Guides
What the research shows, what it does not, and how to read a label.
The essentials
What it is, what it is not, and the minimum vocabulary.
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CBD and THC have the same formula: C21H30O2
Same atoms, different shape — one open ring. That single difference decides receptor binding, drug tests, and why the law measures THC rather than the plant.
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Hemp seed oil and CBD oil are not the same product
One is pressed from seed and has almost no cannabinoids. The other is an extract with a number on it. How to tell them apart before you pay.
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Structure, and what it explains about handling
Where the molecule sits, what it dissolves in, and why it degrades the way it does. The structure accounts for most of the practical advice given about storage.
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The cheapest form, and the one nobody can weigh
The cheapest form per milligram, sold as a powder that almost nobody at home can measure accurately. The arithmetic and the scale are the whole subject.
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The most asked question, and the one we cannot answer
What a seller may say is set by a public register, and nothing is listed for this substance. What that means, and where the question belongs.
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The name on a certificate and the one on a label
Documents use the full chemical name and marketing uses the abbreviation. The gap between the two vocabularies hides several distinctions worth knowing.
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Three words, none of them legally defined
Full spectrum, broad spectrum and isolate are commercial terms with no legal definition. What each usually means, and what the certificate says instead.
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What is CBD? Origin, THC difference, and how to choose
Cannabidiol explained plainly: what the molecule is, where it comes from, why it does not get you high, and what full spectrum, broad spectrum and isolate mean.
The questions everyone asks
The recurring questions, answered with what is known.
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CBD and alcohol: what one 1979 study actually found
Almost every page on this topic traces back to one small study from 1979. What it measured, what it did not, and the interaction that matters far more.
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CBD benefits: one is approved, the rest are tiers
The one benefit a European regulator signed off happens at 700 times the daily intake the same institution calls provisionally safe. Both files are real.
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CBD dosage: three numbers that cannot all be right
EFSA says 2 mg a day. The evidence starts at 300. The shelf sells 25. This page gives you the arithmetic and the sources, and deliberately gives you no dose.
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CBD for anxiety: the whole evidence base is 316 people
A 2024 meta-analysis screened 1,550 papers and found eight. Its effect size is large and its confidence interval nearly touches zero. Both facts matter.
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CBD for pain: two 2024 reviews, opposite answers
One found 42–66% pain reduction. The other found no benefit over placebo in 15 of 16 trials. Both are right, and the reason why is what matters.
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CBD for sleep: 34 studies, 2 about insomnia
The studies that worked mostly contained THC. The products that work mostly contain melatonin. A Mayo Clinic review and a label, read together.
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CBD side effects: the ones you feel, and the ones you don't
Tiredness, diarrhoea and appetite change are uncontested. What regulators worry about is liver, thyroid and reproductive — and none of those is felt.
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Drug tests do not look for CBD. They look for THC.
The panel screens for a THC metabolite, so the question is what else is in your product — plus the semi-synthetics sold as hemp that do trigger positives.
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How long CBD stays: three questions, three answers
How long you notice it, how long it is in your blood and how long it is detectable are different questions — and almost nobody tests for CBD anyway.
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Two categories that share a plant and nothing else
A prescribed medicine and a consumer product are different legal categories, with different rules, oversight and routes. This page is about the boundary.
Choosing and buying
Comparing prices properly and knowing what to ask.
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Buying CBD oil in the UK: what the label has to prove
Price per milligram, the batch certificate and the FSA novel foods list. What separates a good oil from an expensive one on the British market.
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Eight questions to ask before paying
All eight have factual answers a competent seller supplies in one reply. How they respond tells you as much as what they say.
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Same variety, same content, and yet
Two products can match on every stated figure and still differ noticeably. Six reasons why, all of them real, none of them on the label.
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The FSA public list does not cover CBD vapes
The one check that works for UK CBD oils is meaningless for e-liquids, because novel food law applies to food. And disposables became unlawful on 1 June 2025.
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The only division that makes two offers comparable
Price per gram compares nothing across formats or concentrations. One division fixes that, and it is the single most useful arithmetic in this category.
