# Terpene loss

> The loss of volatile aroma compounds from cannabis through evaporation, oxidation and handling, fastest for monoterpenes and worst in warm, fast drying and poor storage.

- Canonical: https://genetixbay.com/knowledge/glossary/terpene-loss.html
- Also written: terp loss, losing terpenes, terpene evaporation, terpene degradation, aroma loss
- Glossary category: Harvest, drying and curing · Evidence: Established
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Terpene loss is the decline in a plant's aromatic compounds after harvest. [Terpenes](https://genetixbay.com/knowledge/glossary/terpene.md) are volatile. Monoterpenes such as myrcene, limonene and pinene evaporate most readily; [sesquiterpenes](https://genetixbay.com/knowledge/glossary/sesquiterpene.md) such as β-caryophyllene are heavier and better retained. Heat, airflow across the buds, light, oxygen and handling all speed the loss. Ross & ElSohly (1996) recorded large monoterpene losses on air-drying, and drying method strongly affects terpene retention in hemp work.

## In practice

Where growers lose terpenes, and what to do:
- **Fast, warm dry**: dry slow and cool, about 15-21 °C (60-70 °F), 55-62% [RH](https://genetixbay.com/knowledge/glossary/relative-humidity.md), 7-14 days.
- **Fans on the buds**: move air around, not onto, them.
- **Rough handling**: shaking, tumbling and warm-hand trimming break [gland heads](https://genetixbay.com/knowledge/glossary/trichome-heads.md).
- **Half-empty jars**: more air headspace means more oxidation; fill jars well.
- **Storage**: warm, bright or frequently opened jars lose aroma over months.

House position: [humidity packs](https://genetixbay.com/knowledge/glossary/humidity-pack.md) rob terpenes and are a marketing gimmick. Add a fresh bud to a jar that needs moisture instead.

## Don't confuse with

- **Cannabinoid degradation**: THC to [CBN](https://genetixbay.com/knowledge/glossary/cbn.md), mainly over storage.
- **Hay smell**: an off-aroma from a bad dry, not only lost terpenes.
- **Terpene profile**: the mix, set by genetics, not handling.

## Related terms

[Drying room](https://genetixbay.com/knowledge/glossary/drying-room.md), [60/60 rule](https://genetixbay.com/knowledge/glossary/60-60-rule.md), [Humidity pack](https://genetixbay.com/knowledge/glossary/humidity-pack.md), [Long-term storage](https://genetixbay.com/knowledge/glossary/long-term-storage.md), [Monoterpene](https://genetixbay.com/knowledge/glossary/monoterpene.md)

## Read more

- [Drying cannabis: the 60/60 method and water activity](https://genetixbay.com/knowledge/harvest-cure/drying.md)
- [Long-term storage: keeping cured flower potent and aromatic](https://genetixbay.com/knowledge/harvest-cure/long-term-storage.md)

## Sources

1. Ross SA, ElSohly MA. 1996. The volatile oil composition of fresh and air-dried buds of Cannabis sativa. Journal of Natural Products 59(1):49-51.
2. University of Georgia (thesis). Effects of drying method and storage on cannabinoids and terpenes in hemp. https://openscholar.uga.edu/record/27813