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Status of Invasive Plants in Maryland

Total number of exotic species reported: 447

Total number of records in EDDMapS: 7548


Invasive Plants by Category

  • Aquatic - 17 species, 221 records
  • Conifer Trees - 3 species, 9 records
  • Forbs/Herbs - 210 species, 2348 records
  • Grass or Grasslike - 74 species, 1221 records
  • Hardwood Trees - 49 species, 600 records
  • Shrub or Subshrub - 65 species, 1128 records
  • Vines - 28 species, 1008 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. tree-of-heaven - 320 reports
  2. Japanese stiltgrass - 302 reports
  3. wavyleaf basketgrass - 298 reports
  4. multiflora rose - 295 reports
  5. Japanese honeysuckle - 287 reports
  6. mile-a-minute vine - 245 reports
  7. Japanese barberry - 241 reports
  8. garlic mustard - 230 reports
  9. wine raspberry - 160 reports
  10. Japanese hop - 128 reports

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

  1. Japanese stiltgrass - 22/24 (92%)
  2. mile-a-minute vine - 22/24 (92%)
  3. Canada bluegrass - 22/24 (92%)
  4. Asiatic dayflower - 21/24 (88%)
  5. buckhorn plantain - 21/24 (88%)
  6. Japanese honeysuckle - 20/24 (83%)
  7. multiflora rose - 20/24 (83%)
  8. bald brome - 20/24 (83%)
  9. red sorrel - 20/24 (83%)
  10. curly dock - 20/24 (83%)

Counties with the most invasive species reported

  1. Prince George's County - 357 species
  2. Montgomery County - 323 species
  3. Baltimore County - 258 species
  4. Calvert County - 218 species
  5. Frederick County - 209 species
  6. Howard County - 209 species
  7. Cecil County - 206 species
  8. Anne Arundel County - 198 species
  9. Worcester County - 181 species
  10. Washington County - 155 species

Counties with the least invasive species reported

  1. Somerset County - 43 species
  2. Baltimore city - 45 species
  3. Queen Anne's County - 61 species
  4. Dorchester County - 77 species
  5. St. Mary's County - 82 species
  6. Wicomico County - 83 species
  7. Charles County - 95 species
  8. Carroll County - 99 species
  9. Harford County - 106 species
  10. Kent County - 115 species

Report created on September 2, 2014 at 12:50 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.