If you’ve spent any time researching hemp or CBD products, you’ve probably seen the terms hemp, cannabis, and marijuana used interchangeably. While they are closely related, they are not exactly the same thing. Understanding the difference between hemp and cannabis can help clarify how hemp-derived products work and why they are legally sold in many places.
Hemp and Cannabis Are the Same Species
From a scientific standpoint, hemp and cannabis come from the same plant family.
Both belong to the Cannabaceae family and the Cannabis genus. Most cultivated plants fall under the species Cannabis sativa, although the plant is often divided into several varieties or subspecies.
In other words, hemp and marijuana are not completely separate plants—they are simply different types of cannabis that have been bred for different purposes.
The key distinction between hemp and cannabis is the level of THC, or tetrahydrocannabinol.
THC Is The Main Difference
THC is the cannabinoid responsible for the intoxicating effects commonly associated with marijuana. Plants that contain high levels of THC are typically cultivated for recreational or medical cannabis use.
Hemp, on the other hand, contains very low concentrations of THC. In the United States and many other countries, hemp is legally defined as cannabis containing no more than 0.3% THC by dry weight.
Because hemp contains such small amounts of THC, it does not produce a psychoactive high. Instead, hemp plants are commonly used to produce products like:
- CBD extracts
- Hemp seed oil and food products
- Fibers for textiles and rope
- Industrial materials and bioplastics
This low THC level is the primary reason hemp products can be legally sold in many places where marijuana remains restricted.
Cannabis Varieties: Sativa, Indica, and Ruderalis
Cannabis plants are often grouped into three major varieties:
Cannabis Sativa
Cannabis sativa plants tend to grow tall and narrow with longer flowering cycles. Historically, these plants were native to warmer tropical regions such as parts of Asia, Africa, and Central America.
Many modern cannabis strains marketed in dispensaries trace their genetics back to sativa plants.
Cannabis Indica
Cannabis indica plants are generally shorter and bushier than sativa varieties. They originated in drier, mountainous regions such as India, Afghanistan, and parts of the Middle East.
Indica plants typically produce dense flowers and are widely used in modern cannabis breeding.
Cannabis Ruderalis
Cannabis ruderalis is a smaller, hardy plant that developed in harsher climates such as Eastern Europe and Russia. Ruderalis plants usually contain low levels of THC, and they are known for their ability to flower automatically based on age rather than light cycles.
Because of this trait, ruderalis genetics are commonly used in autoflower cannabis breeding.
Modern Cannabis Breeding Has Blurred the Lines
Although the terms sativa, indica, and ruderalis are widely used, modern cannabis breeding has made these distinctions much less clear than they once were.
Over many decades, growers have crossbred different cannabis varieties to combine desirable traits such as:
- growth speed
- cannabinoid production
- plant structure
- climate adaptability
As a result, many modern plants contain genetics from multiple cannabis varieties, making it difficult to categorize them strictly as one type or another.
Why Hemp Is Grown Differently
Unlike cannabis cultivated for THC production, hemp plants are usually bred for completely different purposes.
Depending on the variety, hemp may be grown for:
- CBD extraction
- fiber production
- hemp seeds and oils
- industrial uses
These plants are selected specifically for low THC content, which keeps them compliant with legal definitions of hemp while still producing useful compounds like CBD and other cannabinoids.
The Bottom Line
Hemp and cannabis come from the same plant species, but they are bred and cultivated for very different purposes.
The main distinction is THC content. Hemp contains 0.3% THC or less, meaning it does not produce a high and is commonly used to create CBD products and other industrial materials. Cannabis plants with higher THC levels are typically grown for recreational or medical marijuana.
Despite the common labels of sativa, indica, and ruderalis, modern breeding has blended many cannabis genetics together. Today, the most important difference between hemp and marijuana remains how the plant is cultivated and the cannabinoid levels it produces.