Chemovars – Why the classification into Sativa and Indica is scientifically inaccurate

The Traditional Classification of Cannabis

Cannabis has traditionally been divided into three groups for decades:

• Cannabis sativa

• Cannabis indica

• Cannabis ruderalis

In common usage, these categories are often associated with specific effects. It is frequently assumed that:

• Sativa is more stimulating

• Indica is more calming

However, this classification was originally based on morphological differences between plants, not on their chemical composition.

“The classification of cannabis into Sativa and Indica types is based on morphological characteristics and not on chemical composition.”

Further details below

Morphological Differences

Historically, the following differences were described:

Cannabis sativa

• Taller plants

• Narrower leaves

• Longer flowering times

Cannabis indica

• More compact plants

• Broader leaves

• Shorter flowering times

These characteristics relate solely to the plant’s appearance and growth and do not allow reliable conclusions about chemical composition or effects.

Why This Classification Is Problematic Today

Due to decades of crossbreeding, many cannabis strains have been extensively hybridized, resulting in genetically mixed plants.

Genomic studies show that modern cannabis strains often do not exhibit clear genetic boundaries between Sativa and Indica.

“The commonly used labels ‘Indica’ and ‘Sativa’ are not supported by the genetic relationships among cannabis samples.”

Further details below

A genetic analysis of various commercial cannabis strains found that traditional categories do not reliably reflect the actual genetic relationships between plants.

The Concept of Chemovars

To describe cannabis more accurately, scientists increasingly use the term chemovar (chemical variety).

A chemovar describes a cannabis plant based on its chemical profile, particularly:

• its cannabinoid content

• its terpene content

This chemical profile plays a decisive role in determining the characteristics of a cannabis strain.

“Cannabis strains should be classified according to their chemical composition rather than traditional taxonomic labels.”

Further details below

The Main Chemovar Types

In research, cannabis is often classified based on its cannabinoid ratio:

Type I – THC-dominant

These plants produce predominantly THC and only small amounts of CBD.

Type II – Balanced ratio

These plants contain similar amounts of THC and CBD.

Type III – CBD-dominant

These plants produce predominantly CBD and only very small amounts of THC.

This classification is based on the plant’s actual chemical profile.

Relevance for Research and Medical Use

The chemical profile of a cannabis plant significantly influences its properties. In addition to cannabinoids, terpenes also play an important role.

Therefore, modern research increasingly focuses on:

• cannabinoid profiles

• terpene profiles

• plant genetics

These factors provide far more precise information than the traditional Sativa and Indica categories.