Why is common ragweed a problem? Common ragweed is an extreme weed — thriving in extreme environments and making a home for itself in every state, except Alaska. Common ragweed has shown resistance to ...

BUFFALO, N.Y. — International commerce fuels global economies and keeps the world running. But along with that trade from country to country, comes a different kind of exchange. Invasive species in ...

The common ragweed plant (Ambrosia artemisiifolia) has spread rapidly in Europe and has intensified the pollen season for many allergy sufferers. Now the plant has arrived in Norway. Common ragweed ...