From the Vail Daily (Bob Berwyn):
Tamarisk, also known as salt cedar, was found a couple of years ago growing in a rock wall in Frisco. The plants were likely brought in during construction, said Lisa Taylor, director of Summit’s weed control program. The invasive plant has infested many areas in the lower Colorado River Basin, drinking millions of gallons of water that could otherwise be used for irrigation, municipalities or environmental purposes. A second tamarisk sprout was located near Silverthorne, Taylor said. The plant is difficult to eradicate when established, requiring heavy duty applications of herbicides and even burning. Taylor said the Summit County specimens are gone. It’s not clear how easily the plants spread in the higher-elevation cool climates, but Taylor doesn’t think tamarisk will be a major problem here. Keeping Summit County free of tamarisk is a high priority because of its impact on water resources.
Taylor said a couple of other non-native plants have made a spotty appearance in Summit County, including absinthe wormwood and sulphur cinquefoil, the latter in the Heaton Bay campground.