# Stabilisation

> Stabilisation is breeding a seed line over several generations, with selection each time, until it reliably reproduces the chosen traits from seed.

- Canonical: https://genetixbay.com/knowledge/glossary/stabilisation.html
- Also written: stabilization, stabilising, stabilizing, stabilised, stabilized, line stabilisation
- Glossary category: Genetics and breeding · Evidence: Established
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Stabilisation is the work of taking a variable seed population and breeding it, generation by generation, until its seed reproduces the chosen traits reliably. Genetically, it means making the line [homozygous](https://genetixbay.com/knowledge/glossary/homozygous.md) at the loci behind those traits while culling defects along the way.

## In practice

A typical route: make an [F1](https://genetixbay.com/knowledge/glossary/f1.md), grow a large [F2](https://genetixbay.com/knowledge/glossary/f2.md), select the plants closest to the target, cross them (sib crossing), and repeat for [F3](https://genetixbay.com/knowledge/glossary/filial-generation.md), F4, F5 and beyond. [Backcrossing](https://genetixbay.com/knowledge/glossary/backcross.md) to a key parent or a few generations of careful selfing can speed it up. Each round needs enough plants to see what is still [segregating](https://genetixbay.com/knowledge/glossary/segregation.md), and strict culling for herms and weakness.

A line is "stable" for the traits that were selected and measured, not for everything. Ask what was stabilised: chemotype, flowering time, structure, aroma? How many plants were grown in the last generation, and what was the [herm rate](https://genetixbay.com/knowledge/glossary/herm-threshold.md)?

## Don't confuse with

- **A named cross**: a single F1 of two [hybrids](https://genetixbay.com/knowledge/glossary/hybrid.md) is not stabilised, whatever the pack says.
- **Uniformity**: a line can look uniform in one room and still segregate for traits not tested.
- **Clone-only**: a single genotype, perfectly stable as cuttings but not in seed form.

## Myth check

"Stable" without generation records and tester-grow data is a marketing word. See [backcrossing, IBLs and stabilisation](https://genetixbay.com/knowledge/breeding/backcrossing-ibl-stabilisation.md).

## Related terms

[IBL](https://genetixbay.com/knowledge/glossary/ibl.md), [True breeding](https://genetixbay.com/knowledge/glossary/true-breeding.md), [Homozygous](https://genetixbay.com/knowledge/glossary/homozygous.md), [Filial generation](https://genetixbay.com/knowledge/glossary/filial-generation.md), [Backcross](https://genetixbay.com/knowledge/glossary/backcross.md), [Uniformity](https://genetixbay.com/knowledge/glossary/uniformity.md)

## Read more

- [Backcrossing, IBLs and stabilisation](https://genetixbay.com/knowledge/breeding/backcrossing-ibl-stabilisation.md)

## Sources

1. Allard RW. 1999. Principles of Plant Breeding, 2nd edition. John Wiley & Sons, New York. ISBN 978-0-471-02309-0
2. Acquaah G. 2012. Principles of Plant Genetics and Breeding, 2nd edition. Wiley-Blackwell. https://doi.org/10.1002/9781118313718