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The only view on this page nobody paid for
Ranking sites, affiliate links and incentivised reviews. How the money moves, what the disclosure rules require, and what a review can never tell you anyway.
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The UK has a number for this. No ranking on page one uses it
The FSA set the world's first provisional ADI for CBD: 10 mg a day, or 4–5 drops of a 5% oil. Here is the measuring stick instead of an eleventh ranking.
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What a high price actually buys
Sometimes testing, careful production and documentation. Sometimes packaging and positioning. The difference is checkable; the price never shows it.
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What European law provides after you have paid
A withdrawal period on distance purchases, a two-year conformity guarantee, and a set of exceptions that matter here more than in most categories.
Verifying and storing
The lab report, the batch, and what ruins a product at home.
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Container, place, and how often you open it
Three variables decide how fast flower degrades, and all three are free to control. Everything else sold for the purpose is optional.
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Finding the code that ties a product to its report
It is printed small, in a different place on every package, and without it no certificate can be matched to anything you are holding.
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Five habits that cost more than they look
The common storage errors are not exotic. They are the refrigerator, the windowsill, the original bag, the daily opening, and the oversized jar.
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Nose, eyes, fingers, loupe, paperwork
A repeatable inspection in that order, taking about three minutes. Four of the five steps need no equipment and the fifth costs a few euros.
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Six mandatory items, and the two that matter
Most of a label is fixed by regulation. Two fields decide whether the price is good and whether the contents can be verified at all.
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The document that decides everything, line by line
A batch certificate is the only piece of paper that ties a product to a measurement. Here is what each line means, and which ones are usually missing.
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The line that only appears when solvents were used
Extraction leaves traces. Which solvents are screened, what the thresholds mean, and why this line carries more weight on a concentrate than on flower.
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The narrow band where nothing goes wrong
A few points of relative humidity separate brittle material from material at microbiological risk. What sets the band, and how to hold it.
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What heat does to the acid forms
The plant makes acids. Heat and time turn them into the neutral forms, and that single reaction is why total THC has to be calculated rather than read.
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What to smell for before you look
Contamination announces itself by odour long before anything is visible, and the visible signs are easily confused with normal features of the material.
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Why 'none detected' does not mean none
Two abbreviations on a lab report are read as zero and mean something else. The difference changes what a product can legally be sold as.
The formats
Oil, capsules, vape, cream, tea, flower and resin.
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CBD capsules: absorption traded for certainty
The only format where you know exactly what you took, and the one where least of it arrives. What you eat with it matters more than the strength you bought.
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CBD gummies in the UK: the most expensive format
Gummies cost the most per milligram, and the whole dose goes by the slowest route. How to check a tub before you pay, and what the law says.
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CBD oil must never go in a vape. Ever.
One dissolves in food oil, the other in PG and VG. Plus counterfeit vapes containing synthetic cannabinoids, and the arithmetic of milligrams per puff.
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CBD tincture: almost none of them are tinctures
A tincture is an alcohol extract. Read the ingredients on almost any CBD tincture and you find coconut oil. The word is marketing, not chemistry.
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Half the "CBD flower" shelf is now THCA flower
The hemp definition measures delta-9 THC in raw flower. THCA is not delta-9 until it is heated — and that gap reshaped the entire American flower market.
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Hemp oil is two products, and a state agency says so
Vermont's Agriculture Agency publishes a page on the difference between hemp seed oil and CBD. When a regulator intervenes, the confusion is expensive.
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Hot water alone will not extract it
The compound does not dissolve in water. An infusion made without fat leaves most of what was paid for in the leaves, and the label rarely mentions it.
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In a CBD cream, only the INCI list decides
Where Cannabidiol sits in the ingredient list tells you how much is inside — and why most CBD rubs work on menthol, which is cheap, not CBD, which is not.
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The minute under the tongue is how CBD oil is used
Most people squirt and swallow, which turns a 13–19% route into a 6% one. Two seconds of patience is worth more than doubling what you bought.
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What does the carrying, and why it matters
The carrier is most of the bottle by volume. It determines taste, texture, shelf life and allergen status, and it is the first thing on the ingredient list.
