A Defining Moment for Hemp in America
On December 20, 2018, President Trump signed the Agriculture Improvement Act of 2018 into law. Among its many provisions, the bill contained a historic change: industrial hemp was removed from the Controlled Substances Act and reclassified as an agricultural commodity.
The law defines industrial hemp as the Cannabis sativa L. plant (and any part of the plant) with a delta-9 THC concentration of not more than 0.3% on a dry weight basis. This distinction separated hemp from marijuana under federal law for the first time since the Controlled Substances Act of 1970.
What the Farm Bill Actually Changed
Federal Legalization
Hemp cultivation, processing, and sale became legal at the federal level. States were authorized to create their own hemp regulatory programs, subject to USDA approval.
Crop Insurance and Banking
Hemp farmers gained access to federal crop insurance programs and USDA grants. Financial institutions could serve hemp businesses without the legal risks that previously accompanied cannabis-related enterprises.
Research Expansion
The bill expanded the scope of hemp research beyond the limited pilot programs authorized by the 2014 Farm Bill. Universities and research institutions could now study hemp cultivation, processing, and commercial applications without DEA oversight.
Interstate Commerce
Hemp and hemp-derived products — including CBD, fiber, and building materials — could be transported across state lines, enabling national supply chains.
Impact on Building Materials
The Farm Bill's most overlooked impact may be on construction. By legalizing industrial hemp, the law enabled domestic production of hemp hurd — the raw material used in hempcrete and hemp-lime composites like GaiaCrete®.
Before 2018, builders interested in hemp construction had to import hemp hurd from Europe or Canada, driving up costs and limiting availability. Today, American hemp farms can supply the building industry directly, supporting both domestic agriculture and sustainable construction.
The USDA reported that U.S. hemp acreage grew from virtually zero to over 128,000 licensed acres by 2019, though planted acreage has since stabilized as the market matures.
Why It Still Matters
The 2018 Farm Bill was a starting point, not an endpoint. Challenges remain — including building code adoption for hemp materials, inconsistent state regulations, and the need for more processing infrastructure. But the legal foundation is in place.
Christopher L. Penn's book Hemp Rising explores this landscape in depth — examining where the hemp industry has been, where it stands today, and where it's headed.