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Status of Invasive Plants in Utah

Total number of exotic species reported: 440

Total number of records in EDDMapS: 169998


Invasive Plants by Category

  • Aquatic - 8 species, 3421 records
  • Forbs/Herbs - 249 species, 136669 records
  • Grass or Grasslike - 86 species, 8212 records
  • Hardwood Trees - 34 species, 9496 records
  • Shrub or Subshrub - 35 species, 5720 records
  • Vines - 17 species, 2984 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. squarrose knapweed - 32883 reports
  2. musk thistle - 13399 reports
  3. goatsrue - 10249 reports
  4. Scotch thistle - 9150 reports
  5. saltcedar - 9073 reports
  6. hoary cress - 8695 reports
  7. Canada thistle - 6989 reports
  8. houndstongue - 6336 reports
  9. Russian knapweed - 6011 reports
  10. perennial pepperweed - 4372 reports

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

  1. musk thistle - 29/29 (100%)
  2. Canada thistle - 29/29 (100%)
  3. Russian olive - 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 - 715 species
  2. Garfield County - 545 species
  3. Utah County - 371 species
  4. Salt Lake County - 365 species
  5. Washington County - 317 species
  6. Cache County - 289 species
  7. Weber County - 241 species
  8. Uintah County - 215 species
  9. Davis County - 212 species
  10. San Juan County - 208 species

Counties with the least invasive species reported

  1. Morgan County - 118 species
  2. Iron County - 130 species
  3. Piute County - 131 species
  4. Beaver County - 143 species
  5. Carbon County - 144 species
  6. Daggett County - 150 species
  7. Wayne County - 155 species
  8. Emery County - 157 species
  9. Rich County - 160 species
  10. Sevier County - 165 species

Report created on February 12, 2016 at 12:39 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.