Status of Invasive Plants in Pennsylvania

Total number of exotic species reported: 668

Total number of records in EDDMapS: 36205


Invasive Plants by Category

  • Aquatic - 19 species, 1305 records
  • Conifer Trees - 5 species, 94 records
  • Forbs/Herbs - 369 species, 17469 records
  • Grass or Grasslike - 84 species, 4333 records
  • Hardwood Trees - 55 species, 1607 records
  • Shrub or Subshrub - 76 species, 3306 records
  • Vines - 45 species, 2080 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese stiltgrass - 732 reports
  2. multiflora rose - 568 reports
  3. Japanese barberry - 406 reports
  4. garlic mustard - 305 reports
  5. watercress - 287 reports
  6. Japanese honeysuckle - 273 reports
  7. oriental bittersweet - 255 reports
  8. wine raspberry - 215 reports
  9. redtop - 201 reports
  10. big chickweed - 198 reports

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

  1. bush honeysuckles (exotic) - 67/67 (100%)
  2. common yarrow - 67/67 (100%)
  3. yellow toadflax - 67/67 (100%)
  4. common St. Johnswort - 67/67 (100%)
  5. common ragweed - 67/67 (100%)
  6. hedge bindweed - 67/67 (100%)
  7. lambsquarters - 67/67 (100%)
  8. Queen Anne's lace, wild carrot - 67/67 (100%)
  9. hairy galinsoga - 67/67 (100%)
  10. common velvetgrass - 67/67 (100%)

Counties with the most invasive species reported

  1. Philadelphia County - 597 species
  2. Bucks County - 529 species
  3. Montgomery County - 513 species
  4. Allegheny County - 510 species
  5. Northampton County - 492 species
  6. Lehigh County - 487 species
  7. Berks County - 486 species
  8. Delaware County - 453 species
  9. Chester County - 448 species
  10. Lancaster County - 425 species

Counties with the least invasive species reported

  1. Cameron County - 151 species
  2. Jefferson County - 161 species
  3. Clarion County - 162 species
  4. Montour County - 166 species
  5. Columbia County - 167 species
  6. Sullivan County - 169 species
  7. Indiana County - 173 species
  8. Forest County - 177 species
  9. Union County - 184 species
  10. Wyoming County - 190 species

Report created on April 17, 2014 at 05:26 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.



Bugwood Center Developed by The University of Georgia - Center for Invasive Species and Ecosystem Health.
Last updated on Tuesday, December 04, 2012 at 08:59 AM