The Complete
Cannabis Glossary
From terpenes to photoperiod, from flavonoids to feminized seeds — every term you'll encounter in the cannabis world, explained clearly and verified by science.
Cannabis Strain Types
Sativa, Indica, Hybrid, and Ruderalis — what each really means, and why the science is more nuanced than the labels suggest.
Cannabis Sativa
- ✓Taller plants with narrow, slender leaves
- ✓Longer flowering time
- ✓Origin: tropical regions (Central America, Southeast Asia, Africa)
- ✓Traditionally associated with uplifting, creative effects — linked to limonene, terpinolene, ocimene
- ✓Better suited for warm climates with long growing seasons
Effects vary significantly by individual strain terpene profile.
Cannabis Indica
- ✓Shorter, bushier plants with broad, wide leaves
- ✓Shorter flowering time
- ✓Origin: Hindu Kush mountain range (Afghanistan, Pakistan, India)
- ✓Traditionally associated with relaxing, body-focused effects — linked to myrcene and linalool
- ✓Well-suited for indoor growing and shorter outdoor seasons
The sativa/indica distinction for effects is not scientifically definitive — consult terpene profiles for a more accurate guide.
Hybrid
- ✓Cross between sativa and indica genetics (or autoflowering + photoperiod)
- ✓The vast majority of commercial strains today are hybrids
- ✓Effects fall on a spectrum based on dominant genetics
- ✓Classified as sativa-dominant, indica-dominant, or balanced hybrid
Cannabis Ruderalis
- ✓Short, stocky plant with naturally low THC
- ✓Originated in Central Asia and Russia
- ✓Key trait: flowers automatically based on age — not light cycle
- ✓Not typically grown on its own; used in breeding to create autoflowering strains
Classification informed by: PMC (NIH), Canadian Journal of Genetics, Dr. Ethan Russo MD research.
Photoperiod vs Autoflowering
The most important decision for new growers — and it comes down to how you want to control your grow cycle.
| Feature | ⏱️ Autoflowering | ☀️ Photoperiod |
|---|---|---|
| Flowering trigger | Age — flowers automatically 3–4 weeks after germination | Light cycle — requires 12 hours of darkness |
| Light control needed | No | Yes — must adjust lighting schedule |
| Total grow time | 8–12 weeks seed to harvest | 10–16 weeks seed to harvest |
| Vegetative stage | Very short (2–4 weeks) | Grower controls duration |
| Plant size | Compact / smaller | Taller, larger |
| Yield per plant | Lower, but multiple cycles possible | Higher per plant |
| THC potential | Comparable to photoperiod in modern strains | Can reach 20%+ THC |
| Best for | Beginners, fast cycles, small spaces | Experienced growers, maximum yield, breeding |
| Clonable? | Not recommended | Yes |
| Cannabis ruderalis? | Yes — provides the auto trait | No |
Autoflowering strains are ideal for beginners or anyone wanting a fast, fuss-free grow — no light schedule management required. Photoperiod strains give experienced growers more control, larger plants, and typically higher yields. Modern autoflowering strains have largely closed the THC gap with photoperiod varieties.
Cannabis Seed Types
Regular, Feminized, and Autoflowering Feminized — what each type produces and who each is best for.
Regular Seeds
- ✓Natural, unmodified cannabis seeds
- ✓Germinate as either male or female (~50/50 ratio)
- ✓Essential for breeders — males provide pollen for crossing genetics
- ✓Preferred by advanced growers seeking stable, natural genetics
- ✓Require identifying and removing males to prevent pollination
Feminized Seeds
- ✓Bred to produce only female plants (~99.9% accuracy)
- ✓Created by stressing a female plant to produce pollen, then self-pollinating
- ✓No male plants = no accidental pollination = all plants produce flowers
- ✓Ideal for most home growers and commercial cultivators
- ✓Can be photoperiod or autoflowering
Autoflowering (Feminized)
- ✓Contain Cannabis ruderalis + feminized genetics
- ✓Flower automatically 3–4 weeks after germination
- ✓Seed-to-harvest in 8–12 weeks
- ✓Multiple outdoor harvests possible per season
- ✓Easiest entry point for new growers
Note: Most autoflowering seeds sold commercially today are feminized autoflowering seeds.
