How cannabis flower is grown and cured
Cannabis flower is the dried, cured bud of the female cannabis plant, harvested for its resin-coated surface. Growing it means raising plants under light, then trimming, slow-drying, and curing the buds in controlled humidity. Indoor, greenhouse, and sungrown describe where the plant got its light. This is general information, not medical or legal advice, and BudAbout makes no health claims.
What 'flower' actually is
When people say cannabis flower, they mean the dried bud of a female plant. Female cannabis produces clusters of small flowers along its stems, and as those flowers mature they get coated in sticky resin glands called trichomes. That resin is where most cannabinoids and aromatic terpene compounds sit. Male plants produce pollen instead of resinous buds, so commercial growers almost always grow seedless female plants, a result often labeled 'sinsemilla' (Spanish for 'without seed'). The buds you see in a jar are the harvested, trimmed, and dried versions of those flower clusters. A single plant can yield many buds of different sizes, from dense top colas to smaller 'popcorn' nugs lower on the stem. Everything about how a bud looks, smells, and weighs traces back to the plant's genetics and the conditions it grew in. None of this is a statement about how a product makes anyone feel; it is simply what the plant material is and where it comes from. Producer-reported cannabinoid and terpene figures you later see on a label describe this same dried flower after it has been tested.
Genetics and the starting plant
Every grow begins with genetics, and there are two common starting points: seeds and clones. Seeds are produced when pollen reaches a female flower, and each seed carries a slightly different mix of traits from its parents. Growers who want consistency often skip the variability of seeds and use clones instead. A clone is a cutting taken from a healthy 'mother' plant; because it is genetically identical to that mother, a room full of clones tends to grow uniformly and finish around the same time. 'Feminized' seeds are bred to produce female plants, which sidesteps the work of identifying and removing males. The strain or cultivar name on a package (the marketing name) points back to this genetic lineage, though naming across the industry is inconsistent and the same name can vary between growers. Genetics influence a plant's structure, its bud density, its aroma profile, and its general resin production. Understanding genetics is mostly about understanding consistency: a grower who controls the starting material has a better shot at repeatable flower batch after batch. We cover cultivar naming quirks in our 'indica vs sativa' post if you want more on labels.
Vegetative growth
After a plant takes root, it enters the vegetative stage, where it focuses on building leaves, stems, and root mass rather than flowers. This is the structural phase: the plant gets taller and bushier and develops the framework that will later support buds. Indoors, growers typically keep lights on for long daily stretches (often around 18 hours) to keep plants in this vegetative mode for as long as they want. The longer a plant vegetates, the larger it usually gets before flowering begins. During this stage many growers train their plants, gently bending or pruning stems so light reaches more bud sites and the canopy grows even. Nutrients during veg tend to emphasize nitrogen, which supports leafy green growth. Healthy roots and a strong stem now pay off later, because a sturdy plant can hold heavier flowers without flopping. Vegetative growth is also when problems are easiest to catch and correct: pests, nutrient imbalances, and spacing issues all show up here before they affect the harvest. The plant is not yet making the buds that become flower, but it is building everything those buds will need.
Cannabis is typically a short-day plant, meaning it starts flowering when nights get longer.
The flowering stage
Flowering is when the plant shifts from growing leaves to producing buds, and for most cannabis it is triggered by light. Cannabis is typically a short-day plant, meaning it starts flowering when nights get longer. Indoors, growers flip their light schedule to roughly 12 hours on and 12 hours off to simulate that longer night, and the plant responds by forming flowers. Outdoors, this happens naturally as summer turns to fall and days shorten. Flowering commonly runs several weeks to a couple of months depending on the cultivar. Over this stretch the buds swell, the resin glands multiply across the flower surface, and the plant's aroma intensifies. Nutrient needs shift too, generally moving toward more phosphorus and potassium to support bud development. 'Autoflowering' varieties are a notable exception: they flower based on age rather than light schedule, which makes their timing more predictable but their size often smaller. The end of flowering is judged partly by looking at the trichomes under magnification, since their color and clarity change as the flower matures. This appearance, not any effect, is what growers watch.
Indoor cultivation
Indoor growing means raising plants entirely inside a controlled space under artificial lights, with no reliance on the sun. Growers manage light, temperature, humidity, airflow, and carbon dioxide, which gives them tight control over the environment and the ability to run harvests year-round regardless of season or weather. Lighting comes from fixtures such as LED or high-intensity discharge lamps, and the light schedule is set manually to steer plants between vegetative and flowering stages. Because conditions are so controlled, indoor flower is often associated in the market with dense, uniform, heavily trichome-coated buds and a clean, consistent appearance. That control comes at a cost: indoor operations use significant electricity for lighting and climate systems, which raises both expenses and energy footprint, and that often shows up in a higher retail price. Indoor is also labor- and equipment-intensive. On a package, 'indoor' is a cultivation descriptor, not a quality guarantee or a health claim; it tells you where and how the plant got its light. Plenty of excellent flower is grown indoors, but the label alone does not determine how any given batch will look, smell, or test.
