The cultivation of industrial cannabis has been illegal in the United States since 1970 because the industrial plant and marijuana were considered the same when in fact different varieties of cannabis. In recent years, some states have changed their laws, allowing farmers to start cultivating industrial cannabis, which is used in everything from clothes to food products to building materials. Oregon cultivator Cliff Thomason says that cannabis cultivation and processing has been confused because it was illegal, but now a knowledge base for best uses can be developed along with plants. See a hemp house built with gravel, a building material that claims to be mold-resistant, breathable and eco-friendly.
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Can you build a home with hemp? | National Geographic