One Tent, Two CBD Packs

Place two packs of CBD seeds beside each other, one labelled 1:1 and the other 20:1, and the two look the same: same breeder’s packaging, same seed count, contents which no eye can tell apart. Grow them side by side and they part ways at the very first step and never converge again. The cause is one single gene, and the clearest way to understand what it does is to follow the two packs through each step they share: the cross that made them, the seed, the seedling, the flower tent, the cut, the jar, the lab bench and the border. The lines used as examples below are drawn from the range at https://calmcbdseeds.com, which goes 1:1, 2:1 and 20:1 with a highest line at about 30 to one; the biology holds the same whichever shop the packs come from.

How Each Pack Was Made

Cannabis settles whether it will make THC or CBD at one position on the genome. The gene there comes in two versions: one codes the enzyme that converts the shared starting molecule into THCA, the other the enzyme that turns it into CBDA. Every plant holds two copies, one received from each parent, and the pair fixes the chemotype. Two THC copies give a THC-dominant plant. Two CBD copies give a CBD-dominant one. One of each gives a balanced plant, because the two versions are codominant and not one of them silences the other.

The balanced pack was made by pairing two balanced plants, each carrying one copy of each form. The CBD-dominant pack was made by crossing two plants that both carry two CBD copies and not a single THC copy between them. This one fact at the cross determines all that follows afterwards, and the difference is already in the seed long before it is put in the foil.

The Mendelian Split

Cross two balanced plants and the seeds sort themselves by the simplest arithmetic in genetics: a quarter inherit two THC copies, a quarter get two CBD copies, half inherit one of each. In a pack of 10 seeds that works out to, on average, around two THC-dominant seeds, two or three CBD-dominant ones, and about five true balanced seeds. The pack is labelled by its parents, and in the case of half its contents the label fits; in the case of the other half it does not. Calm CBD Seeds prints the expected split on each balanced pack, which means the buyer knows before planting that a portion of the plants are going to depart from the headline ratio.

The CBD-dominant pack has no such split. Every seed got a CBD copy from each parent, each plant is going to be CBD-dominant, and the ratio on the foil holds to every one of them, within the ordinary differences in how total cannabinoid an individual plant produces. Breeders say such lines « breed true » for chemotype; the phrase means precisely this absence of surprise.

Weeks One to Four

Here the two packs appear alike again, and the likeness holds longer than many growers assume. Chemotype leaves no mark on a seedling. Leaf, vigour, internode length and growth are controlled by different genes altogether, and the three kinds of plant in the balanced pack come up indistinguishably from one another and from every plant in the CBD-dominant pack.

One practical distinction during this stage arises from lineage not chemotype. Lines with strong hemp ancestry, which includes a number of older CBD-dominant strains, are inclined to grow rangier and fill out less. A heavily selected 20:1 strain behaves like a normal modern hybrid; a early-generation one still carry the hemp in its frame. Neither habit tells anything about the ratio to come.

Stage Four: The Flowering Room

In flower the two packs start to give hints, and most of the clues mislead. Trichome coverage is the first thing a grower reads, and it was a fair guide: first-generation CBD-dominant strains carried markedly less frost than their THC cousins, an unwanted legacy from hemp. Modern lines have largely closed that gap, and a lightly frosted plant from the CBD-dominant pack can perfectly well test exactly where the foil said. Resin density and chemotype are inherited separately.

Smell is an even poorer guide. The terpene chemistry lives on still other genes, so the THC-dominant plant sitting in the balanced pack can be identical to the balanced one next to it, and either can smell indistinguishable to a plant from the CBD-dominant pack. People who try to separate a balanced pack by nose at week eight are guessing, and that is no any better than leaving the plants unsorted at all.

One Place CBD Is More Forgiving

Here the two packs differ in a way that benefits the grower of the CBD-dominant pack and also the CBD-dominant plants hidden in the balanced pack. CBDA breaks down more slowly than THCA, so a CBD-dominant plant allowed a week past its ideal point retains most of its cannabinoid content, where a THC-dominant one in the same neglect has already started shedding THC into CBN. The usual trichome rules nonetheless holds; it holds on account of the terpenes, which fade on every plant regardless the chemotype, and a late, rushed CBD flower smells of very little whatever the test result says.

Why Each Plant Gets Its Own Label

The CBD-dominant pack goes into one jar. Every plant in it carries roughly the same ratio, and blending them alters nothing worth measuring. The balanced pack cannot be treated that way. Pool its 10 plants into a single jar and the contents is a ratio that nobody’s foil ever promised, skewed by which plants grew biggest, and nothing on a subsequent test can untangle what went in.

The habit that saves the grief is dull: harvest the balanced pack plant by plant, dry every one separately, label them, and test them plant at a time before anything is combined. It is the only stage in the whole process at which the three kinds of plant in the balanced pack can still be told apart without a laboratory, and then only for the reason that each is at that moment in its own container.

Stage Seven: The Lab Report

Submit a few grams from every jar to a laboratory and the two packs finally are legible. For the CBD-dominant pack the reports come back grouped tightly near the stated ratio, varying mainly in total cannabinoid content rather than in balance. For the balanced pack they arrive back in three groups: a few reports showing almost all THC, some with almost all CBD, and the majority sitting around one to one. Nothing of this pattern is a failure; it is the breeder’s cross expressed as numbers.

Home test kits exist for growers without a laboratory, and most show whether THC is present rather than how much. That is sufficient to separate the THC-dominant jars away of a balanced pack and not enough to put a ratio to the others, which matches the commonest need: finding out which of the ten jars will surprise someone.

Stage Eight: The Border

The last stage at which the two packs diverge is in law, and it trips growers who thought « CBD » meant « hemp ». The majority of jurisdictions classify hemp by a THC ceiling, a small fraction of a percent of dry weight, with the exact number varying by country and sometimes year to year. A plant from the CBD-dominant pack producing twenty percent CBD at twenty to one also produces around one percent THC, which is many times above the majority of limits. Compliant lines are selected to hold total cannabinoid output low so the THC fraction remains below the line right up to maturity; CBD flower lines are bred for rich content and let the THC scale with it. A seller that offers only a ratio is selling a flower line; a grower who needs a legal hemp crop should ask for a tested THC figure at maturity and buy nothing that cannot show one.

Past the threshold issue, the chemotype changes nothing about the law on the seed itself. In places where holding cannabis seeds is lawful and germinating them is not, the balanced pack and the CBD-dominant pack sit under the same position as any other pack. In places where the plant is legal outright, the decision between them is a matter of preference and nobody else’s. No part of this page is legal advice, and the rule that counts is the one where the seed is going to be grown, rather than the one in the place it was sold.