecian foxglove Cutleaf teasel Japanese hops Dalmatian toadflax

  13. Yellow Starthistle Centaurea solstitialis Image Credit: Steve Dewey, Utah Stat University, Bugwood.org

  14. Yellow Starthistle

  15. Common Teasel Dipsacus fullonum Image Credit: Steve Dewey, Utah State University, Bugwood.org

  16. Common Teasel

  17. Image credit: www.mumblingmountain.com/?tag=giant-hogweed Giant Hogweed Heracleummantegazzianum

  18. Giant Hogweed • Sap + human skin + light = severe burn • Biennial or perennial that reproduces by seed • Prefers sunny and moist sites but can grow in partial shade • Federal and state noxious weed

  19. Impediments to Rapid Response • Lack of funding • Lack of staff time for coordination activities • Lengthy processes and procedures prior to treatment • Contracts, notifications, etc. • Control strategies may be unavailable Cutleaf teasel, Dipsacus laciniatus

  20. Contact Information Monika Chandler, 651-201-6537 Minnesota Department of Agriculture Monika.Chandler@state.mn.us Cutleaf teasel, Dipsacus laciniatus

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