Hemp vs Marijuana: What's the Difference?

Hemp and marijuana are not different plants. They are both Cannabis sativa L., separated only by a legal line: cannabis with 0.3% or less Delta-9 THC by dry weight is hemp, and anything above that threshold is marijuana. That single number, set by the 2018 Farm Bill, is the entire legal distinction.

Hemp vs marijuana: the legal distinction

The hemp vs marijuana question is, at its core, a legal one rather than a botanical one. Under federal law, the dividing line is the concentration of Delta-9 THC measured by dry weight. If a cannabis plant or product contains 0.3% Delta-9 THC or less, it is classified as hemp and is federally legal. If it exceeds 0.3%, it is classified as marijuana and remains a federally controlled substance.

This means the same plant, grown from the same genetics, can legally be hemp or marijuana depending entirely on how much Delta-9 THC it produces. The 0.3% figure is a regulatory cutoff, not a biological boundary, which is why the two terms describe a legal status rather than two separate species.

The same plant species

Botanically, hemp and marijuana are the same species: Cannabis sativa L. They share the same basic structure, the same family of cannabinoids, and the same general appearance, though cultivars are bred for very different purposes. Hemp varieties are often grown tall for fiber and seed or selected for high CBD and low THC, while marijuana cultivars are bred to maximize THC.

Because they are the same species, you cannot reliably tell hemp from marijuana just by looking at a plant. The only way to know which legal category a plant falls into is to test it in a lab and measure its Delta-9 THC content against the 0.3% threshold.

Cannabinoid content

Both hemp and marijuana produce the full range of cannabis cannabinoids, including Delta-9 THC, CBD, CBG, CBN, and many others. The difference is in the ratios. Marijuana cultivars are bred to concentrate Delta-9 THC, often well into the double digits by percentage. Hemp, by definition, keeps Delta-9 THC at or below 0.3% by dry weight.

Hemp can still be rich in other cannabinoids and can be processed to concentrate compounds that remain compliant. This is the foundation of the modern hemp-derived THC market: products are made from compliant hemp and formulated so that, on a dry-weight basis, they meet the federal Delta-9 limit. Every reputable product should come with third-party lab testing to verify its cannabinoid content.

The 2018 Farm Bill

The Agriculture Improvement Act of 2018, commonly called the 2018 Farm Bill, is the law that created this framework. It removed hemp, defined as cannabis with no more than 0.3% Delta-9 THC by dry weight, from the federal Controlled Substances Act. In doing so, it legalized hemp and hemp-derived products at the federal level and handed regulatory oversight to the USDA and the states.

This is why hemp-derived products can ship across the country in a way marijuana cannot. The Farm Bill drew a clear federal line around the 0.3% threshold, and everything that stays under it is treated as an agricultural commodity rather than a controlled substance. The FDA continues to regulate certain product claims and ingredients, which is why responsible sellers avoid making health or medical claims.

Why hemp-derived THC is federally distinct

Because the Farm Bill defines hemp by its Delta-9 THC concentration rather than by its source plant, hemp-derived THC products occupy a distinct federal category. Products like THCA flower, Delta-9 gummies, disposables, and cartridges can be made from compliant hemp and remain federally legal as long as they stay at or below the 0.3% Delta-9 dry-weight limit and are derived from hemp.

This federal distinction is what allows a nationwide wholesale market to exist. Marijuana remains tied to state-licensed programs and cannot cross state lines, while compliant hemp-derived products move under federal law. That said, the framework is specific and detail-driven, and compliance depends on accurate lab testing and careful formulation.

State variation and compliance

Federal legality is only half the picture. States retain the authority to regulate, restrict, or ban hemp-derived THC products within their borders, and many have done exactly that. Some states limit specific cannabinoids, cap THC per serving, require special licensing, or restrict certain product formats entirely. A product that is federally compliant may still be limited or prohibited in a given state.

Puff Puff Depot supplies Farm Bill-compliant, hemp-derived THC products wholesale to licensed retailers nationwide. Because state rules vary and change often, always confirm the regulations where you operate, sell only to customers 21 and older, and keep Certificates of Analysis on file. Staying current on your state's law is the single most important step in selling these products responsibly.