Terpenes are the fragrant oils that give cannabis its aromatic diversity. These oils are secreted in the flower’s sticky resin glands, the same ones that produce THC, CBD, and other cannabinoids. Terpenes are by no means unique to cannabis; they can be found in many other herbs, fruits, and plants as well. Limonene, for example, is a terpene that has a sweet citrus aroma. It is found in various cannabis strains, including Super Lemon Haze and Tangie, and is also found in the rinds of the everyday citrus fruits that we consume, such as lemons, limes and oranges.
Myrcene is likely the reason that strains referred to as “Indica” have a sedating effect. When the Myrcene level in a cannabis strain is 0.5% or higher, the effect of the THC becomes sedative. When the Myrcene level is less than 0.5%, the THC does not provide this effect; these strains tend to be more stimulating, and are often referred to as “Sativa”.
Effects: Alertness, memory retention, counteracts some THC effects
Medical Value: Asthma, antiseptic
Information credited to Leafly