Cannabis Glossary A–Z – All Terms Simply Explained

Cannabis Glossary A Z Key terms on cultivation, genetics and cannabinoids at a glance.

Terms like apical dominance, cola bud or EC value confusing you? Jump to the glossary FAQ section for quick answers ↧

Welcome to the Cannoptikum Hemp Glossary, your compact reference for essential cannabis terms, from grow room basics and nutrients to chemotypes, cannabinoids and breeding vocabulary.

Whether you are just starting out or already have experience, here you will find precise definitions, neutral explanations and direct links to in depth guides, product pages and beginner articles. The glossary is organised alphabetically and is continuously expanded for fast orientation and deeper understanding.

Jump directly to a letter:

A

• Afghani: Traditional indica landrace from Afghanistan, known for compact structure and strong resin production. Learn more about Afghani landraces
• Amnesia Haze: Classic sativa leaning cultivar with a longer flowering time and a complex aroma profile. Amnesia Haze strain profile
• Apical dominance: Growth pattern where the main top grows more strongly than side branches, important for training methods such as topping or main lining.
• Aphids: Common pest in indoor and outdoor cultivation that feeds on plant sap and weakens growth. Recognising and managing aphids
• Aroma profile: Combination of terpenes that shapes the botanical scent and character of a cultivar. Terpenes and cannabinoids
• Autoflower: Day neutral line that starts flowering independently of the light cycle, controlled by genetics. Autoflowering basics
• Autoflowering line: Genetic line with automatic flowering, often influenced by ruderalis, popular for short cycles and compact setups.

B

• Balanced chemotype: Chemotype where THCA and CBDA precursors occur in similar proportions, for example 1 to 1 or 2 to 1. Cannabis chemotypes explained
• Breeding line: Genetically stabilised line with reproducible traits, foundation of many modern cultivars.
• Bud rot: Common term for Botrytis infection inside dense flowers, a mould issue that can destroy buds. Detecting and preventing bud rot
• Bud mould: Fungal infection in flowers, most often linked to Botrytis and high humidity, poor airflow and dense structure. Avoiding bud mould
• Bubatz: German slang term from online culture related to cannabis, mostly used in memes and social media. Origin of the term “Bubatz”

C

• Cal yx: Part of the female flower that can contain seeds and often carries many resin glands.
• Carbon filter: Filter unit in the exhaust system that adsorbs odour molecules and supports discreet indoor cultivation.
• Cannabinoids: Group of plant compounds such as THC, CBD, CBG and CBN found in cannabis. Cannabinoids, quick overview
• Cannabinoid acids: Carboxylated precursor forms such as THCA, CBDA or CBGA that are present in raw plant material. Cannabinoids, quick overview
• CBDA synthase (CBDAS): Enzyme predominantly forming CBDA and shaping CBDA dominant type III profiles.
• CBGA synthase (CBGAS): Enzyme linked to higher CBGA production, characteristic for type IV lines.
• CBG (cannabigerol): Non intoxicating cannabinoid that acts as a biochemical precursor to several other cannabinoids. CBG explained
• CBN (cannabinol): Oxidation product of THC that typically appears in aged plant material. What is CBN
• CBD (cannabidiol): Well known non intoxicating cannabinoid described in many modern cultivars. CBD vs THC, neutral comparison
• CBDV (cannabidivarin): Rare cannabinoid from the CBD family, mainly found in selected genetics. CBDV overview
• Chemotype: Laboratory based classification of a genetic line according to dominant cannabinoid precursors such as THCA, CBDA or CBGA. Cannabis chemotypes explained
• Chemotype I: THCA dominant genetics with minimal CBD content.
• Chemotype II: Balanced profile with meaningful amounts of both THCA and CBDA.
• Chemotype III: CBDA dominant line, often described as CBD genetics.
• Chemotype IV: Genetics with dominant CBGA production and active CBGAS.
• Chemotype V: Very rare lines with nearly no cannabinoid production.
• Chlorosis: Yellowing of leaf tissue due to loss of chlorophyll, often linked to nutrient or pH issues. Interpreting leaf discolouration
• Cloning: Vegetative propagation via cuttings to produce genetically identical plants from a selected mother. How to take cuttings
• CO₂ enrichment: Deliberate increase of carbon dioxide in the grow room air to support photosynthesis and growth.
• Cola: Main flower cluster along the central stem that often becomes the yield focus of a plant.
• Cola bud: Large main flower at the top of the plant, often the most voluminous bud.

