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Status of Invasive Plants in New Hampshire

Total number of exotic species reported: 426

Total number of records in EDDMapS: 20843


Invasive Plants by Category

  • Aquatic - 13 species, 2232 records
  • Conifer Trees - 2 species, 11 records
  • Forbs/Herbs - 257 species, 5501 records
  • Grass or Grasslike - 55 species, 519 records
  • Hardwood Trees - 28 species, 2220 records
  • Shrub or Subshrub - 47 species, 6282 records
  • Vines - 24 species, 2339 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese knotweed - 2723 reports
  2. autumn olive - 2371 reports
  3. glossy buckthorn - 2094 reports
  4. oriental bittersweet - 2072 reports
  5. purple loosestrife - 2047 reports
  6. castor aralia - 1035 reports
  7. Norway maple - 1031 reports
  8. Japanese barberry - 305 reports
  9. winged burning bush - 283 reports
  10. multiflora rose - 241 reports

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

  1. Japanese barberry - 10/10 (100%)
  2. oriental bittersweet - 10/10 (100%)
  3. Canada thistle - 10/10 (100%)
  4. ground ivy - 10/10 (100%)
  5. bush honeysuckles (exotic) - 10/10 (100%)
  6. purple loosestrife - 10/10 (100%)
  7. multiflora rose - 10/10 (100%)
  8. common mullein - 10/10 (100%)
  9. cypress spurge - 10/10 (100%)
  10. Japanese knotweed - 10/10 (100%)

Counties with the most invasive species reported

  1. Strafford County - 347 species
  2. Coos County - 329 species
  3. Hillsborough County - 301 species
  4. Cheshire County - 295 species
  5. Rockingham County - 295 species
  6. Grafton County - 272 species
  7. Carroll County - 261 species
  8. Merrimack County - 219 species
  9. Sullivan County - 204 species
  10. Belknap County - 186 species

Counties with the least invasive species reported

  1. Belknap County - 186 species
  2. Sullivan County - 204 species
  3. Merrimack County - 219 species
  4. Carroll County - 261 species
  5. Grafton County - 272 species
  6. Rockingham County - 295 species
  7. Cheshire County - 295 species
  8. Hillsborough County - 301 species
  9. Coos County - 329 species
  10. Strafford County - 347 species

Report created on September 23, 2014 at 12:21 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.