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Status of Invasive Plants in Idaho

Total number of exotic species reported: 432

Total number of records in EDDMapS: 121698


Invasive Plants by Category

  • Aquatic - 12 species, 2606 records
  • Conifer Trees - 1 species, 2 records
  • Forbs/Herbs - 271 species, 102514 records
  • Grass or Grasslike - 72 species, 2174 records
  • Hardwood Trees - 27 species, 1118 records
  • Shrub or Subshrub - 25 species, 2495 records
  • Vines - 23 species, 2335 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. leafy spurge - 20344 reports
  2. Canada thistle - 11967 reports
  3. spotted knapweed - 11490 reports
  4. rush skeletonweed - 7930 reports
  5. Scotch thistle - 6689 reports
  6. musk thistle - 5544 reports
  7. hoary cress - 4476 reports
  8. yellow toadflax - 3578 reports
  9. tansy ragwort - 3458 reports
  10. Russian knapweed - 3145 reports

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

  1. Canada thistle - 44/44 (100%)
  2. spotted knapweed - 44/44 (100%)
  3. field bindweed - 44/44 (100%)
  4. Scotch thistle - 44/44 (100%)
  5. cheatgrass - 44/44 (100%)
  6. poison-hemlock - 43/44 (98%)
  7. Russian knapweed - 43/44 (98%)
  8. hoary cress - 43/44 (98%)
  9. musk thistle - 42/44 (95%)
  10. leafy spurge - 42/44 (95%)

Counties with the most invasive species reported

  1. Idaho County - 328 species
  2. Latah County - 311 species
  3. Ada County - 282 species
  4. Kootenai County - 271 species
  5. Nez Perce County - 265 species
  6. Bonner County - 256 species
  7. Canyon County - 221 species
  8. Bannock County - 205 species
  9. Washington County - 204 species
  10. Owyhee County - 202 species

Counties with the least invasive species reported

  1. Jerome County - 52 species
  2. Minidoka County - 65 species
  3. Camas County - 72 species
  4. Lincoln County - 81 species
  5. Jefferson County - 91 species
  6. Oneida County - 94 species
  7. Teton County - 98 species
  8. Payette County - 100 species
  9. Franklin County - 105 species
  10. Gooding County - 117 species

Report created on July 28, 2014 at 10:39 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.