1. Aggressive Native Plants Trees

2. Big-toothed aspen (Populus grandidentata)

3. Boxelder (Acer negundo) Kitty Kohout Gary Fewless

4. Eastern cottonwood (Populus deltoides) Derek Anderson

5. Eastern red-cedar (Juniperus virginiana) Howard F. Schwartz, Colorado State University, Bugwood.org Keith Kanoti, Maine Forest Service, Bugwood.org

6. Honey locust (Gleditsia triacanthos)

7. Quaking aspen (Populus tremuloides) Christopher NollDerek Anderson Kenneth Sytsma

8. Aggressive Native Plants Shrubs

9. Gray dogwood (Cornus racemosa) Merel Black Paul Drobot Merel Black

10. Prickly ash (Zanthoxylum americanum) Christopher Noll

11. Red osier dogwood (Cornus stolinifera) Courtney LeClair

12. Smooth sumac (Rhus glabra) Kenneth Sytsma Merel Black

13. Staghorn sumac (Rhus hirta) Robert Bierman

14. Aggressive Native Plants Vines

15. Ground nut (Apios americana) Christopher Noll Merel Black

16. Poison ivy (Toxicodendron radicans) Christopher Noll Robert W. Freckmann

17. Aggressive Native Plants Forbs

18. Bracken fern (Pteridium aquilinum) Matthew Wagner

19. Canada goldenrod (Solidago canadensis) Christopher Noll Joshua Nemec Merel Black

20. Common ragweed (Ambrosia artemisiifolia) Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org Steve Dewey, Utah State University, Bugwood.org Merel Black Paul Drobot

21. Giant ragweed (Ambrosia trifida) Chris Evans, River to River CWMA, Bugwood.org Paul Drobot Theodore Webster, USDA Agricultural Research Service, Bugwood.org

22. Heal-all (Prunella vulgaris) Kenneth J. Sytsma

23. Stinging nettle (Urtica dioica) © J R Crellin 2004 Robert Vidéki, Doronicum Kft., Bugwood.org Richard Old, XID Services, Inc., Bugwood.org John Cardina, The Ohio State University, Bugwood.org

24. Virginia waterleaf (Hydrophyllum virginianum) Paul Drobot Merel Black

25. White snakeroot (Ageratina altissima) Merel Black

26. Wood nettle (Laportea canadensis) Christopher Noll