California's Humboldt County is known for its towering redwoods. But this region about 200 miles north of San Francisco has another claim to fame. Humboldt is to weed what Napa is to fine wine — it's the heart of marijuana production in the U.S.
Every fall, young people, mostly in their 20s, come from all over the world to work the marijuana harvest. They come seeking jobs as "trimmers" — workers who manicure the buds to get them ready for market. The locals have a name for these young migrant workers: "trimmigrants."