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Status of Invasive Plants in Wisconsin

Total number of exotic species reported: 523

Total number of records in EDDMapS: 38565


Invasive Plants by Category

  • Aquatic - 16 species, 4233 records
  • Conifer Trees - 2 species, 80 records
  • Forbs/Herbs - 339 species, 19686 records
  • Grass or Grasslike - 66 species, 3893 records
  • Hardwood Trees - 30 species, 1167 records
  • Shrub or Subshrub - 45 species, 2934 records
  • Vines - 23 species, 1065 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. wild parsnip - 2399 reports
  2. teasel - 1412 reports
  3. purple loosestrife - 1316 reports
  4. common reed - 1045 reports
  5. Eurasian water-milfoil - 892 reports
  6. curly-leaved pondweed - 621 reports
  7. showy fly honeysuckle, Bell's honeysuckle - 618 reports
  8. Japanese knotweed - 600 reports
  9. garlic mustard - 579 reports
  10. spotted knapweed - 555 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 - 387 species
  2. Milwaukee County - 328 species
  3. Walworth County - 322 species
  4. Sheboygan County - 309 species
  5. Racine County - 305 species
  6. Brown County - 304 species
  7. Rock County - 296 species
  8. Kenosha County - 285 species
  9. Douglas County - 279 species
  10. Bayfield County - 266 species

Counties with the least invasive species reported

  1. Menominee County - 84 species
  2. Pepin County - 104 species
  3. Clark County - 114 species
  4. Barron County - 120 species
  5. Rusk County - 122 species
  6. Burnett County - 128 species
  7. Eau Claire County - 133 species
  8. Washburn County - 133 species
  9. Dunn County - 135 species
  10. Florence County - 140 species

Report created on October 25, 2014 at 11:13 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.