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Status of Invasive Plants in Utah

Total number of exotic species reported: 437

Total number of records in EDDMapS: 148431


Invasive Plants by Category

  • Aquatic - 8 species, 2324 records
  • Forbs/Herbs - 247 species, 117065 records
  • Grass or Grasslike - 85 species, 7533 records
  • Hardwood Trees - 34 species, 9435 records
  • Shrub or Subshrub - 33 species, 5638 records
  • Vines - 17 species, 2779 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. squarrose knapweed - 31714 reports
  2. musk thistle - 12859 reports
  3. saltcedar - 9013 reports
  4. hoary cress - 8322 reports
  5. Scotch thistle - 8015 reports
  6. houndstongue - 6077 reports
  7. Canada thistle - 5905 reports
  8. Russian knapweed - 4782 reports
  9. perennial pepperweed - 4141 reports
  10. tamarisk - 3415 reports

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

  1. Russian olive - 29/29 (100%)
  2. musk thistle - 29/29 (100%)
  3. Canada thistle - 29/29 (100%)
  4. common mullein - 29/29 (100%)
  5. bull thistle - 29/29 (100%)
  6. common yarrow - 29/29 (100%)
  7. field bindweed - 29/29 (100%)
  8. Russian knapweed - 29/29 (100%)
  9. creeping bentgrass - 29/29 (100%)
  10. prostrate pigweed - 29/29 (100%)

Counties with the most invasive species reported

  1. Kane County - 713 species
  2. Garfield County - 544 species
  3. Utah County - 370 species
  4. Salt Lake County - 364 species
  5. Washington County - 319 species
  6. Cache County - 289 species
  7. Weber County - 241 species
  8. Uintah County - 215 species
  9. San Juan County - 208 species
  10. Davis County - 206 species

Counties with the least invasive species reported

  1. Morgan County - 118 species
  2. Piute County - 131 species
  3. Iron County - 131 species
  4. Carbon County - 144 species
  5. Beaver County - 144 species
  6. Daggett County - 151 species
  7. Wayne County - 154 species
  8. Emery County - 157 species
  9. Rich County - 160 species
  10. Sevier County - 166 species

Report created on July 1, 2015 at 08:55 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.