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Status of Invasive Plants in Massachusetts

Total number of exotic species reported: 610

Total number of records in EDDMapS: 26636


Invasive Plants by Category

  • Aquatic - 19 species, 2609 records
  • Conifer Trees - 4 species, 47 records
  • Forbs/Herbs - 338 species, 8189 records
  • Grass or Grasslike - 82 species, 1550 records
  • Hardwood Trees - 56 species, 1169 records
  • Shrub or Subshrub - 70 species, 7291 records
  • Vines - 40 species, 2354 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. multiflora rose - 1652 reports
  2. glossy buckthorn - 1428 reports
  3. oriental bittersweet - 1380 reports
  4. purple loosestrife - 872 reports
  5. Japanese barberry - 866 reports
  6. perennial pepperweed - 812 reports
  7. garlic mustard - 493 reports
  8. reed canarygrass - 486 reports
  9. coltsfoot - 485 reports
  10. winged burning bush - 439 reports

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

  1. Canada thistle - 14/14 (100%)
  2. Norway maple - 14/14 (100%)
  3. garlic mustard - 14/14 (100%)
  4. oriental bittersweet - 14/14 (100%)
  5. spotted knapweed - 14/14 (100%)
  6. purple crown-vetch - 14/14 (100%)
  7. Japanese barberry - 14/14 (100%)
  8. ground ivy - 14/14 (100%)
  9. bush honeysuckles (exotic) - 14/14 (100%)
  10. purple loosestrife - 14/14 (100%)

Counties with the most invasive species reported

  1. Middlesex County - 549 species
  2. Essex County - 494 species
  3. Worcester County - 470 species
  4. Norfolk County - 463 species
  5. Hampshire County - 444 species
  6. Suffolk County - 441 species
  7. Berkshire County - 416 species
  8. Barnstable County - 406 species
  9. Hampden County - 404 species
  10. Plymouth County - 391 species

Counties with the least invasive species reported

  1. Dukes County - 290 species
  2. Nantucket County - 368 species
  3. Bristol County - 372 species
  4. Franklin County - 384 species
  5. Plymouth County - 391 species
  6. Hampden County - 404 species
  7. Barnstable County - 406 species
  8. Berkshire County - 416 species
  9. Suffolk County - 441 species
  10. Hampshire County - 444 species

Report created on September 2, 2015 at 10:31 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.