D

• 24/7 lighting: Continuous light cycle, sometimes used for cuttings or early stages, but not ideal for every setup.
• Dark period: Light free part of the day, crucial for inducing and maintaining flowering in photoperiod cultivars.
• Dark germinator: Seeds described as preferring germination in darkness, cannabis is often listed in this category.
• Decarboxylation: Process where cannabinoid acids such as THCA lose CO₂ under heat and convert into neutral forms. Decarboxylation explained
• Defoliation: Targeted removal of leaves to improve light penetration and air movement in the canopy. Defoliation, pros and cons
• Discoloured leaves: Umbrella term for symptoms caused by nutrient issues, pH problems or light stress. Causes of leaf discolouration
• Drainage: Ability of a substrate to let excess water flow away, helps prevent waterlogging and root issues.
• Drying phase: Time after harvest in which flowers are slowly dried under controlled conditions.

E

• EC value: Electrical conductivity of a nutrient solution, indicates the concentration of dissolved salts. Understanding EC and feeding
• Endocannabinoid system: Biological signalling network in the body that can interact with cannabinoids. What is the endocannabinoid system
• Entourage effect: Model describing how plant compounds such as cannabinoids and terpenes can interact as a whole. The entourage concept
• Enzyme activity: Activity of enzymes such as THCAS, CBDAS or CBGAS that influences which cannabinoid acids become dominant.
• Exhaust system: Ventilation system in an indoor grow room that removes warm, humid air and brings in fresh air, usually combined with a carbon filter.
• Expectation management: Realistic understanding of what a strain can and cannot deliver, reduces frustration and false assumptions. Expectations after buying cannabis seeds

F

• F1 hybrid: First generation from crossing two stabilised parental lines, often shows strong vigour and more uniformity. More about F1 hybrids
• Fan leaf: Large characteristic leaves responsible for most photosynthesis and energy production.
• Feeding schedule: Planned sequence and dosage of nutrients during vegetative and flowering stages. Planning fertiliser schedules
• Feminised seeds: Seeds bred to produce almost exclusively female plants, useful when only female flowering plants are desired.
• Fermentation: Post processing step where organic material is microbially transformed, traditionally used in some resin traditions. Hemp fermentation explained
• Filter: Component in ventilation systems or devices used to reduce particles and odours.
• Flowering phase: Stage where cannabis plants form flowers, triggered by photoperiod change in non autoflower varieties. Understanding the flowering phase
• Flower structure: Density, shape and arrangement of buds, a key characteristic in breeding and strain descriptions.
• Flushing: Rinsing the substrate with plain water to reduce excess nutrient salts. When flushing makes sense
• Forgiveness: Ability of a strain to tolerate minor mistakes or fluctuations without strong stress reactions. Cannabis strains that forgive beginner mistakes
• Frostiness: Colloquial term for heavy trichome coverage that gives flowers a frosted appearance.