Greenhouse and 'light deprivation'
Greenhouse growing sits between fully indoor and fully outdoor. Plants grow inside a structure that lets in natural sunlight, while the grower still controls some variables like temperature, humidity, and protection from wind, rain, and pests. The big advantage is using free sunlight for much of the plant's energy while keeping a layer of environmental control. Many greenhouses add supplemental lighting for cloudy stretches and blackout systems for what is called 'light deprivation' or 'light dep.' Light dep means pulling automated curtains to artificially shorten the day, tricking plants into flowering earlier or on a schedule the grower chooses. This lets greenhouse operations time multiple harvests per year and start flowering before the natural season would. Greenhouse flower is often positioned in the market as a middle ground: more controlled and weather-protected than open-field sungrown, but more energy-efficient and lower-cost than fully indoor. As with any cultivation method, 'greenhouse' on a label is a descriptor of growing conditions, not a measure of potency or a claim about effects. The quality of any specific batch still depends on genetics, the grower's skill, and how carefully it was dried and cured.
Sungrown buds are sometimes less uniform in appearance than indoor and may be more affected by the conditions of a given season.
Sungrown (outdoor) cultivation
Sungrown, also called outdoor, means plants grow in open fields or plots under natural sunlight and the real seasons. Growers plant after the last frost in spring, the plants vegetate through the long days of summer, and they flower naturally as fall approaches and nights lengthen, with harvest typically in autumn. Because the sun does the heavy lifting, sungrown is the most energy-efficient and usually the lowest-cost method, and outdoor plants can grow very large, producing high yields per plant. The tradeoffs are exposure: weather, temperature swings, pests, mold pressure during damp stretches, and a once-a-year harvest window all add risk and reduce control. Sungrown buds are sometimes less uniform in appearance than indoor and may be more affected by the conditions of a given season. In the market, sungrown is often discussed in connection with sustainability and lower prices, and some buyers specifically seek it out. As always, 'sungrown' is a cultivation descriptor and not a statement about how a product performs or feels. A well-grown, well-cured outdoor batch and a poorly handled indoor one can land in very different places on quality.
Harvest and timing
Harvest is the moment a grower decides the flower is ready and cuts the plants down. Timing matters because it affects how the finished flower looks and tests, and growers use a few signals to choose the window. One common method is examining the trichomes under a loupe or microscope: as flowers mature, those resin heads shift from clear to cloudy to amber, and growers harvest based on the ratio they prefer. The drying-out of the small hair-like pistils on the buds is another rough visual cue. There is no single 'correct' day, just a range, and harvesting earlier or later nudges the final character of the flower. On harvest day, plants are typically cut at the base or broken down into branches. Some growers harvest the whole plant at once, while others do a staggered harvest, taking the more mature top buds first and giving lower buds extra days. Timing is genetics-dependent, since different cultivars finish at different rates, which is one reason clones (uniform genetics) simplify scheduling. Everything after harvest, drying and curing, builds on the foundation set by harvesting at the right moment.
Drying the flower
Drying is the first post-harvest step, and it is more delicate than it sounds. Fresh flower is full of water, and the goal is to remove most of that moisture slowly and evenly so the buds stabilize without degrading. Growers commonly hang whole branches or place trimmed buds on racks in a dark room held at moderate temperature and humidity, often cited around the 60s Fahrenheit with relative humidity roughly in the 50 to 60 percent range, with gentle airflow. The process usually takes somewhere around a week to ten days, though it varies with bud density and conditions. Going too fast, with high heat or low humidity, can dry the outside while the inside stays damp and can drive off volatile aromatic compounds, leaving harsh, brittle flower. Going too slow in stagnant, humid air invites mold. Darkness matters because light can degrade compounds in the flower over time. A common rule of thumb is that stems should bend and snap rather than fold when drying is done. Proper drying sets up the cure; rush it and no amount of curing fully recovers the lost aroma or smoothness.
After buds reach the right dryness, they are usually trimmed of excess leaf and placed into sealed containers such as glass jars or food-grade totes.
