A Beginner's Guide to Cannabis Terpenes

What Are Terpenes?

Terpenes are organic compounds produced by a wide variety of plants — not just cannabis. They are responsible for the scent of pine trees, the flavour of citrus peel, the calming aroma of lavender, and the peppery bite of black pepper. In nature, terpenes serve multiple functions: they can attract pollinators, repel pests, and protect the plant from environmental stress.

In cannabis, terpenes are produced in the same glandular trichomes that generate cannabinoids like THC and CBD. There are over 150 known terpenes in cannabis, though a smaller number appear consistently at meaningful concentrations. These compounds are the reason different cannabis strains can smell so dramatically different — from fuel and earth to citrus and candy — even when their THC content is identical.

Importantly, terpenes are volatile compounds, meaning they evaporate easily at room temperature. This is why proper storage matters: cannabis left in an open bag will lose terpenes — and therefore aroma and flavour — over time. If your cannabis has lost its smell, it has almost certainly lost a significant portion of its terpene content.

The Entourage Effect

One of the most important concepts in understanding cannabis is the entourage effect — the idea that cannabinoids and terpenes work together synergistically, producing an overall effect that is different from (and often greater than) what any single compound would produce on its own.

In practice, this means a strain with 20% THC and a rich terpene profile may feel very different from a strain with the same THC content but a poor or degraded terpene profile. The terpenes modulate how the cannabinoids interact with the body. Myrcene, for example, is thought to increase the permeability of cell membranes, potentially allowing cannabinoids to be absorbed more readily. Limonene appears to influence serotonin and dopamine signalling in ways that can alter the subjective experience.

The entourage effect is also why isolated THC products — distillates that have been stripped of terpenes — are often reported to produce a flatter, less satisfying experience than full-spectrum extracts or flower, even when the THC dose is higher. The compounds work better together. Our indica vs sativa guide explores how the entourage effect challenges the traditional indica/sativa classification system.

The Seven Major Cannabis Terpenes

1. Myrcene

Aroma: Earthy, musky, clove, herbal.
Also found in: Hops, thyme, lemongrass, mangoes.
In cannabis: Myrcene is the most abundant terpene in modern cannabis, often comprising over 50% of a strain's total terpene content. It is most strongly associated with the "couch-lock" sensation — the heavy, body-focused relaxation that consumers frequently report from myrcene-rich cultivars. Strains high in myrcene include Granddaddy Purple, Northern Lights, and Blueberry. The Kush family is generally myrcene-dominant.

2. Limonene

Aroma: Citrus, lemon, orange, fresh.
Also found in: Citrus fruit rinds, juniper, rosemary.
In cannabis: Limonene is the second most common cannabis terpene and is associated with elevated mood and stress relief in consumer reports. It appears prominently in strains with "lemon," "orange," or "citrus" in their names — though the presence of those words does not always indicate high limonene content. Key limonene-rich strains in the archive include Super Lemon Haze, Mimosa, and Wedding Cake. Browse the flavours directory for citrus-forward cultivars.

3. Pinene

Aroma: Pine, fir, rosemary, fresh forest.
Also found in: Pine needles, rosemary, basil, dill.
In cannabis: Pinene exists in two forms — alpha-pinene and beta-pinene — both of which appear in cannabis. It is associated with alertness and focus in consumer reports, and it is the terpene most responsible for the classic "pine" aroma found in many traditional strains. High-pinene cultivars include Jack Herer, Blue Dream, and Chemdawg. The Haze family often carries significant pinene.

4. Caryophyllene

Aroma: Peppery, spicy, woody, clove.
Also found in: Black pepper, cloves, cinnamon.
In cannabis: Caryophyllene is unique amongst common cannabis terpenes because it can interact directly with the body's endocannabinoid system — specifically the CB2 receptor — making it both a terpene and a dietary cannabinoid. It is abundant in many modern hybrids and contributes to the "spicy" notes in strains like Girl Scout Cookies, Bubba Kush, and GMO. The Cookies family tends to be rich in caryophyllene.

5. Linalool

Aroma: Floral, lavender, sweet, herbal.
Also found in: Lavender, rosewood, birch, coriander.
In cannabis: Linalool is the terpene that gives lavender its characteristic calming scent, and it appears in many cannabis strains that consumers describe as soothing or relaxing. It is rarely the dominant terpene but appears as a supporting note in cultivars like Lavender, Do-Si-Dos, and Amnesia Haze. For strains rich in linalool and other relaxing terpenes, see our evening strains guide.

