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Status of Invasive Plants in Wisconsin

Total number of exotic species reported: 529

Total number of records in EDDMapS: 40632


Invasive Plants by Category

  • Aquatic - 17 species, 4415 records
  • Conifer Trees - 2 species, 80 records
  • Forbs/Herbs - 339 species, 21103 records
  • Grass or Grasslike - 67 species, 3888 records
  • Hardwood Trees - 32 species, 1184 records
  • Shrub or Subshrub - 46 species, 3375 records
  • Vines - 23 species, 1084 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. wild parsnip - 2413 reports
  2. purple loosestrife - 1488 reports
  3. teasel - 1414 reports
  4. garlic mustard - 1290 reports
  5. common reed - 1053 reports
  6. Eurasian water-milfoil - 892 reports
  7. spotted knapweed - 711 reports
  8. showy fly honeysuckle, Bell's honeysuckle - 638 reports
  9. curly-leaved pondweed - 621 reports
  10. Japanese knotweed - 610 reports

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

  1. purple loosestrife - 72/72 (100%)
  2. common mullein - 72/72 (100%)
  3. common yarrow - 72/72 (100%)
  4. yellow toadflax - 72/72 (100%)
  5. European cranberrybush - 72/72 (100%)
  6. white campion - 72/72 (100%)
  7. bush honeysuckles (exotic) - 71/72 (99%)
  8. bladder campion - 71/72 (99%)
  9. bull thistle - 70/72 (97%)
  10. hoary alyssum - 70/72 (97%)

Counties with the most invasive species reported

  1. Dane County - 394 species
  2. Milwaukee County - 332 species
  3. Walworth County - 323 species
  4. Sheboygan County - 312 species
  5. Racine County - 306 species
  6. Brown County - 305 species
  7. Rock County - 296 species
  8. Kenosha County - 286 species
  9. Douglas County - 279 species
  10. Ashland County - 267 species

Counties with the least invasive species reported

  1. Menominee County - 84 species
  2. Pepin County - 105 species
  3. Clark County - 114 species
  4. Barron County - 122 species
  5. Rusk County - 123 species
  6. Burnett County - 130 species
  7. Washburn County - 134 species
  8. Dunn County - 136 species
  9. Eau Claire County - 138 species
  10. Florence County - 140 species

Report created on May 23, 2015 at 12:14 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.