G

• Genetics: Hereditary blueprint of a cultivar, defines structure, flowering time, aroma and cannabinoid profile.
• Genetic markers: DNA based markers indicating which cannabinoid synthases such as THCAS, CBDAS or CBGAS are active in a line.
• Genetic stability: Measure of how consistently plants of a strain develop across multiple runs, higher stability means fewer surprises. Stable cannabis lines and modern hybrids
• Genetic variation: Differences in growth and behaviour between plants of the same strain, lower variation supports predictability and learning. Cannabis seed selection
• Genotype: Genetic framework of a plant that defines which cannabinoids and terpenes it can potentially form. Genotype vs phenotype
• Germination: Process in which a seed takes up water, swells and develops a root and shoot. All about germination
• Germination rate: Percentage of seeds that successfully germinate, important quality indicator for seed lots.
• Germination temperature: Temperature range in which seeds germinate best, for cannabis often around 22 to 25 °C.
• Grow medium: Material in which roots grow, for example soil, coco, hydroton or rockwool.
• Growbox: Enclosed grow tent or cabinet equipped with light, ventilation and reflective surfaces.
• Growshop: Specialist store for cultivation equipment such as lights, fertilisers, soil and seeds.
• Guerilla growing: Outdoor cultivation at remote low visibility locations.

H

• Hardening off: Gradual adaptation of young plants to outdoor conditions such as UV light, wind and temperature swings, essential before transplanting outside.
• Hashish: Concentrated resin from the plant, obtained by mechanical or other separation methods. Hash varieties in neutral overview
• Haze: Family of sativa leaning cultivars with long flowering times and distinctive spicy or incense like aroma. Haze family overview
• Headshop: Retail store for smoking related accessories in popular culture, different from a growshop. Listed neutrally as a terminology term.
• Heat stress: Stress reaction caused by excessive temperatures or overly intense light, often visible as curled leaves.
• Heirloom: Landrace derived line maintained outside its original region while preserving historical traits.
• Hemp (cannabis): Cultivated plant of the genus Cannabis with diverse uses, from fibre and food to specialised genetics for research and seed production.
• Hermaphrodite: Plant that develops both male and female floral organs, can cause unwanted pollination and seed formation. Recognising hermaphrodites
• HPLC analysis: High performance liquid chromatography used to quantify cannabinoid precursors. Cannabinoids, lab perspective
• Humidity: Relative humidity in air or moisture in the substrate, crucial for germination, growth and mould prevention.
• Hybrid: Cross between genetically different lines, often shows more diversity and less uniform behaviour. Stability vs heterosis
• Hybrid line: Genetic line combining traits of different backgrounds such as indica, sativa or mixed. Hybrid basics
• Hydroponics: Soil less cultivation where roots grow in nutrient solution or inert media.

I

• Ice O Lator: Water and ice method using sieves to separate resin glands from plant material. Ice O Lator explained
• Indica: Cannabis type with more compact structure, broader leaves and often shorter flowering time. Indica facts
• Indoor grow: Cultivation in enclosed rooms or tents with artificial lighting, ventilation and climate control.
• Insect infestation: Presence of pests such as fungus gnats, spider mites or thrips on plants. Pests and plant diseases
• Internode: Section of stem between two nodes, important morphological parameter.
• Irrigation: Supplying plants with water based on medium, pot size, climate and growth stage. Watering basics

J

• Jiffy: Peat or coco pellet that swells with water and is used as a compact germination and seedling medium. How to use Jiffy pellets
• Joint (term): Popular culture term for a rolled cannabis product, listed here neutrally without instructions. Joint types, terminology
• Juvenile stage: Early vegetative stage after germination, plants are particularly sensitive to stress.

K

• Potassium deficiency: Nutrient deficiency that may show as brown leaf edges and weaker flower development. Recognising potassium deficiency
• Potassium value: Potassium content in nutrient solutions or substrates, important for flower development and cell stability.

L

• Landrace: Regionally adapted cannabis population that developed without modern breeding programmes. Landraces vs modern hybrids
• Lamp power: Wattage or effective light output of a grow lamp, key factor for yield and energy use.
• LED grow light: Energy efficient light source tailored to plant growth spectra.
• Light intensity: Amount of light per area, central for photosynthesis and flower formation.
• Lighting duration: Number of light hours per day, key parameter for growth and flowering indoors.
• Limonene: Citrus scented terpene commonly described in many modern cultivars. Terpene overview
• LST (low stress training): Training technique without cutting, branches are gently bent and fixed to optimise light distribution. What is LST