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What separates two ways of heating
Two heating element designs, two failure modes, and a set of claims about material safety that mostly rest on nothing verifiable.
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Why a drop is not a unit of measurement
Drop size varies with the dropper, the viscosity and the angle. Anything expressed in drops rests on a quantity nobody controls.
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Why the number on the screen is not the one that acts
A device displays the temperature of its heater. The material sits somewhere else, at a different temperature, and the gap is where most confusion lives.
Animals
What changes when the recipient is not a person.
Legal framework
The perimeter, and the vocabulary it produced.
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HHC is controlled everywhere in Europe, and now worldwide
HHC went under international control on 6 December 2025. What the UN decided, what each country did first, and why the legal-loophole argument is finished.
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The 2016 Act covered it before it ever arrived
Britain never had a THCP loophole: the Psychoactive Substances Act bans by definition, not by name. What the molecule is, and what «33 times» actually measured.
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The register that decides what may be grown
One public list determines which varieties may be cultivated in the Union. It is the only naming in this subject attached to a formal examination.
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Three federal answers to whether CBD is legal, all true
The Farm Bill made hemp lawful. The FDA says adding CBD to food is illegal. The Pentagon bans it for service members. None of the three contradict.
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Three letters in the name did most of the selling
H4CBD is hydrogenated CBD, sold as the successor to HHC. Why the «CBD» in the name was misleading, and where the molecule stands legally.
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What comes out of a chemical conversion
A plant compound converted in a reactor produces the target molecule and a set of by-products. Routine panels look for the first and not the second.
Chemistry and botany
The molecules and the structures that hold them.
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An appealing hypothesis, poorly demonstrated
The idea is cited everywhere as settled fact. It rests on a 1998 paper, some in vitro work, and no published comparative trial to this day.
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CBD, CBG, CBN and CBDA: the whole plant family
How the plant builds every cannabinoid from one precursor — and what that explains about prices, labels, lab reports and the word raw.
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Six compounds carrying almost all the aroma
None of them is unique to this plant. The same molecules make hops, lemon peel and pine, and these six dominate most certificates.
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The family of compounds nobody discusses
They give the colour, they occur in nearly every plant, and two of them are found nowhere else. They are almost never measured.
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The head, the stalk, and what breaks between
Almost everything sold in a flower is made inside glands a tenth of a millimetre across, sitting on stalks thin enough to shear off at a touch.
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What leaves first, and fastest
A flower loses its smell long before it loses its stated content. Four mechanisms explain it, and only two of them are the buyer's to control.
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What time makes in a sealed jar
The plant barely produces this molecule. It appears afterwards, during storage, and its presence mostly records how old a batch is.
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Where the other cannabinoids come from
One molecule is the starting point for nearly all the others. It disappears along the way, which is exactly why products made from it cost what they do.
Craft and extraction
Separating what matters from the rest of the plant.
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A gas that behaves like a liquid
Above a certain pressure and temperature, carbon dioxide dissolves what a solvent would. On depressurisation it becomes gas again and leaves nothing behind.
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A local population, and what the name now covers
The word denotes a locally adapted plant population, not a registered variety. What that means agronomically, and why the distinction now matters commercially.
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Between 90 and 99 per cent lies the difference you pay for
A distillate keeps what an isolate discards. What sits in the remaining ten per cent, and why it changes both the price and the product.
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Blonde, brown, black, and what causes each
Colour in a resin has four possible causes and only one of them is quality. Learning to tell them apart is most of what visual assessment can offer here.
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Cold, agitation, and a stack of screens
No chemistry in the bucket. Cold makes the glands brittle, agitation knocks them off, and calibrated mesh sorts them by size alone.
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Collecting resin from a plant still standing
The only method where harvest happens without cutting the plant, by rubbing the flowers between the hands. How it works and what it leaves in the material.
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Flower, extract, and a dusting on top
Three products combined into one, with a total content that is a weighted average nobody calculates. The construction is simple and the labelling rarely is.
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Heat, pressure, and nothing added
Two plates, a temperature and a force. The material is squeezed until the resin flows out, and no solvent enters the process at any point.