6. Humulene

Aroma: Woody, earthy, hoppy, herbal.
Also found in: Hops, sage, ginseng, coriander.
In cannabis: Humulene is the terpene that gives hops their characteristic aroma — fitting, given that hops and cannabis are botanical cousins within the Cannabaceae family. It often appears alongside myrcene and caryophyllene and contributes to the earthy, woody character of strains like Death Star, White Widow, and Girl Scout Cookies.

7. Terpinolene

Aroma: Herbal, floral, piney, with a hint of citrus.
Also found in: Lilac, nutmeg, cumin, tea tree.
In cannabis: Terpinolene is less common as a dominant terpene but appears as a significant component in several popular sativa-leaning strains, where it contributes a complex, multi-layered aroma. It is prominent in Jack Herer, Durban Poison, and Golden Goat. It often accompanies pinene and limonene in hazey, uplifting cultivars.

How to Use Terpene Knowledge When Choosing a Strain

Understanding terpenes shifts the conversation away from "indica or sativa?" and towards "what aromas and effects do you enjoy?" If you know that strains with prominent limonene tend to produce experiences you appreciate, you can seek out other limonene-rich cultivars — regardless of whether they are labelled indica, sativa, or hybrid.

On Strains.cc, the flavours directory and the effects directory are designed to help you browse by these characteristics. Each strain profile documents the reported aroma profile, and where multiple examples exist, you can see how terpene expression varies between different batches and growing conditions.

A practical approach for the UK consumer: start by paying attention to the aroma of what you already enjoy. The smell of cannabis is its terpene profile made manifest. If you consistently like the smell of peppery, gassy strains, you are likely responding to caryophyllene and myrcene — and you can use that knowledge to find similar cultivars. If you gravitate towards citrusy, uplifting aromas, limonene and terpinolene are your guide. The full strain archive lets you search and browse by these characteristics.

For a deeper dive into how growing conditions and curing affect terpene preservation, our photography behind-the-scenes article touches on how the archive documents batch variation — and why the same strain can look (and smell) so different from one grower to the next.

Frequently Asked Questions

Are terpenes psychoactive?

Terpenes are not psychoactive in the way that THC is — they do not produce a "high" on their own. However, they are biologically active compounds that can influence mood, alertness, and the overall subjective experience through the entourage effect. Limonene, for example, is associated with elevated mood in consumer reports. The entourage effect describes how terpenes modulate the experience of cannabinoids rather than producing effects independently.

Do all cannabis strains contain the same terpenes?

No. While many terpenes appear across a wide range of strains, their concentrations vary enormously. A strain like Sour Diesel is typically dominant in limonene and caryophyllene, whilst Granddaddy Purple is myrcene-heavy. Some terpenes, like terpinolene, are abundant in only a subset of cultivars. The unique terpene profile of each strain is what gives it its distinctive character.

How can I tell what terpenes are in a strain?

In legal markets, laboratory certificates (often called certificates of analysis or COAs) list terpene content alongside cannabinoid figures. In the UK informal market, this data is rarely available, so consumers rely on sensory evaluation: the aroma of the flower is a direct indication of its terpene content. The archive documents reported aromas for each strain profile, giving you a reference point even without lab data.

Do terpenes degrade over time?

Yes. Terpenes are volatile compounds that evaporate at room temperature, especially when exposed to air, light, or heat. Improperly stored cannabis will lose its aroma as terpenes degrade. This is one reason proper curing and storage — in airtight containers, away from direct light, at cool temperatures — is so important for preserving quality. A strain that smells muted has almost certainly lost terpenes.

Are there terpene profiles unique to certain strain families?

Some strain families do have characteristic terpene patterns. The Kush family tends to be myrcene-dominant with supporting notes of pinene and caryophyllene. The Haze family often features terpinolene alongside pinene and limonene. The Cheese family has a unique caryophyllene-and-myrcene profile that contributes to its savoury character. These patterns are tendencies, not absolutes, but they can be useful guides when exploring related cultivars.

Can terpenes help me choose between two strains with similar THC?

This is arguably the most practical application of terpene knowledge. If you are choosing between two strains both tested around 20% THC, the terpene profile is what will differentiate them. A myrcene-dominant strain will likely produce a more physically relaxing experience; a limonene-dominant strain may feel more uplifting. Understanding terpenes gives you a more nuanced vocabulary for describing — and selecting — cannabis. Our indica vs sativa guide covers this in the context of the UK market.