M

• Magnesium deficiency: Nutrient deficiency visible as interveinal yellowing on older leaves. Recognising magnesium deficiency
• Marketing claims: Promotional statements designed to attract attention, often missing context about real world behaviour or stability. Good cannabis seeds and marketing strains
• Medium: Substrate or system in which the plant grows, for example soil, coco or hydroponic setups.
• Micronutrients: Nutrients required in small amounts such as iron, zinc or copper, essential for plant metabolism.
• Minor cannabinoids: Cannabinoids that occur in smaller quantities such as CBG, CBC or THCV. Cannabinoids, full list
• Mother plant: Plant kept in a perpetual vegetative stage to provide cuttings. Caring for mother plants
• Mould: Fungal growth on flowers or roots, often due to high humidity or poor air movement. Preventing mould
• Mulching: Covering the soil surface to reduce evaporation and stabilise soil climate.
• Myrcene: Terpene often described with earthy and herbal scent notes. Terpenes and cannabinoids

N

• Nitrate: Nitrogen form commonly used in fertilisers, important for vegetative growth.
• NPK ratio: Ratio of nitrogen, phosphorus and potassium in a fertiliser.
• Nitrogen deficiency: Often starts with yellowing of older leaves and reduced growth. Recognising nitrogen deficiency
• Nutrient solution: Water mixed with dissolved fertilisers, used in hydro and coco systems.

O

• OG: Abbreviation originating from “Original Gangster”, now widely used in names of classic lines such as OG Kush. Listed neutrally as a naming term.
• Organic cultivation: Cultivation without synthetic fertilisers or pesticides, focuses on living soil and natural nutrient cycles.
• Organic grow: Cultivation approach that relies on compost, living soil and biological processes instead of synthetic fertilisers.
• Outdoor grow: Cultivation under natural light conditions outside, depends heavily on climate, soil and season. Choosing outdoor grow spots
• Ott: Older German slang term for cannabis, often used nostalgically in online culture. Ott, origin and scene slang
• Overfertilisation: Excess nutrient concentration can lead to leaf discolouration, stalled growth and root stress. Recognising overfertilisation
• Overwatering: Watering error where too much water is applied, can lead to oxygen shortage in the root zone. Over and underwatering
• Ozone filter: Device using ozone to break down odour molecules, typically an additional tool next to carbon filters.

P

• Paper towel method: Germination method where seeds are placed between moist paper towels and kept warm and evenly moist.
• pH value: Measure of acidity or alkalinity of a solution or substrate, influences nutrient availability. Understanding pH
• Phenotype: Visible expression of traits that arises from genotype and environmental conditions. Genotype vs phenotype
• Photoperiod: Day length that regulates growth and flowering in photoperiod cultivars. Photoperiods and light cycles
• Phosphorus deficiency: Deficiency that may show as dark green or purple discolouration and reduced root development. Recognising phosphorus deficiency
• Pistil: Hair like female flower structure that changes colour over time and helps estimate maturity.
• Pollen: Fine powder produced by male flowers, used for pollination and breeding.
• Popcorn buds: Small airy buds mostly found in the lower canopy. Avoiding popcorn buds
• Predictability: How reliably a plant repeats its growth pattern and development under similar conditions. Good cannabis seeds and marketing strains
• Pre fertilised soil: Substrate that contains slow release fertilisers, provides a basic nutrient supply in early weeks.

Q

• Quick dry: Fast drying method for small samples, useful for preliminary checks but not ideal for quality ripening.
• Quarantine: Isolating new or affected plants to reduce the risk of pests spreading in the grow.