Cannabis Terpenes
The science of aroma, flavor, and effect — what terpenes are, how they work, and which ones matter most.
Terpenes are organic aromatic compounds found in cannabis — and in thousands of other plants, from lavender to pine trees to citrus fruit. In cannabis, they are produced by the same glands (trichomes) that produce THC and CBD. They are primarily responsible for the characteristic aromas and flavors of different strains.
Over 100 terpenes have been identified in cannabis. Research suggests terpenes may also influence the subjective effects of cannabis — a theory known as the entourage effect — though this remains an active area of scientific investigation and is not yet conclusively proven. What is confirmed: terpenes are real, measurable compounds with documented pharmacological properties in peer-reviewed research.
Myrcene
Aroma: Earthy, herbal, musky, slightly fruity
Also found in: Mangoes, hops, lemongrass, thyme
Research-backed properties: Sedative properties documented in animal studies; muscle-relaxing effects
Common in: OG Kush, Blue Dream
The most abundant terpene in most commercial cannabis strains.
Limonene
Aroma: Citrus, lemon, orange
Also found in: Lemon and orange peel, juniper
Research-backed properties: Potential antidepressant and anxiolytic properties in preclinical studies; a double-blind placebo-controlled study (Johns Hopkins & U. of Colorado, Drug and Alcohol Dependence 2024) found d-limonene significantly reduces THC-induced anxiety — [PubMed study →]
Common in: Sativa-dominant and uplifting strains
β-Caryophyllene
Aroma: Peppery, spicy, woody
Also found in: Black pepper, cloves, cinnamon
Research-backed properties: The only cannabis terpene documented to bind directly to CB2 receptors — a selective CB2 agonist (Ki = 155 nM). Anti-inflammatory, analgesic, anxiolytic, neuroprotective, antifungal, antibacterial — [PubMed study →]
Common in: Diverse strains across indica, sativa, and hybrid profiles
Its CB2 receptor binding makes it uniquely relevant in cannabis pharmacology.
Linalool
Aroma: Floral, lavender, slightly spicy
Also found in: Lavender, coriander, birch trees
Research-backed properties: Sedative and anxiolytic effects demonstrated in animal models; modulates GABA-A receptors (sedative α1β2γ2 subtype), with anxiolytic effects antagonized by flumazenil — confirming GABAergic mechanism — [PubMed study →]
Common in: Relaxing, indica-leaning strains
α-Pinene
Aroma: Pine, fresh forest, woodsy
Also found in: Pine trees, rosemary, basil, dill
Research-backed properties: Antibacterial, anti-inflammatory, bronchodilator, neuroprotective (research against amyloid-beta accumulation)
Common in: Jack Herer
Humulene
Aroma: Hoppy, earthy, woody, herbal
Also found in: Hops, sage, ginseng
Research-backed properties: Appetite-suppressing, anti-inflammatory, antibacterial
Common in: Girl Scout Cookies, Death Star, Candyland
Terpinolene
Aroma: Fresh, piney, herbal, slightly citrus and floral
Also found in: Nutmeg, tea tree, conifers
Research-backed properties: Antioxidant, antifungal, antineoplastic (preclinical); potentially uplifting at lower doses
Common in: Jack Herer, Ghost Train Haze, Durban Poison
Ocimene
Aroma: Sweet, woody, citrusy, herbal
Also found in: Mint, parsley, orchids, basil
Research-backed properties: Anti-inflammatory, antiviral, decongestant properties; potentially energizing
Common in: Super Lemon Haze, Purple Haze, Dutch Treat
Bisabolol
Aroma: Subtle floral, sweet, chamomile-like
Also found in: German chamomile, candeia tree
Research-backed properties: Anti-inflammatory, analgesic, skin-soothing
Valencene
Aroma: Sweet citrus, fresh orange
Also found in: Valencia oranges
Research-backed properties: Anti-inflammatory properties shown in preclinical research
Common in: Tangie, Agent Orange, Clementine
Geraniol
Aroma: Floral, sweet, rose-like
Also found in: Roses, geraniums, citronella
Research-backed properties: Neuroprotective, antioxidant properties in preclinical research
Common in: Amnesia Haze, Master Kush
Cannabis Flavors vs Terpenes
A common point of confusion — explained precisely.
