How weeds hitchhike across the country

By Sarah Zielinski, 10:29 AM November 25, 2013

Before you head off for that Thanksgiving trip to grandma’s house, you might want to wash your car. It seems our vehicles are inadvertently transporting hundreds of millions of plant seeds from place to place, many of which will grow up to be weeds or invasive species.

That cars can move seeds around has been known for a while. Seeds have been found underneath the car’s chassis, trapped in the front and rear bumpers and tucked away in wheel wells and arches, as well as on tires, mudguards and ...

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