What's the difference between hemp and marijuana?
Hemp and marijuana are, taxonomically speaking, the same plant; they are different names for the same genus (Cannabis) and species.
"Hemp and marijuana even look and smell the same," says Tom Melton, deputy director of NC State Extension. "The difference is that hemp plants contain no more than 0.3 percent (by dry weight) of THC (tetrahydrocannabinol), the psychoactive substance found in marijuana. By comparison, marijuana typically contains 5 to 20 percent THC. You can't get high on hemp."
In other words, Cannabis plants with 0.3 percent or less of THC are hemp. Cannabis plants with more than 0.3 percent THC are marijuana.