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Status of Invasive Plants in Massachusetts

Total number of exotic species reported: 615

Total number of records in EDDMapS: 26453


Invasive Plants by Category

  • Aquatic - 20 species, 2601 records
  • Conifer Trees - 4 species, 47 records
  • Forbs/Herbs - 342 species, 9356 records
  • Grass or Grasslike - 82 species, 1468 records
  • Hardwood Trees - 56 species, 1168 records
  • Shrub or Subshrub - 71 species, 7277 records
  • Vines - 39 species, 2350 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. multiflora rose - 1644 reports
  2. glossy buckthorn - 1428 reports
  3. oriental bittersweet - 1379 reports
  4. Japanese knotweed - 1125 reports
  5. purple loosestrife - 864 reports
  6. Japanese barberry - 855 reports
  7. perennial pepperweed - 812 reports
  8. reed canarygrass - 486 reports
  9. coltsfoot - 483 reports
  10. garlic mustard - 483 reports

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

  1. oriental bittersweet - 14/14 (100%)
  2. Canada thistle - 14/14 (100%)
  3. Norway maple - 14/14 (100%)
  4. Japanese barberry - 14/14 (100%)
  5. garlic mustard - 14/14 (100%)
  6. spotted knapweed - 14/14 (100%)
  7. purple crown-vetch - 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 - 495 species
  3. Worcester County - 471 species
  4. Norfolk County - 463 species
  5. Hampshire County - 442 species
  6. Suffolk County - 441 species
  7. Berkshire County - 418 species
  8. Barnstable County - 406 species
  9. Hampden County - 405 species
  10. Plymouth County - 390 species

Counties with the least invasive species reported

  1. Dukes County - 290 species
  2. Nantucket County - 366 species
  3. Bristol County - 373 species
  4. Franklin County - 385 species
  5. Plymouth County - 390 species
  6. Hampden County - 405 species
  7. Barnstable County - 406 species
  8. Berkshire County - 418 species
  9. Suffolk County - 441 species
  10. Hampshire County - 442 species

Report created on November 21, 2014 at 03:04 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.