Short answer: Related, but not identical.
Terpenes are the primary contributors to cannabis aroma, but flavor also involves non-terpene volatile compounds called flavorants, making the full aromatic profile a complex interaction of multiple compound classes.
When you browse strain profiles and see tags like "Citrus," "Earthy," "Berry," or "Diesel," these are flavor descriptors — shorthand for the aromatic experience. These flavors are primarily driven by terpenes, but not exclusively.
Peer-reviewed research published in ACS Omega found that "minor, nonterpenoid volatile compounds" — including esters, alcohols, and sulfur compounds — can drive distinctive aromatic differences between cultivars, even when dominant terpene profiles are similar. Two strains with identical myrcene and caryophyllene concentrations can taste and smell markedly different.
Flavonoids do NOT contribute to aroma or flavor — they are non-volatile. Their role is primarily bioactive.
Note: These are general associations. Individual strains within each category will vary.
Cannabis Flavonoids
The overlooked bioactive compounds — what the science actually confirms, and what remains under investigation.
Flavonoids are polyphenolic compounds found in most fruits, vegetables, and flowers. In cannabis, more than 20 distinct flavonoids have been identified. Critically: flavonoids are non-volatile — they do not evaporate and do not contribute to the aroma or smell of cannabis. This distinguishes them clearly from terpenes.
Total flavonoid content in cannabis leaves and flowers can reach approximately 2.5% of dry weight. Vitexin has been identified as the most abundant flavonoid in cannabis.
Cannaflavins A, B & C
[PubMed →]Flavones unique to cannabis. Cannaflavin-A inhibits prostaglandin E2 (PGE2), a key mediator of inflammation. Cannaflavins A & B showed IC50 of 0.7 μM in human rheumatoid synovial cells (Barrett et al., 1985; Preet et al., 2020). Preclinical research — not a clinical recommendation.
Quercetin
A common flavonol with documented anti-inflammatory, antifungal, and antiviral properties. Found in many plants including onions and apples.
Kaempferol
Linked in epidemiological research to reduced risk of certain cancers and coronary disease. May have neuroprotective properties relevant to Parkinson's disease research.
Apigenin
Acts on GABA receptors, producing anxiolytic and mildly sedative effects; may stimulate monoamine transporters.
Luteolin
Documented antioxidant and anti-inflammatory properties in preclinical studies.
Vitexin
The most abundant cannabis flavonoid. Documented antioxidant and anti-inflammatory effects.
Cannabinoids Explained
THC, CBD, CBG, CBN, CBC & THCV — how each interacts with the human endocannabinoid system.
Cannabinoids are the chemical compounds produced in the trichomes of the cannabis plant that interact with the human endocannabinoid system (ECS) — a cell-signaling system present in all humans that helps regulate mood, sleep, appetite, pain response, and immune function.
THC
Psychoactive- ✓The compound that gets you high
- ✓Reduces pain and nausea (used medically)
- ✓Stimulates appetite
- ✓Low doses may reduce anxiety; high doses can increase it
- ✓Can impair short-term memory at high doses
Tetrahydrocannabinol — the primary psychoactive compound in cannabis. Binds to CB1 receptors in the brain and CNS. Documented effects: euphoria, altered sensory perception, increased appetite, analgesic (pain-reducing) and antiemetic (anti-nausea) properties. Important nuance: THC's effect on anxiety is biphasic — low doses may be anxiolytic; higher doses can be anxiogenic, causing anxiety and paranoia in susceptible individuals. Short-term memory impairment at high doses is well-documented.
