The quiet beauty of Arches National Park hangs in a precarious balance. Researches hunt the serene landscape for one of the most dangerous threats to our environment - invasive species. In order to hold the intruders at bay, the National Parks Service has launched a major initiateve: To eradicate the exotic plant at the top of the West's most wanted list: Tamarisk or Salt Cedar. This marauding weed has infested over 3.3 million acres in our most fragile ecosystem - the riparian or stream-side area. Join the Exotic Plant Management Teams as they fight to stop this particularly ferocious invader before it spreads like a biological wildfire.