Invasion of the Invasives

Living on Earth
The World

Buffelgrass, a non-native grass, is spreading like wildfire through Saguaro National Park in Tucson, Arizona, threatening the park’s signature cacti and posing a fire threat to homes near the mountains. Jim Williams of station KUNM reports that scientists and volunteers are whacking away, trying to keep ahead of the relentless plant. (7:30)

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