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Status of Invasive Plants in Maine

Total number of exotic species reported: 466

Total number of records in EDDMapS: 10386


Invasive Plants by Category

  • Aquatic - 14 species, 427 records
  • Conifer Trees - 3 species, 24 records
  • Forbs/Herbs - 288 species, 4630 records
  • Grass or Grasslike - 60 species, 826 records
  • Hardwood Trees - 31 species, 419 records
  • Shrub or Subshrub - 44 species, 1644 records
  • Vines - 25 species, 553 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese knotweed - 275 reports
  2. multiflora rose - 229 reports
  3. Japanese barberry - 204 reports
  4. oriental bittersweet - 191 reports
  5. Morrow's honeysuckle - 171 reports
  6. bush honeysuckles (exotic) - 170 reports
  7. purple loosestrife - 149 reports
  8. glossy buckthorn - 147 reports
  9. reed canarygrass - 107 reports
  10. bittersweet nightshade - 96 reports

Top Ten Widespread Invasive Plants (by number of positive counties)

  1. Norway maple - 16/16 (100%)
  2. bush honeysuckles (exotic) - 16/16 (100%)
  3. common chickweed - 16/16 (100%)
  4. common mullein - 16/16 (100%)
  5. bull thistle - 16/16 (100%)
  6. Japanese knotweed - 16/16 (100%)
  7. common yarrow - 16/16 (100%)
  8. yellow toadflax - 16/16 (100%)
  9. common St. Johnswort - 16/16 (100%)
  10. orange hawkweed - 16/16 (100%)

Counties with the most invasive species reported

  1. Cumberland County - 395 species
  2. York County - 387 species
  3. Knox County - 348 species
  4. Penobscot County - 341 species
  5. Hancock County - 325 species
  6. Oxford County - 315 species
  7. Waldo County - 299 species
  8. Kennebec County - 287 species
  9. Lincoln County - 266 species
  10. Aroostook County - 262 species

Counties with the least invasive species reported

  1. Piscataquis County - 189 species
  2. Washington County - 225 species
  3. Sagadahoc County - 237 species
  4. Franklin County - 250 species
  5. Somerset County - 256 species
  6. Androscoggin County - 258 species
  7. Aroostook County - 262 species
  8. Lincoln County - 266 species
  9. Kennebec County - 287 species
  10. Waldo County - 299 species

Report created on October 25, 2014 at 02:54 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.