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Status of Invasive Plants in Maine

Total number of exotic species reported: 459

Total number of records in EDDMapS: 10393


Invasive Plants by Category

  • Aquatic - 14 species, 427 records
  • Conifer Trees - 3 species, 24 records
  • Forbs/Herbs - 283 species, 4309 records
  • Grass or Grasslike - 59 species, 826 records
  • Hardwood Trees - 31 species, 419 records
  • Shrub or Subshrub - 43 species, 1615 records
  • Vines - 25 species, 553 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. multiflora rose - 229 reports
  2. Japanese barberry - 204 reports
  3. oriental bittersweet - 191 reports
  4. Morrow's honeysuckle - 171 reports
  5. bush honeysuckles (exotic) - 170 reports
  6. purple loosestrife - 149 reports
  7. glossy buckthorn - 147 reports
  8. reed canarygrass - 107 reports
  9. bittersweet nightshade - 96 reports
  10. European buckthorn - 92 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. common yarrow - 16/16 (100%)
  7. yellow toadflax - 16/16 (100%)
  8. orange hawkweed - 16/16 (100%)
  9. meadow hawkweed - 16/16 (100%)
  10. common St. Johnswort - 16/16 (100%)

Counties with the most invasive species reported

  1. Cumberland County - 395 species
  2. York County - 386 species
  3. Knox County - 347 species
  4. Penobscot County - 340 species
  5. Hancock County - 325 species
  6. Oxford County - 314 species
  7. Waldo County - 299 species
  8. Kennebec County - 287 species
  9. Lincoln County - 266 species
  10. Aroostook County - 261 species

Counties with the least invasive species reported

  1. Piscataquis County - 189 species
  2. Washington County - 225 species
  3. Sagadahoc County - 236 species
  4. Franklin County - 250 species
  5. Somerset County - 256 species
  6. Androscoggin County - 259 species
  7. Aroostook County - 261 species
  8. Lincoln County - 266 species
  9. Kennebec County - 287 species
  10. Waldo County - 299 species

Report created on September 4, 2015 at 10:33 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.