![Hemp is the same species as marijuana (Cannabis sativa), and the only difference is a legal one: Plants with less than 0.3% of the chemical that gives users a “high”— tetrahydrocannabinol, or THC — are hemp, and anything over 0.3% THC is marijuana.](https://secure.caes.uga.edu/news/multimedia/images/6215/hemp-greenhouse-web.jpg)
Hemp Genetics
When you buy something at the store, you have a pretty good idea of what you’re getting no matter where you buy it — a Coke is a Coke, Oreos are Oreos — and whether you buy them in Atlanta or Seattle doesn’t really change what you get. Farmers are in a similar position when they choose what to plant, but in the burgeoning field of industrial hemp, it turns out that things are much more complicated.