Why are callery pears considered invasive?

Bradford Pear Bounty sponsored by Clemson Extension, South carolina forestry commission and the city of Clemson

An invasive species has three main characteristics:

  • They are not naturally from the area in which they’re now present
  • They create economic or ecological damage
  • They displace native species

Generally speaking, invasive species grow quite rapidly and thrive in many different conditions (e.g. shade, sun, dry, wet, poor soils, hillsides, disturbed areas). A large number of invasive-exotic vegetative species are heavy seed producers (or produce seed in abundance).

While invasive species may provide shelter for wildlife (e.g. bird nests) they do not provide much food – especially for birds that eat insects – because very few insects eat the leaves of invasive species.