Invasive Species

  • are plants, animals and microbes that are non-native to a region 
  • arrive unacompanied by their native predators
  • out-compete native species for available resources
  • reproduce prolifically
  • dominate regions and ecosystems
  • can be difficult to control
  • have the potential to transform entire ecosystems
  • can cause damage costing about 5% of the global economy 

The longer we ignore the problem
the harder and more expensive the battle for control will become.

Globally, the estimated damage from invasive species totals more than $1.4 trillion, or five percent of the global economy. In the U.S., the estimated cost of invasives is at least $100 billion and up to $200 billion, with more than 100 million acres affected (i.e., about the size of California). 1, 2



Join us

People around the state are taking action against invasive species. Join them. Whether you’re a gardener or a boater, a hunter or a hiker, an angler or a pet owner, you can be part of a team by joining one of the hundreds of volunteer events going on around the state.


1 Pimentel, D., Zuniga, R., and D. Morrison. 2005. Update on the environmental and economic cost associated with alien-invasive species in the United States. Ecological Economics 52. pp 273-288.

2 OTA. 1993. Harmful non-indigenous species in the United States. Office of Technology and Assessment, United States Congress, Washington DC.