Status of Invasive Plants in New Hampshire

Total number of exotic species reported: 423

Total number of records in EDDMapS: 20330


Invasive Plants by Category

  • Aquatic - 13 species, 2197 records
  • Conifer Trees - 2 species, 11 records
  • Forbs/Herbs - 254 species, 5353 records
  • Grass or Grasslike - 46 species, 449 records
  • Hardwood Trees - 27 species, 2214 records
  • Shrub or Subshrub - 46 species, 6127 records
  • Vines - 24 species, 2286 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese knotweed - 2671 reports
  2. autumn olive - 2350 reports
  3. glossy buckthorn - 2049 reports
  4. oriental bittersweet - 2040 reports
  5. purple loosestrife - 2012 reports
  6. castor aralia - 1035 reports
  7. Norway maple - 1026 reports
  8. Japanese barberry - 283 reports
  9. winged burning bush - 280 reports
  10. multiflora rose - 215 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 - 338 species
  2. Coos County - 322 species
  3. Hillsborough County - 288 species
  4. Rockingham County - 287 species
  5. Cheshire County - 283 species
  6. Grafton County - 264 species
  7. Carroll County - 251 species
  8. Merrimack County - 206 species
  9. Sullivan County - 196 species
  10. Belknap County - 178 species

Counties with the least invasive species reported

  1. Belknap County - 178 species
  2. Sullivan County - 196 species
  3. Merrimack County - 206 species
  4. Carroll County - 251 species
  5. Grafton County - 264 species
  6. Cheshire County - 283 species
  7. Rockingham County - 287 species
  8. Hillsborough County - 288 species
  9. Coos County - 322 species
  10. Strafford County - 338 species

Report created on April 23, 2014 at 03:34 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.



Bugwood Center Developed by The University of Georgia - Center for Invasive Species and Ecosystem Health.
Last updated on Tuesday, December 04, 2012 at 08:59 AM