Holy Grail OG
Modern
F1hybrid-indica
Fire 18
Top flavors
earthyspicypine
Terpenes
CalmingEnergizing
Fire 18 effects are mostly calming.
Fire 18
Top flavors
earthyspicypine
Terpenes
CalmingEnergizing
Fire 18 effects are mostly calming.
Fire 18 is a modern hybrid-indica variety derived from its parent, The OG #18. This strain is cultivated both indoors and outdoors, requiring moderate grower experience to achieve a high yield within a 60-day flowering period. Its development has contributed to an extensive line of notable offspring, including Agent 18, Gas Leak, Howling Diablo, Nic The Bruiser, Smoked Catfish, Stoned Owl, Sunshine Kush, and 5 Leaf Clover.
The chemical profile of Fire 18 is THC-dominant and defined by a specific terpene progression that moves from myrcene to caryophyllene and finally to pinene. This combination shapes the sensory experience of the strain, anchoring its aromatic and flavor profile in these primary, secondary, and tertiary compounds.
Upon consumption, users report effects characterized by a sense of being relaxed, calm, and focused. These properties make Fire 18 a recurring choice for those managing pain, stress, or sleep-related concerns. Through its diverse genetic legacy across numerous offspring, the strain remains a consistent presence in modern breeding programs.
Terpene Profile
Synergies (+) and conflicts (−) are relative to each other within this profile.
myrcene ~60%caryophyllene ~28%pinene ~12%
| Terpene | Share | Character | Likely role |
|---|---|---|---|
| myrcene | ~60% | earthy | relaxing · solo |
| caryophyllene | ~28% | spicy | relaxing · social |
| pinene | ~12% | pine | focus · creative |
Research notes below describe isolated terpene mechanisms and early findings. They do not guarantee effects from this strain and are not medical advice.
Russo 2011: naloxone-sensitive analgesia, potentiates barbiturate sleep; dominant sedating terpenoid; blocks hepatic carcinogenesis by aflatoxin.
~28%
spicy
●●○○
Russo 2011: only terpene that is a selective full CB2 agonist (100 nM); Gertsch et al. 2008: acts as dietary cannabinoid; unique anti-inflammatory and gastric cytoprotective properties.
Russo 2011: acetylcholinesterase inhibitor (IC50 0.44 mM) counteracting THC-induced short-term memory deficits; most widely encountered terpenoid in nature; anti-inflammatory via PGE-1.
Effects
Reported effects — derived from terpene chemistry and cannabinoid profile.
Genetic Profile
Indica-dominant
■ Indica 70%■ Sativa 30%
Primarily indica with sativa influence. Relaxing body with some cerebral lift.
THC-Dominant
High THC, trace CBD. Psychoactive. Full CB1 agonism — euphoria, appetite, analgesia.
Genealogy
Parentage, ancestry, and genetic relatives of Fire 18.
Composite Traits
Dispensary Locator
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What would Fire 18 × ? produce?
Predict the terpene profile, effects, and growing traits of a cross. Our gene weaver engine votes on dominant traits from both parents.
Build a cross with Fire 18 →Similar strains
Same primary terpene with overlapping effects.
Frequently Asked Questions
Is Fire 18 indica or sativa?
Fire 18 is modeled here as a indica-dominant (primarily indica with sativa influence).
What terpene is dominant in Fire 18?
Myrcene is shown as the dominant terpene at approximately ~60%. Caryophyllene follows as the secondary terpene.
Is Fire 18 good for daytime use?
Fire 18 is versatile and works across different times of day depending on dose and individual response.
How accurate is this data?
See the "Data confidence" card in the sidebar. Terpene profiles and effects are chemistry-informed estimates — individual responses depend on phenotype, source, and personal chemistry.