Uniformity describes how similar the plants from one seed batch are: in height, structure, flowering time, aroma and cannabinoid profile. It is measured by growing many plants under the same conditions and looking at the spread.
In practice
Uniform seed is worth a lot to growers running a sea of green or a commercial room: plants finish together, fill the canopy evenly and test alike. Two routes give it. An F1 between two different inbred lines is uniform because every seed gets the same pair of genotypes. An IBL is uniform because its plants are highly homozygous.
Most cannabis seed is neither, so variation is normal. Breeders describing uniformity should quantify it from tester grows: "flowering time 56 to 63 days across 40 plants" says more than "very uniform".
Uniformity is not quality, and not always a goal. Preservation seed lines and landraces keep variation on purpose, because diversity is what lets a population adapt and gives later breeders something to select from.
Don't confuse with
- True breeding: offspring match parents over generations; an F1 can be uniform without breeding true.
- Stability of sex: a uniform line can still carry a herm problem.
A seed run is a dedicated grow in which selected parents are crossed to produce a batch of seed, as opposed to growing for flower.SOG (sea of green) grows many small plants at high density with little or no veg time, each making one main cola, to shorten the cycle.F1 is the first generation of offspring from crossing two parents; if the parents are inbred and different, F1 plants are uniform and often show hybrid vigour.Inbreeding is mating between related plants, which raises homozygosity; an inbred line is the resulting population, measured by the inbreeding coefficient F.A plant is homozygous at a locus when it carries two identical alleles there (AA or aa), so it passes the same allele to every offspring.The dry, single-seeded fruit of cannabis that growers call a seed; a hard shell (pericarp plus seed coat) encloses one embryo and does not split open.A landrace is a traditional, locally adapted cannabis population kept by farmers in one region over many generations, with its own type and plenty of internal variation.A true-breeding line produces offspring that consistently look like the parents for a given trait, because the plants are homozygous for the alleles behind it.An IBL (inbred line) is a seed line that has been inbred and selected over many generations until it breeds true for its main traits, giving uniform offspring.Stabilisation is breeding a seed line over several generations, with selection each time, until it reliably reproduces the chosen traits from seed.A test grow (tester grow) is growing out a sample of a new seed line, often by several independent growers, to measure uniformity, vigour, chemistry and herm rate before release.
