CBD Seeds Compared Stage by Stage: Balanced Versus Dominant

Put two packs of CBD seeds beside each other, one marked 1:1 and the other 20:1, and they look the same: the same brand packaging, same seed count, seeds which no eye can separate apart. Run them in the same tent and they go their separate ways from the first step and never converge again. The reason is one single gene, and the easiest way to see what it does is to track the two packs through each step both go through: the breeding that made them, the seed, the seedling, the flowering room, the cut, the jar, the lab bench and the law. The ratios used as reference points throughout are drawn from the range at https://calmcbdseeds.com, and that range runs 1:1, 2:1 and 20:1 with a top line at around 30 to one; the genetics holds the same whichever shop the seeds came from.

Stage One: At the Breeder’s Bench

Cannabis decides whether it will produce THC or CBD at one locus on the genome. The gene there comes in two versions: one codes the enzyme that converts the shared precursor into THCA, the other the enzyme that turns it into CBDA. Every plant carries two copies, one inherited from each parent, and the pair fixes the chemotype. Two THC copies make a THC-dominant plant. Two CBD copies make a CBD-dominant one. One of each gives a balanced plant, since the two versions are codominant and neither silences the other.

The balanced pack was made by crossing two balanced plants, each carrying one copy of each form. The CBD-dominant pack was made by pairing two plants which each hold two CBD copies and not a single THC copy in either of them. This one difference at the cross determines everything afterwards, and the difference is already inside the seed long before it is packed.

Stage Two: Inside the Seed

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, around two CBD-dominant seeds, and five genuine balanced ones. The pack is sold by its parents, and in the case of half its contents the label is accurate; for the other half it does not. Calm CBD Seeds prints the expected split on each balanced line, which means the buyer knows ahead of planting that a portion of the plants are going to differ from the headline ratio.

The CBD-dominant pack has no such spread. Each seed received a CBD copy from each parents, every plant is going to be CBD-dominant, and the ratio on the foil applies to all of them, within the ordinary variation in how total cannabinoid any individual plant builds. Breeders describe these lines “breed true” for chemotype; the phrase refers to exactly this lack of surprise.

Weeks One to Four

At this stage the two packs look the same once more, and the likeness lasts further than most growers assume. Chemotype leaves no trace on a seedling. Leaf shape, vigour, stem spacing and the speed of growth rate are controlled by other genes altogether, and the three kinds of plant in the balanced pack come up indistinguishably beside one another and from each plant in the CBD-dominant pack.

One real difference at this stage comes from ancestry not chemotype. Lines with recent hemp ancestry, and that includes some less developed CBD-dominant strains, tend to grow taller and branch less. A well-worked 20:1 strain grows like any indoor hybrid; a young one may still carry the field in its shape. Neither tendency tells a thing about the ratio to come.

When the Resin Comes In

In flower the two packs start to offer hints, and most of them point the wrong way. Resin density is the first thing a grower reads, and it used to be a reasonable rule: early CBD-dominant strains carried visibly less frost than their THC cousins, a inheritance from hemp. Modern lines have largely closed that gap, and a lightly frosted plant from the CBD-dominant pack may perfectly well come in precisely where the foil said. Trichome density and chemotype are inherited on separate genes.

Smell is an even poorer guide. The terpene chemistry lives on still other genes, so the THC-dominant plant hiding in the balanced pack can be identical to the balanced one next to it, and both can smell identical to a plant from the CBD-dominant pack. Growers who try to separate a balanced pack by nose in week eight are guessing, which is not better than not unsorted at all.

Stage Five: The Harvest Window

Here the two packs differ in a way that benefits the grower of the CBD-dominant pack and the CBD-dominant plants hidden in the balanced pack. CBDA breaks down more slowly than THCA, so a CBD-dominant plant left a week beyond its ideal point retains the bulk of its cannabinoid load, whereas a THC-dominant one under the same neglect has already begun converting THC into CBN. The usual trichome rules nonetheless holds; it holds because the terpenes, which fade on every plant whatever the chemotype, and a late, over-dried CBD flower tastes of very little whatever the test result says.

What Mixing Does

The CBD-dominant pack can go into one jar. Each plant in it carries about the same ratio, and blending them changes nothing anyone would notice. The balanced pack cannot be treated the same way. Blend its 10 plants in a single jar and the contents is a ratio that no foil could have promised, skewed by whichever plants yielded most, and nothing on a later test can untangle what went in.

The habit that saves the grief is almost tedious: harvest the balanced pack plant by plant, cure each apart, number them, and try them one at a time before the crop is mixed. It is the only point in the entire process at which the different kinds of plant in the balanced pack can still be kept apart without a lab, and only because every one is still in its own bag.

Stage Seven: The Lab Report

Submit a few grams from every jar to a laboratory and the two packs finally become legible. For the CBD-dominant pack the reports come back grouped closely around the stated ratio, varying mainly in total output not in balance. For the balanced pack they come back in three groups: some reports with nearly all THC, a few with nearly all CBD, and the majority somewhere near one to one. No part of that result is a failure; it is the bench cross written out as numbers.

Over-the-counter test kits are sold for growers without a laboratory, and most detect whether THC is present rather than how much. That is sufficient to pull the THC-dominant plants out from a balanced pack and not enough to assign a ratio to the rest, which suits the commonest need: knowing which of the 10 jars is going to catch out a guest.

Where the Law Reads the Numbers

The last place where the two packs separate is in law, and it trips growers who assumed “CBD” was shorthand for “hemp”. The majority of countries define hemp by a THC ceiling, a fraction of a percent of dry weight, and the exact figure differing from country and over time. A plant from the CBD-dominant pack producing twenty percent CBD at twenty to one at the same time makes about one percent THC, and that is many times over the majority of limits. Compliant lines are selected to hold total cannabinoid content low so the THC fraction remains below the line right up to harvest; CBD seed lines are bred for high content and allow the THC scale with it. A seller that gives only a ratio is selling a flower line; anyone who requires a legal hemp crop should look for a tested THC figure at harvest and order nothing that cannot show one.

Beyond the threshold issue, the chemotype alters very little about the law on the seed as such. Where holding cannabis seeds is permitted and germinating them is not, the balanced pack and the CBD-dominant pack sit under the same rule as any other pack. Where the plant is legal outright, the decision between them is the grower’s and nothing else’s. No part of this article is legal advice, and the rule which applies is the one in the place the seed will be sown, rather than the one where it was sold.