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Status of Invasive Plants in Pennsylvania

Total number of exotic species reported: 668

Total number of records in EDDMapS: 38355


Invasive Plants by Category

  • Aquatic - 19 species, 1346 records
  • Conifer Trees - 5 species, 94 records
  • Forbs/Herbs - 374 species, 18974 records
  • Grass or Grasslike - 92 species, 4609 records
  • Hardwood Trees - 56 species, 1659 records
  • Shrub or Subshrub - 76 species, 3413 records
  • Vines - 45 species, 2143 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese stiltgrass - 741 reports
  2. spiny plumeless thistle - 733 reports
  3. multiflora rose - 607 reports
  4. musk thistle - 453 reports
  5. Japanese barberry - 424 reports
  6. garlic mustard - 332 reports
  7. Japanese honeysuckle - 294 reports
  8. watercress - 287 reports
  9. oriental bittersweet - 263 reports
  10. wine raspberry - 215 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 - 600 species
  2. Bucks County - 532 species
  3. Montgomery County - 518 species
  4. Allegheny County - 514 species
  5. Northampton County - 494 species
  6. Berks County - 492 species
  7. Lehigh County - 489 species
  8. Delaware County - 457 species
  9. Chester County - 453 species
  10. Lancaster County - 431 species

Counties with the least invasive species reported

  1. Cameron County - 159 species
  2. Jefferson County - 170 species
  3. Clarion County - 172 species
  4. Montour County - 174 species
  5. Columbia County - 177 species
  6. Sullivan County - 179 species
  7. Indiana County - 189 species
  8. Union County - 193 species
  9. Forest County - 194 species
  10. Wyoming County - 199 species

Report created on September 22, 2014 at 08:12 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.