Cannabis Terpenes Guide: Aromas, Flavors and How to Read Them on a Label

Open a jar of cannabis and the first thing you notice is the smell. It might be sharp citrus, earthy musk, pine, or something peppery and dark. That's terpenes. They're the most useful clue you have to what sets one product apart from another, and they're mostly left out of the THC-first way cannabis gets sold.

This guide covers what terpenes are, the ones you'll see most on lab reports, the aromas they're usually described as having, and how Massachusetts handles them on labels. It's for adults 21 and over.

One note before we start: we describe terpenes by aroma and flavor. People commonly report different experiences with different profiles, but we don't make effect or health claims. You shouldn't trust anyone who does without good evidence.

Key takeaways

• Terpenes are aromatic compounds that shape how cannabis smells and tastes.
• The ones you'll see most on lab reports are myrcene, limonene, beta-caryophyllene, alpha-pinene, linalool, humulene and terpinolene.
• They're usually reported as a percentage or in mg/g, and totals vary widely from product to product.
• Massachusetts doesn't require terpene testing for flower, but concentrate and vape labels must disclose added terpenes and their source.
• Terpenes are volatile. Heat, light and air wear them down, so storage matters.

What terpenes are

Terpenes are a large family of aromatic compounds made by plants. They're responsible for the smell of pine needles, citrus peel, lavender and hops. Cannabis produces them in the same resin glands (trichomes) that produce cannabinoids like THC and CBD.

Each cultivar has its own mix. That's why two flowers with nearly the same THC percentage can smell completely different. Technically, some of the compounds on a report are terpenoids, meaning terpenes that have been chemically modified, such as by oxidation. On a menu, "terpenes" covers both.

How terpenes show up on a lab report

When a producer has terpenes tested, the certificate of analysis lists each one with a result, usually as a percentage by weight or mg per gram. Many reports also include a total terpenes figure.

A few reading tips:

• Look at the top two or three. The dominant terpenes drive most of the aroma.
• Totals vary a lot. They differ from cultivar to cultivar and batch to batch, and concentrates can differ again depending on the process.
• "ND" means not detected. It doesn't mean the terpene is completely absent, only that it's below what the lab can measure.

For the rest of the report, see how to read a cannabis certificate of analysis.

The common cannabis terpenes

Here are the terpenes you'll see most on Massachusetts lab reports, with the aromas they're commonly described as having and where else you'll find them.

Myrcene

• Aroma: earthy, musky, herbal, sometimes described as ripe fruit or clove.
• Also found in: hops, lemongrass, bay leaves.
• Notes: often the most abundant terpene in cannabis.

Limonene

• Aroma: bright citrus, like lemon, orange or grapefruit peel.
• Also found in: citrus rinds, which is where most commercial limonene comes from.
• Notes: dominant in many strains with "lemon" or "orange" in the name, though names are unreliable.

Beta-caryophyllene

• Aroma: peppery, spicy, woody.
• Also found in: black pepper, cloves, cinnamon.
• Notes: gives many strains described as "gassy" or "spicy" their bite.

Alpha-pinene (and beta-pinene)

• Aroma: pine forest, fresh and sharp.
• Also found in: pine needles, rosemary, basil.
• Notes: one of the most widespread terpenes in the plant world.

Linalool

• Aroma: floral and lavender-like, a little spicy.
• Also found in: lavender, coriander, birch.
• Notes: usually present in smaller amounts, but you can pick it out.

Humulene

• Aroma: earthy, woody, herbal. It's the "hoppy" note in beer.
• Also found in: hops, sage, ginseng.
• Notes: frequently appears alongside caryophyllene.

Terpinolene

• Aroma: complex, fresh and slightly floral, with herbal, piney and citrus notes together.
• Also found in: lilac, tea tree, nutmeg, apples.
• Notes: less common as the dominant terpene, which makes profiles led by it easy to spot.

Others you might see

Ocimene (sweet, herbal), bisabolol (soft, floral), nerolidol (woody, floral) and eucalyptol (cool, minty) show up in smaller amounts on many reports.

Terpenes across product types

• Flower and pre-rolls carry whatever terpenes the plant produced and survived drying, curing and storage.
• Live resin and live rosin start from fresh-frozen plants, largely to preserve more of the original aroma.
• Distillate loses most of its original terpenes during refining. Terpenes are often added back, and the vape label tells you their source.
• Edibles usually taste like their other ingredients. Terpenes play a small role, if any.

How Massachusetts handles terpenes on labels

Flower: Terpene testing isn't required. The label has to show the full cannabinoid profile and the tested-with-no-adverse-findings statement, but terpenes are optional. Many producers test and list them anyway.

Concentrates and extracts: The label's ingredient list must include "the amount of specific additives infused or incorporated during the manufacturing process," which the regulation says includes specific terpenes, stated in absolute terms and as a percentage of volume.

Vapes: Vape labels must carry one of two statements:

• "This product was produced using only cannabis-derived terpenes." or
• "This product was produced using terpenes derived from sources other than cannabis."

The Commission's testing protocol also says that additives used in vape products, including terpenes, must be disclosed with their certificates of analysis, and that a written insert must go with each vape sold.

Neither label is automatically "better." They just tell you where the terpenes came from. For how processing affects terpenes, see live resin vs. live rosin vs. distillate.

Shopping by aroma

Terpenes give you a practical way to shop that doesn't rely on strain names or THC alone:

1. Start with what you like to smell. Citrus, pine, pepper or earthy musk.
2. Check the top terpenes on the lab summary.
3. Compare across products. Two flowers led by limonene will usually share a citrus note, even with different names.
4. Don't read the label as a promise. Aroma is the reliable part. Descriptions of experience vary from person to person.

Strain names and the indica/sativa label are an even weaker guide than terpenes. We explain why in indica vs. sativa vs. hybrid.

Keeping terpenes intact

Terpenes evaporate and break down with heat, light, air exposure and time. That's why a jar left open smells flat a week later. Keep products in their original child-resistant packaging, sealed, somewhere cool and dark. Our guide on how to store cannabis covers the details.

Browse by terpene profile

Where lab data is available, our product pages show the terpene results alongside potency and contaminant screens, taken from the lab summary tied to each package's METRC tag. Our lab results page explains the format.

Find a profile you like: browse flower, vapes or concentrates, with delivery to Cambridge, Somerville, Framingham and the rest of our area. Adults 21+ only.

For use only by adults 21 years of age or older. Keep out of the reach of children. This article is general information and makes no health or therapeutic claims.