Curing and storage
Curing is the slow finishing process that follows drying, and many growers consider it where flower quality is made or lost. After buds reach the right dryness, they are usually trimmed of excess leaf and placed into sealed containers such as glass jars or food-grade totes. Inside those containers, remaining moisture redistributes evenly from the denser cores to the surface. Growers 'burp' the containers, opening them periodically to release built-up moisture and exchange air, frequently for the first couple of weeks and less often after that. A typical cure runs at least two to four weeks, and some producers cure for much longer. The point of curing is to even out moisture, mellow harshness, and let the flower's aroma develop and stabilize, while reducing the chance of mold during storage. Many growers monitor humidity inside the container, aiming for a stable mid-range, and some use humidity-control packs to hold it steady. Once cured, flower is best stored cool, dark, and airtight to preserve its character over time. Curing changes how flower looks, smells, and stores; it is a preservation and quality step, not a health claim of any kind.
What the label and COA describe
After flower is grown, dried, and cured, regulated products carry information that ties back to everything above. A package often lists the cultivar (marketing) name, the cultivation method (indoor, greenhouse, or sungrown), a harvest or packaged date, and producer-reported cannabinoid figures like total THC and CBD. Those percentages are measured on the finished, cured flower, usually by an accredited third-party lab, and they are reported by the producer, not by BudAbout; we do not lab-test anything. The certificate of analysis, or COA, is the more detailed lab document behind those numbers and may also cover terpene content and safety screenings for things like pesticides, microbes, and residual solvents, depending on the jurisdiction. None of these figures predict how a product will make anyone feel; they describe what is in the flower as a snapshot at testing. Freshness also factors in, since cannabinoid and terpene content can change as flower ages, which is why dates matter. If you want to go deeper, see our separate guides on reading a COA and on what producer-reported THC actually means. This is general information, not medical or legal advice.
Putting it together as a shopper
Knowing how flower is grown, dried, and cured changes how you read a jar. Cultivation method (indoor, greenhouse, or sungrown) tells you where the plant got its light and hints at cost and typical appearance, but it is a descriptor, not a quality verdict on its own. Genetics set the cultivar's potential; the grower's care during veg, flower, harvest, drying, and curing decides how much of that potential makes it into the jar. A heavy, even cure tends to show up as flower that looks and smells well-kept, while a rushed dry can leave buds harsh or brittle. Producer-reported THC, CBD, and terpene figures on the label and COA describe the tested flower, not its effects, and freshness dates matter because those numbers and the aroma shift as flower ages. The most useful habit is to treat every claim, marketing name, cultivation tag, and percentage, as one data point among several rather than a guarantee. BudAbout publishes reviews and education to help adults 21+ compare flower factually. We make no health claims, and this remains general information, not medical or legal advice.
FAQ
Is indoor cannabis better than outdoor?
Not automatically. Indoor offers tight environmental control and often dense, uniform buds, while sungrown is cheaper and more energy-efficient. 'Indoor' and 'outdoor' are cultivation descriptors, not quality guarantees. A well-grown, well-cured outdoor batch can outshine a carelessly handled indoor one. Genetics, grower skill, and the cure matter as much as where it grew.
What does 'sungrown' mean on a label?
Sungrown, also called outdoor, means the plant grew in open air under natural sunlight and seasons, typically harvested once in fall. It points to where the plant got its light and is often associated with lower cost and sustainability. It is a growing-method descriptor, not a measure of potency and not a claim about effects.
Why does curing take so long?
Curing slowly evens out the moisture left after drying, lets aroma develop and stabilize, and reduces mold risk during storage. It typically runs two to four weeks or longer, with growers 'burping' sealed jars to exchange air. Rushing it tends to leave flower harsher and less stable, which is why patience is standard practice.
What is light deprivation in a greenhouse?
Light deprivation, or 'light dep,' uses automated blackout curtains to artificially shorten the daylight a greenhouse plant receives. Because cannabis usually flowers when nights get longer, this tricks plants into flowering earlier or on a chosen schedule. It lets greenhouse growers time multiple harvests per year rather than waiting for the natural season.
Does cultivation method change the THC percentage?
Producer-reported THC is measured on the finished, cured flower by an accredited lab, and it reflects genetics, growing conditions, harvest timing, and handling together. No single method guarantees a higher number. The percentage describes what is in that batch at testing; it does not predict how a product feels. BudAbout does not lab-test anything.
How should I store cured flower at home?
Keep it cool, dark, and airtight. Light, heat, and air exposure can degrade a flower's aroma and cannabinoid content over time, and excess humidity invites mold while too-dry air makes buds brittle. Many people use sealed glass containers, sometimes with a humidity-control pack. Checking the packaged or harvest date also helps you gauge freshness.