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Each year, Boise Goathead Fest celebrates celebrates the capital city's bicycling culture with a big gathering of cyclists in a downtown park. The goathead is the common name for the puncture vine, a pesky invasive weed that embeds in bike tires and causes many flats throughout the year. They're found in the Boise foothills, but goatheads can also wreak havoc on the Greenbelt and roads around the Treasure Valley.