Many people love to buy new species of plants to add something new to their garden but have no idea that they could be introducing an invasive species to their landscape. One of the most common ways of introducing invasive species to your yard is by purchasing firewood. An unsuspecting homeowner can very well introduce such species as the emerald ash borer, Agrilus planipennis, which has been devastating the ash tree population of North America. This is now a major crisis in the Eastern United States and Canada, as 15-20% of the tree population is ash, genus: Fraxinus spp. (baseball bats are made from ash).