[PubMed study →]CBD
Non-psychoactive- ✓Does not get you high
- ✓Reduces anxiety and inflammation
- ✓FDA-approved for epilepsy (Epidiolex)
- ✓May reduce the anxious side effects of THC
- ✓One of the most studied cannabinoids
Cannabidiol — does not produce intoxication. Acts via partial agonism of 5-HT1A receptors and negative allosteric modulation of CB1 — not through direct CB1 binding. Documented effects: anti-inflammatory, anxiolytic, antipsychotic properties in research. The only cannabis-derived compound with FDA approval: Epidiolex (approved June 2018) treats seizures in Dravet syndrome, Lennox-Gastaut syndrome, and tuberous sclerosis complex in patients ≥1 year old.
[PubMed study →]CBG
Non-psychoactive- ✓Does not get you high
- ✓The chemical parent of THC, CBD, and CBC
- ✓Found in very low amounts in most strains (<1%)
- ✓Early research suggests anti-inflammatory benefits
- ✓No human clinical trials yet — research is early stage
Often called the mother of cannabinoids — CBGA (the acid form) is the biosynthetic precursor from which THC, CBD, and CBC are synthesized. Typically found at <1% in finished cannabis. Preclinical evidence shows anti-inflammatory, antioxidant, and neuroprotective activity in cell and animal models. No human RCTs published as of 2026 — all findings remain preclinical. An active and promising research area.
[PubMed study →]CBN
Mildly psychoactive- ✓Forms naturally as THC ages and degrades
- ✓Marketed as a sleep aid — evidence is mixed
- ✓May reduce nighttime wake-ups (2024 RCT)
- ✓Does not help you fall asleep faster
- ✓Much weaker psychoactive effect than THC
Formed when THC oxidizes with age or heat exposure. Widely marketed as a sleep cannabinoid. A 2024 double-blind, randomized, placebo-controlled study (Bonn-Miller et al.) found 20mg CBN nightly reduced nighttime awakenings and overall sleep disturbance, but had no significant effect on sleep onset latency. Mildly psychoactive at higher doses but significantly less potent than THC. The broader sedative reputation may partly originate from aged cannabis with degraded terpenes.
[PubMed study →]CBC
Non-psychoactive- ✓Does not get you high
- ✓Anti-inflammatory effects shown in lab studies
- ✓Works better alongside CBD (combined effect)
- ✓Pain-relieving potential under investigation
- ✓No human clinical trials yet
Cannabichromene — non-psychoactive, does not significantly bind to CB1 receptors. Anti-inflammatory activity demonstrated in human macrophages in vitro (2023) and in arthritis models, where CBC combined with CBD produced greater anti-inflammatory effect than either compound alone. Antinociceptive effects shown in animal studies via TRPA1 and TRPV1 receptor interactions. Anti-inflammatory, anticonvulsant, and antibacterial properties under active investigation. No human RCTs published as of 2026.
[PubMed study →]THCV
Dose-dependent activity- ✓Suppresses appetite at low doses (opposite of THC)
- ✓Energising and stimulating at low doses
- ✓Studied for weight management and diabetes
- ✓Rare — found in very small amounts in most strains
- ✓Effects change significantly depending on dose
At low doses, acts as a neutral CB1 receptor antagonist — reducing appetite, increasing satiety, and producing stimulating effects (Pertwee et al., 2008). At higher doses, animal studies suggest partial CB1 agonism, though human high-dose psychoactivity is not yet well-characterized clinically. A randomized, double-blind, placebo-controlled trial in 62 type 2 diabetes patients (Diabetes Care, 2016) found THCV modulated glycemic control and lipid parameters. Rodent studies confirm appetite suppression and upregulated energy metabolism.
[PubMed study →]Growing & Cultivation Terms
Key terminology for understanding cannabis cultivation — from seed to harvest.
Seed Bank & Breeder Glossary
Understanding the difference between a seed bank and a breeder — and the terms you'll encounter when buying seeds.
A–Z Cannabis Glossary
Every term defined — alphabetically indexed with links to full explanations.
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Frequently Asked Questions
Quick answers to the most common cannabis terminology questions.
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