What are the worst weeds?
Alaska--relatively weed free (but still invaded by species such as Alliaria petiolata (garlic mustard), this state's most pernicious invasive species are introduced animals.
Hawai'i--this state is beset by a vast array of invasives.
Canada--Many parts of Canada are infested with Lythrum salicaria
Other countries--see our developing section on invasives from other regions of the globe.
The most frequently asked questions answered for your edification.
Here we have PowerPoint presentations on invasive species. Web slideshow versions are also on line if you do not want to download the PowerPoint files.
It is difficult to put an accurate price tag on the costs of invasive species. Here are a few results from studies that have tried to do so.
People who talk about invasive species often present facts without citing their sources. Are you curious about our sources? Here they are for you!
Steps you can take to help us protect our own wealth of native biodiversity.
Other site resources
Species which are either new to an area, or are showing alarming symptoms such as signs of signicant, new expansion.
Read about how different people have had great successes dealing with invasive species.
Read our reviews of hardware that are useful for those working in invasive species management.
Information about the core staff of The Nature Conservancy's Global Invasive Species Team.
How you can contact the core staff of The Nature Conservancy's Global Invasive Species Team.