Cultivars from the library
Four of the lines documented in the strain library. Each profile carries the lineage we worked from, the observed ranges, and the growing notes behind them.
Royal King Genetics — in-house breeding team
The protocol every cultivar goes through, what we document for each line, what the release-batch test measures — and, at the bottom of this page, what we have not published yet.
Cannabis breeding has two paths. One is chasing trends: drop a hyped F1 cross, ride the marketing wave, move on before the instability shows up in someone else's tent.
We took the other path. Royal King Genetics works proven cultivars — the Blue Dreams, White Widows, OG Kushes, Gorilla Glues and Wedding Cakes growers keep coming back to — and locks selected phenotypes into reproducible seed lines.
We did not invent White Widow. The claim we make is narrower and more useful: we have stabilised our selection of it, we publish the lineage we worked from, and we publish observed ranges rather than single flattering numbers. Where a cultivar originated with another breeder, the strain page says so.
What follows is the protocol. Where a section rests on data, the data is shown; where it does not, the page says that too.
Same protocol for every project, from starting population to a lot that is cleared for a store.
A project starts by popping a population of a target cultivar — typically 50–200 seeds — under identical conditions: same medium, same feed, same light cycle, same VPD. Identical conditions are the whole point; phenotypes cannot be compared fairly across different rooms.
Each plant is logged through veg and flower for vigour, internode spacing, structure, branching, leaf morphology, flowering time, aroma, resin production, and finished flower density. What gets recorded is what we can later be held to.
We cull hard. What advances is the phenotype that matches the cultivar's reference profile — the Blue Dream that actually smells and finishes like Blue Dream — not the one that photographs best.
Criteria are weighted across terpene profile, vigour, structural consistency, flowering time, and yield potential. A pheno with a perfect nose and a poor yield does not advance; neither does a heavy yielder that is off-type on aroma.
The selected phenotype is crossed back to the parental line over successive generations — BX1, BX2, BX3 and further where a trait is still segregating. Each generation narrows the spread of the population.
A line is only called stabilised when the population expresses the target traits consistently: finish times cluster in a tight window rather than scattering, aroma runs true across the population, and flower structure holds. Consistency here is a matter of degree, measured against what we logged — not a promise that every plant is identical. Segregation and outliers still occur in any seed population.
Before a batch is allocated to a store, a final grow-out from the production lot checks that traits have not drifted, and the lot is germination-tested against a 95% floor. Batches that miss the floor are pulled rather than discounted.
The guarantee that follows the batch is conditional, not unconditional: it applies to seeds germinated by the required paper-towel method, within the storage window, with the evidence listed in the terms. The full method, thresholds, claim window and exclusions are on the germination guarantee page.
Germination is tested by the paper-towel method at 20–25 °C in darkness with RO or filtered water, and a seed is scored as germinated only when it pushes a visible taproot within 72 hours. Seeds that crack without a taproot in that window count as failures.
95% is the floor a lot must clear to ship, and the threshold at which the replacement remedy applies — not a prediction of the rate you will see at home, where temperature stability and water quality move the result. Method, terms, evidence and exclusions: germination guarantee.
Four of the lines documented in the strain library. Each profile carries the lineage we worked from, the observed ranges, and the growing notes behind them.
Every cultivar in the library publishes the same fields: the lineage the line was worked from, the cannabinoid range, the flowering window, indoor and outdoor yield ranges, and a difficulty rating. They are ranges because phenotype and environment move them — a single number would be a marketing figure, not an observation.
