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Status of Invasive Plants in Maryland

Total number of exotic species reported: 446

Total number of records in EDDMapS: 8250


Invasive Plants by Category

  • Aquatic - 17 species, 220 records
  • Conifer Trees - 3 species, 9 records
  • Forbs/Herbs - 206 species, 2339 records
  • Grass or Grasslike - 75 species, 1312 records
  • Hardwood Trees - 49 species, 615 records
  • Shrub or Subshrub - 64 species, 1216 records
  • Vines - 29 species, 1061 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese stiltgrass - 370 reports
  2. tree-of-heaven - 325 reports
  3. wavyleaf basketgrass - 318 reports
  4. Japanese honeysuckle - 302 reports
  5. multiflora rose - 301 reports
  6. Japanese barberry - 272 reports
  7. garlic mustard - 253 reports
  8. mile-a-minute vine - 253 reports
  9. wine raspberry - 187 reports
  10. Japanese hop - 137 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. buckhorn plantain - 21/24 (88%)
  5. Asiatic dayflower - 21/24 (88%)
  6. red sorrel - 20/24 (83%)
  7. curly dock - 20/24 (83%)
  8. multiflora rose - 20/24 (83%)
  9. Japanese honeysuckle - 20/24 (83%)
  10. bald brome - 20/24 (83%)

Counties with the most invasive species reported

  1. Prince George's County - 368 species
  2. Montgomery County - 334 species
  3. Baltimore County - 275 species
  4. Calvert County - 222 species
  5. Howard County - 219 species
  6. Frederick County - 218 species
  7. Cecil County - 212 species
  8. Anne Arundel County - 206 species
  9. Worcester County - 185 species
  10. Washington County - 167 species

Counties with the least invasive species reported

  1. Somerset County - 47 species
  2. Baltimore city - 55 species
  3. Queen Anne's County - 69 species
  4. Dorchester County - 82 species
  5. St. Mary's County - 87 species
  6. Wicomico County - 88 species
  7. Charles County - 102 species
  8. Carroll County - 106 species
  9. Harford County - 113 species
  10. Kent County - 119 species

Report created on August 31, 2015 at 06:51 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.