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How to read a resin's texture, and in what order
Dry, oily, brittle or creamy. What each consistency says about process, pressing, age and storage — and the order in which to check.
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Ice-water hash brought to texture without heat
A resin matured cold over days instead of pressed warm. Where the creamy texture comes from, which lab section matters most and what the name does not promise.
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One letter separates live resin from live rosin
Two nearly identical names for opposite processes. One uses a solvent, the other does not — and that decides which analysis panel to demand.
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Sieving dry or separating in water: two philosophies
Dry leaf shatters, wet leaf stays whole. That is the entire difference between the two processes, and it sets the purity each can reach.
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The number that means four different things
Yield figures circulate constantly and almost never state their basis. The same process can be quoted at wildly different percentages, all of them honest.
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The same operation at two temperatures
Pressing resin warm makes it cohesive and darkens it. Pressing it cold preserves more and takes longer. Both are legitimate and they produce different products.
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The step that takes out the waxes
Dissolve the extract, chill it hard, and the plant waxes fall out of solution. One of the simplest operations in processing, and one of the most consequential.
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Three routes to a concentrate that stays under the limit
Genetics, a purification step, or starting from an isolate. The arithmetic that decides it, and why not detected is a statement about the laboratory.
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Two traditions, two climates, two results
Two long-established regions with genuinely different methods. The differences are climatic and technical, and almost nothing sold in Europe comes from either.
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Warm in the hand, hard in the drawer
The same material behaves completely differently at different temperatures, and changes again over months. Neither shift indicates anything about quality.
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Wax, crumble, shatter, badder: four names, one substance
These terms describe textures, not processes or grades. What actually separates them, how each arises, and why they change inside the jar.
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What each micron screen actually holds back
Ice water makes resin glands brittle; the screens sort them by size alone. What each fraction contains, and what the number on the bag does not tell you.
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What stays behind on a dry screen
The oldest separation method there is: shake dried material over calibrated mesh and collect what falls through. It sorts by size and nothing else.
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What the word pollen actually means in a shop
The term does not come from botany and fixes neither mesh, nor raw material, nor grade. Two very different goods carry the same label.
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Who decides that a hash is six star, and on what evidence
The scale is a self-reported result of an unstandardised test. Five things separate it from a measurement, and it has none of them.
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Why some material never gets dried
Freezing at harvest skips the stage where most of the aroma is lost. It also commits the producer to a cold chain and to one destination for the crop.
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Why the temperature matters more than the solvent
Ethanol dissolves nearly everything in the plant. Chilling it is what makes the process selective, and the temperature is the whole of the technique.
From harvest to jar
Drying, curing, and what happens along the way.
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Cutting by hand or running the harvester
The choice is made before planting: it determines the variety, the row spacing, the plant height and where the harvest can be sold.
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Four quantities that move in opposite directions
Removing leaves is not only cosmetic. It is a trade-off between appearance, taste, the weight sold, and the glands that leave with them.
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Scissors, drum, and what separates them
An operator finishes a few hundred grams an hour, a machine several kilos. The cost gap is tenfold and it is visible on the product.
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The signs that a bud was pushed, not grown
Growth regulators make flowers dense and heavy without adding resin. What the label never says, which signs appear together and which lab section catches it.
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What calibre changes, and what it does not
Small buds sell for considerably less than large ones. Part of the gap is explained by real differences, the rest is a market convention.
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What compactness says and does not say
A hard, heavy flower reads as better. It is a genetic and climatic trait, not an indicator of content, and it carries a drawback nobody mentions.
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What happens during the weeks after
Drying stops and the material keeps changing. It is the least visible stage of the chain, the most argued over between producers, and the least documented.
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What ten extra days change about a harvest
Three days in a heated room or two weeks in a controlled one: the same harvest gives two different products, and no document records which happened.
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What the eye decides a week before the cut
A grower examines glands fifty micrometres across through a loupe and fixes a date. The heaviest decision of the cycle, taken without instruments.
Cultivation
Where and how it grows, and why that changes the product.
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Getting seed without a single male plant
The technique reverses the sex of one plant so it can pollinate another. Both parents are female, so every seed that results is female too.
