Open a jar of well-kept genetics and the first thing to greet you isn't a figure on a lab sheet — it's a smell. Pine, citrus peel, wild berry, a note of alpine herb. That signature is the work of terpenes, the aromatic compounds a plant produces, and reading them is one of the oldest skills in genetics.
The molecules behind the aroma
Terpenes are volatile compounds shared across the plant world — the same family that gives pine its resinous scent and lemon peel its brightness. In cannabis they gather in the trichomes alongside the cannabinoids, and their particular blend is part of what makes one line smell unmistakably like itself. They are, in a sense, a variety's aromatic fingerprint.
The terpenes we look for
- Myrcene — earthy, musky, a touch of ripe fruit; common in many heritage lines.
- Limonene — bright citrus peel.
- Caryophyllene — warm, peppery, spiced.
- Terpinolene — fresh, piney, faintly floral.
- Linalool — soft florals, a whisper of lavender.
- Ocimene — sweet, herbaceous, green.
No single terpene defines a line; it's the proportion — the chord rather than the note — that gives a genetic its character. Our catalogue lists the dominant terpenes for each variety for exactly this reason.
Why terpenes matter to a collector
For someone preserving genetics, terpene expression is a marker of identity and stability. When a stabilized line reproduces the same aromatic profile generation after generation, that consistency is evidence the line breeds true. Aroma becomes a way of reading provenance — a sensory footnote to the paperwork.
See how these profiles sit within each lineage in the lineage map, or read our companion piece on the terpene aroma signature.