Hemp vs. marijuana trips up a lot of shoppers, and for good reason: they're the same plant species. What separates them is mostly a number in the law, the amount of THC the plant contains, along with how each is bred and used. Here's how the two compare, and what Michigan allows as of October 2026.
Same species, different legal definitions
Hemp and marijuana are both Cannabis sativa L. While they're growing, the two can look and smell much the same. As a University of Kentucky extension guide points out, THC content is the line the law draws between them, not species.
Breeding explains the rest. Hemp varieties are grown for fiber, seed or CBD, and they keep THC low. Marijuana varieties are bred for flower rich in THC. The result is two crops from one species, with very different uses and very different rules.
Hemp vs. marijuana at a glance
| Hemp | Marijuana | |
|---|---|---|
| Species | Cannabis sativa L. | Cannabis sativa L. |
| THC | 0.3% or less (Michigan counts THCA) | More than 0.3% |
| Usually bred for | Fiber, seed or CBD-rich flower | THC-rich flower |
| Common products | Textiles, building materials, hemp hearts, seed oil, CBD products | Flower, vapes, edibles, concentrates and pre-rolls |
| Michigan oversight | Growers register with the state agriculture department; processing is licensed by the CRA | Businesses licensed by the CRA |
The THC line: how the law defines hemp
Since the 2018 Farm Bill, federal law has defined hemp as the cannabis plant and any part of it, including seeds, extracts and derivatives. The catch is THC: delta-9 THC has to stay at 0.3% or less, measured by dry weight. Cannabis above that line is marijuana.
That definition counted only delta-9. It left room for flower high in THCA, which becomes delta-9 when heated, and for intoxicating compounds such as delta-8 made from hemp CBD.
The federal change. In November 2025, Congress passed a narrower definition. It counts total THC including THCA, excludes products with cannabinoids the plant can't naturally produce or that were made outside the plant, and rules out finished products with more than 0.4 mg of total THC per container. As of October 2026, it is set to take effect in late 2026, and our hemp ban explainer covers the details.
Michigan's line. Under Michigan law, cannabis with more than 0.3% THC, counting THCA, is marijuana that only licensed marijuana businesses may sell. At 0.3% or less, it's industrial hemp.
Composition: cannabinoid and terpene differences
Hemp and marijuana make the same families of compounds. The difference is in the amounts:
- THC: marijuana is bred for high THC, while hemp has to stay at or below the legal line.
- CBD: many hemp varieties are bred for CBD, and some marijuana strains carry meaningful CBD too.
- Other cannabinoids: both can produce smaller amounts of CBG, CBN and others.
- Terpenes: both make aromatic terpenes, and the profile depends on genetics rather than the legal category.
In both plants, cannabinoids are concentrated in the female flowers. Stems, leaves and roots carry far less, and the seeds carry no significant amount. Our guides to CBD vs. THC and what cannabinoids are go deeper.
A short history of hemp in America and Michigan
Hemp was once an ordinary farm crop. In Kentucky, for example, it was common on farms in the late 1700s and 1800s, grown mainly for fiber used in rope and cloth.
- 1937: the Marihuana Tax Act made hemp impractical to grow, as new taxes and licensing ended most large-scale production.
- World War II: the federal Hemp for Victory campaign asked farmers to grow hemp for fiber for the war effort, a brief revival.
- After the war: production faded, and federal drug law later treated all cannabis, hemp included, as a controlled substance.
- 2014: the Farm Bill allowed hemp pilot research programs run by state agriculture departments or universities.
- 2018: the Farm Bill created today's federal definition of hemp.
- Michigan, 2021 and 2022: the state began regulating delta-8 THC as marijuana on October 11, 2021, and in February 2022 the governor signed an order moving oversight of hemp processing to the Cannabis Regulatory Agency.
Uses: fiber, seed and CBD vs. adult-use and medical products
Hemp's uses are mostly industrial and nutritional:
- Fiber for textiles and rope, plus newer materials such as hempcrete and composites.
- Seed for hemp hearts, seed oil, flour and protein, and in Europe for bird and livestock feed.
- Flower and extracts for CBD products.
Marijuana's uses center on its cannabinoids. Adult-use and medical products such as flower, edibles, vapes, concentrates and pre-rolls are sold in Michigan through licensed stores. Adults 21 and older can buy them, as can medical patients 18 and older with a card.
Hemp-derived CBD vs. dispensary CBD
The CBD molecule is identical whether it comes from hemp or marijuana. What differs is everything around it:
- THC content: hemp-derived products are built around the low-THC limit, while dispensary products can pair CBD with meaningful THC, as in a 1:1 ratio.
- Other compounds: extracts carry different mixes of minor cannabinoids and terpenes depending on the plant.
- Licensing: marijuana products move through Michigan's licensed marijuana businesses, while hemp processing runs under a separate CRA license.
At High Society, products come from trusted vendors and have passed Michigan's testing standards.
Hemp seed oil vs. cannabis oil: not the same thing
These names get mixed up all the time, but they describe different products.
| Product | Made from | Cannabinoids |
|---|---|---|
| Hemp seed oil | Pressed hemp seeds | No significant amount; it's a food and skincare oil |
| CBD oil | An extract of hemp or cannabis flowers in a carrier oil | CBD, with little or more THC depending on the source |
| Cannabis oil | An extract of marijuana flower in a carrier oil | THC, sometimes with CBD |
If a label says hemp seed oil, or lists Cannabis sativa seed oil as an ingredient, don't expect CBD or THC. For cannabinoids, look for the milligrams of CBD or THC on the package.
What's legal where: federal rules and Michigan's approach
Here's where things stand as of October 2026:
- Federal: hemp is defined by its delta-9 THC content until the narrower definition takes effect, which is set for late 2026.
- Michigan hemp: growers register with the Michigan Department of Agriculture and Rural Development, and processing hemp requires a license from the Cannabis Regulatory Agency.
- Michigan marijuana: anything above 0.3% THC, counting THCA, is marijuana, and only licensed marijuana businesses may sell it. Delta-8 THC has been regulated as marijuana since October 11, 2021, with no more than 10% delta-8 in licensed products.
- Buying: adults 21 and older can shop at licensed stores like High Society, and adults 18 and older with a medical marijuana card can also buy.
Wherever you buy, don't travel across state lines with cannabis. For the full picture, see our guide to Michigan cannabis laws. Our types of THC guide explains where delta-8, THCA and the other forms fit.