R

• Regular seeds: Non feminised cannabis seeds that can develop into male or female plants. Regular cannabis seeds
• Regeneration (re veg): Technique to bring harvested plants back to vegetative growth by changing the light cycle.
• Resin: Sticky secretion produced in trichomes, contains cannabinoids and terpenes.
• Root ball: Dense cluster of roots in a pot, central for water and nutrient uptake.
• Root rot: Rot in the root zone, often caused by waterlogging, overwatering or poor aeration.
• Rootbound: Condition where roots fill the pot completely and have little room left, can slow growth and cause nutrient issues.
• Run off: Excess water that flows out of the pot after watering, can help assess saturation and pH behaviour.
• Ruderalis: Wild form of cannabis with genetically fixed automatic flowering, basis for many autoflower lines. Cannabis ruderalis explained

S

• Scarification: Gentle roughening of the seed coat to improve water uptake and speed up germination.
• SCROG (Screen of Green): Training method using a horizontal net to spread branches evenly and optimise light use.
• Seedling soil: Light low nutrient substrate with good water retention, ideal for germinating cannabis seeds. Best soil for cannabis seedlings
• Sativa: Cannabis type with taller more slender plants and generally longer flowering times. Sativa facts
• Scent profile: Combination of terpenes that creates the specific botanical aroma of a cultivar.
• Skunk: Classic hybrid line with strong characteristic aroma, backbone of many modern cultivars. What is Skunk
• SOG (Sea of Green): Cultivation method with many small plants for short and efficient cycles.
• Soil: Classic grow medium with organic matter, stores water and nutrients.
• Spider mites: Tiny pests that pierce leaf cells and may create light dots and fine webbing. Spider mites, recognition and control
• Stable line: Line refined over several generations to express predictable traits with limited variation. Understanding stable cannabis lines
• Stratification: Cold treatment technique for seeds that simulates winter conditions to support germination in some species.
• Stretch: Strong vertical growth at the beginning of flowering.
• Substrate: Material in which roots grow, for example soil, coco or rockwool.

T

• Temperature stress: Stress reaction due to overheating or cold, can affect metabolism and root development.
• Terpenes: Aromatic compounds that define much of the botanical scent and character of cannabis lines. What are terpenes
• Terpene profile: Composition of aromatic compounds that shapes the scent signature of a cultivar. Terpenes and cannabinoids
• Terpinolene: Spicy fresh terpene often described in certain sativa lines. Terpene overview
• THCA synthase (THCAS): Enzyme that predominantly forms THCA and characterises THCA dominant type I lines.
• Topping: Training technique where the main shoot tip is cut to encourage lateral growth. Using topping correctly
• Training methods: Techniques such as LST, SCROG or main lining used to optimise light distribution and yield. Training methods overview
• Transplanting: Moving plants into a larger pot or outdoors to support further root development and vigour.
• Trichomes: Resin glands on flowers and small leaves that contain cannabinoids and terpenes. Assessing trichomes

U

• Underwatering: Too little water, often visible as drooping dry leaves and slowed development. Over and underwatering
• Damping off disease: Fungal disease in seedlings that can weaken stems and cause plants to topple. Preventing damping off

V

• Variety (cultivar): Genetic type of a cannabis plant that defines growth habit, aroma profile and cannabinoid composition. Cannabis varieties explained
• Vegetative phase: Growth phase before flowering where plants build leaves, stems and roots. Nutrients in the vegetative phase
• Ventilation: Air movement and exchange system in an indoor grow, regulates temperature, humidity and CO₂ levels.
• VPD (vapour pressure deficit): Difference between actual and maximum air moisture, important factor for transpiration and water uptake.

W

• Water quality: pH, hardness and potential contaminants of irrigation water, affects nutrient availability. Water sources for cultivation
• Watering: Supplying plants with water, depends on substrate, pot size, climate and growth stage. Watering explained

X

• Xylem: Vascular tissue that transports water and dissolved nutrients from the roots to the upper parts of the plant.

Y

• Yield: Harvested quantity, often expressed per plant, per square metre or per watt.
• Y branching: Morphological term for symmetrical branching at one height, sometimes relevant for specific training approaches.

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Glossary, frequently asked questions

Note: This glossary provides neutral botanical information for educational purposes only. It does not give medical or legal advice and is not an encouragement to consume cannabis.