What Does Weed Look Like?
Check out the image below. What you're looking at is a pretty straighforward light deprivation setup. You'll see a lot of these on Weed or No Weed.
Growers use these temporary greenhouses to control the amount of sunlight their plants are receiving. If you cut back on the amount of light the plant receives, you can force it to flower earlier.
Can you grow something besides weed in a light dep structure? Theoretically. But remember that we are in Humboldt County.