Puncture vine, the noxious weed that produces the notorious "goat heads" that routinely flatten bicyclists' tires in Ada County, can do even more harm to sheep, cattle, hay and crops, Ada County warns. The county is calling on residents to find puncture vine on their property and pull it before it begins producing seeds and the sharp burrs that contain them. The county also advises that after pulling the weeds, dropped burrs can be removed by sweeping or raking the ground, then patting the ground with a piece of carpet to collect the burrs; they and the plants should then be placed in a plastic bag in the trash. Read the county's full warning here, which calls the plant "flat-out noxious" and "one of the most annoying of toxic weeds."