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The difference between a fed soil and an inert substrate
In one, the grower feeds the plant. In the other, the grower feeds a community of organisms that feeds the plant. Everything else follows from that.
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Three growing modes and what each costs
Full control, partial control, or none. The choice sets the cycle length, the energy bill, the risk profile and the price a buyer eventually pays.
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Two ways of delivering the same thing to a root
A root takes up dissolved ions either way. What differs is whether a buffer sits between the grower and the plant, and what happens when something goes wrong.
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What a place actually leaves in the plant
The concept comes from wine, where it has a legal framework behind it. Here it has neither the framework nor, mostly, the growing conditions it would need.
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What separates a copy from a recombination
A cutting is the same plant continued. A seed is two parents recombined. Everything that differs between the two routes follows from that one distinction.
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What the plant measures, and it is not the day
Flowering is triggered by uninterrupted darkness, not by day length. The distinction sounds pedantic until a light leak costs a grower a crop.
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Why one packet of seeds gives different plants
Siblings from the same cross are not copies of each other. What varies, why it varies, and what a grower does with the ones that came out wrong.
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Why the top layer decides the yield
Light falls off sharply with depth, so what grows below the canopy is worth a fraction of what grows in it. Every training technique exists to address that.
Varieties
The genetics, the origins, and the names given to them.
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A modern lineage, better documented than most
This family emerged recently enough that its history was recorded as it happened. That makes it unusual, and it shows what documentation could look like.
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A mountain range, and what the word came to mean
The name points at a real place with a real growing tradition. What it signals commercially today has drifted a long way from that origin.
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A name that promises a smell, and can be checked
Most variety names predict nothing. This one names an aroma, which makes it one of the few claims a terpene profile can actually confirm or refute.
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A name with a disputed origin story
Two accounts circulate about where this line came from, neither is documented, and the name now covers material that varies widely between sellers.
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Cold nights, and a pigment that was always there
The colour is not added, not a sign of potency, and not a variety in itself. It is a pigment class expressed in response to temperature.
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How a plant was selected to stay compliant
The enzyme that decides between two branches is inherited in a way that made this selection possible. That single fact built an entire agricultural sector.
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Long flowering, and why that mattered
This family takes far longer to finish than commercial cultivation prefers. That single trait explains its history, its price and its near-disappearance.
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The variety that defined a decade
Released in the mid-nineties, it set the visual standard for what a resinous flower should look like. Its lineage is better documented than most.
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What a dessert name signals about a market
A generation of varieties named after confectionery. The naming convention is itself information about how this market decided to sell things.
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Who names these things, and on what basis
Nobody registers them, nobody verifies them, and the same name covers different genetics at different sellers. Here is what a name does and does not guarantee.
Culture and history
The people, the places and the episodes.
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A mountain region and its farm economy
Thin soils, steep slopes, and few crops that pay. The agricultural history of northern Morocco explains more about this subject than any amount of romanticism.
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A Parisian circle and what remains of it
A psychiatrist's research group that writers attended, for five years in the 1840s. It left a literature read as reportage far more often than it should be.
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A tolerance that was never a legalisation
Dutch policy declined to prosecute retail sale under conditions, and left supply illegal. That contradiction went unresolved for four decades.
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Rope and sail, and what a fleet needed
A maritime state depended on a fibre it mostly could not grow. The Portuguese case shows what that dependency cost and what was built to escape it.
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The activist whose book started a movement
A self-published book from 1985 shaped how a generation argued about this plant. What it got right, what it got wrong, and why both still circulate.
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What this fibre actually made
Rope, canvas, and paper made from rags rather than from the plant. The famous yield figure comes from a real bulletin that said something narrower.
In practice
What to do with it once you have bought it.
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Three things to check before anything else
Three verifiable explanations for a product that seems different from before. The fourth explanation is a medical question and is not on this page.
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What smell can judge, and what it cannot
The nose detects things no certificate records, and it establishes nothing the certificate covers. Knowing which is which is the whole of the skill.
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Why particle size matters more than it seems
Grinding changes surface area, and surface area governs how fast everything happens. It also decides what stays in the machine rather than in your hand.