Stabilised genetics. Documented openly for every UK grower.
Every strain we ship into the UK comes with a breeder-documented genetics reference, aggregating publicly-reported lab data, breeder specifications, and grower-community results. These are reference benchmarks for the stabilised line. Pick any strain in the catalogue below to see the reference behind your seeds.
What “genetics reference” means here
Three documentation sources combined into one reference benchmark — published openly so UK growers know exactly what they're paying for before the seeds hit the medium.
Climate-Tuned Stabilisation
Every line on this page has been carried through at least three filial generations of phenotype-driven selection — F3, F4, F5, IBL, or BX — with twelve mother plants per cycle. Lines are screened against the realities UK growers face: a short outdoor window from roughly April to October, cool summers, and the damp late-season conditions that make mould resistance and a fast finish matter more here than raw yield potential. What you grow expresses the genetics you bought.
Reference Benchmarks
Each genetics reference aggregates breeder-published specifications, publicly-reported third-party lab data for the strain family, and grower-community results — cannabinoid ranges, terpene profile, and an 8-category safety summary. These are reference benchmarks for the stabilised line, NOT independent ISO/IEC 17025 certificates of analysis for the specific seed lot you receive.
Breeder Documentation
The Royal King Genetics breeding team documents every line — selection criteria, breeding objective, cohort variation envelope. The narrative on each report comes from the team that bred the line, not pulled from public seed databases alone.
What a genetics reference tells you
- ✓Reference header — strain identity, reference batch ID, and breeder documentation
- ✓Cannabinoid profile — THCa, Δ9-THC, CBDa, CBD, CBG, CBC, CBN reference ranges
- ✓Terpene profile — top 5–8 terpenes with %, mg/g, and aroma notes
- ✓Safety category summary aggregated from publicly-reported lab data
- ✓Phenotype consistency bar showing the cohort variation envelope
- ✓Stabilisation status with our trait-locking criteria checklist
- ✓Expected grow outcomes — flowering window, indoor and outdoor yield, plant height
- ✓Breeder byline — Royal King Genetics breeding team documentation
Where our flowering and yield figures come from
Every flowering time and yield figure on this site is taken from a published source and carries the page it was read from — the originating breeder where possible, otherwise a reputable strain database. We hold sourced flowering times for about 90% of the catalogue and indoor yields for about 69%.
What matters as much is what we do with the rest. Where nothing is published for a strain, the page shows nothing, or shows a range for that strain type clearly marked “typical”. It is not filled in with an invented number, and it is not padded with a figure borrowed from a similar variety. Published yields are also produced under the breeder's conditions, not yours — treat them as the ceiling of a well-run indoor grow rather than a forecast.
Browse our verified catalogue
Amnesia Haze Feminised
OG Kush Feminised
Granddaddy Purple Feminised
G13 Feminised
Forbidden Fruit Feminised
Fruity Pebbles Feminised
Hindu Kush Feminised
A-10 Auto
Acapulco Gold Auto
Afghan Big Bud Feminised
Puna Budder Auto
Champagne Kush Feminised
Nightcap Feminised
Wilson Auto
X-Wing Feminised
Goldberry Feminised
Ecto Cooler Feminised
Doobiebird Daydream Feminised
Dosi Punch Feminised
Purple Arrow Feminised
A-Train Feminised
Rocky Mountain Blueberry Feminised
UK Cheese Feminised
Allen Wrench Feminised
A working genetics company. Documented for the UK.
Royal King Seeds isn't a re-bagged catalogue. Every strain on this page comes from our breeding floor, stabilised and documented by the same team. The references you see here aggregate breeder specifications, publicly-reported third-party lab data, and grower-community results — they're reference benchmarks for the stabilised line, not independent per-lot certificates of analysis, published openly so UK growers know exactly what they're paying for.