Experts want to combat new species of plants that are moving around within the United States, and coming from around the ...

Canada thistle. Canada thistle (Cirsium arvense), an invasive noxious weed from Europe and Asia, grows 2 to 4 feet tall and has oblong spiny leaves and clusters of 1 to 5 small, tubular flowers that ...

Non-native plants are those not originating in this country, but also those not native to a specific ecosystem.