| Cultivar | Lineage worked from | THC | Flowering | Indoor yield | Difficulty |
|---|---|---|---|---|---|
| Cherry Bomb | Hindu Kush × Northern Lights × Swiss Sativa | 15-19% | 7-9 weeks | 400-500 g/m² | beginner |
| Cookies and Cream | Starfighter × undisclosed GSC pheno | 20-25% | 9-10 weeks | 450-550 g/m² | intermediate |
| Cotton Candy Kush | Lavender × Power Plant | 17-22% | 8-9 weeks | 400-500 g/m² | beginner |
| Fire OG | OG Kush × San Fernando Valley OG Kush | 20-24% | 9 weeks | 450-550 g/m² | intermediate |
| Ghost OG | OG Kush phenotype (Chemdawg × Lemon Thai × Pakistani Kush) | 20-25% | 9 weeks | 450-550 g/m² | intermediate |
| GMO Cookies | Chemdawg × Girl Scout Cookies | 24-30% | 9-10 weeks | 500-600 g/m² | intermediate |
| Golden Pineapple | Golden Goat × Pineapple Kush | 15-20% | 8-9 weeks | 400-500 g/m² | beginner |
| Hempstar | Jack Herer × Four-Way × Skunk #1 | 14-18% | 10-11 weeks | 400-500 g/m² | intermediate |
| Jet Fuel | Aspen OG × High Country Diesel | 17-22% | 9-10 weeks | 400-500 g/m² | intermediate |
| Khalifa Kush | OG Kush phenotype (proprietary) | 24-28% | 8-9 weeks | 450-550 g/m² | intermediate |
| Lambs Bread | Jamaican landrace | 16-21% | 9-10 weeks | 400-500 g/m² | intermediate |
| Lemon Haze | Lemon Skunk × Silver Haze | 17-22% | 9-10 weeks | 450-550 g/m² | intermediate |
| MAC 1 | Alien Cookies × (Colombian × Starfighter F2) | 20-23% | 9-10 weeks | 450-550 g/m² | intermediate |
| Maui Wowie | Hawaiian landrace heritage | 17-20% | 9-10 weeks | 400-500 g/m² | beginner |
| Pineapple | Pineapple landrace heritage | 15-19% | 9-10 weeks | 400-500 g/m² | beginner |
| Rainbow | Blueberry × Dancehall | 15-19% | 9 weeks | 350-450 g/m² | beginner |
| Sour Tangie | East Coast Sour Diesel × Tangie | 19-22% | 9-10 weeks | 400-500 g/m² | intermediate |
| Strawberry | Strawberry Cough heritage | 15-19% | 8-9 weeks | 400-500 g/m² | beginner |
| Super Lemon Haze | Lemon Skunk × Super Silver Haze | 20-25% | 9-10 weeks | 500-600 g/m² | intermediate |
| Super Skunk | Skunk #1 × Afghani | 18-21% | 7-9 weeks | 450-550 g/m² | beginner |
| Tangerine Dream | G13 × Afghani × Neville's A5 Haze | 20-25% | 8-10 weeks | 450-550 g/m² | intermediate |
| Thai | Thai landrace | 17-22% | 11-13 weeks | 350-450 g/m² | advanced |
| The White | Unknown landrace heritage (Florida origin) | 20-28% | 8-9 weeks | 450-550 g/m² | intermediate |
| Tropicana Cherry | Tropicana Cookies × Cherry Cookies F3 | 20-26% | 9-10 weeks | 450-500 g/m² | intermediate |
| Watermelon | Original Watermelon (clone-only heritage) | 17-20% | 8-9 weeks | 400-500 g/m² | beginner |
25cultivars documented on this hub. Cannabinoid figures are breeder-documented ranges compiled from our own grow-outs and the source breeder's records; they are not a per-batch lab certificate for the pack you receive. Open the full library →
Selection and backcrossing narrow the spread of a population, so finish times cluster instead of scattering across three weeks. Outliers still happen; a tighter distribution is the claim, not a fixed date.
Published yields are ranges observed under documented conditions, not a number your room will hit. Your light, medium, feed, and training move the result more than the genetics do.
Terpene expression is where seed lines drift hardest, so it is weighted heavily in selection. Expect the profile to run true across the population — not for every plant to be a copy of the last.
A breeding claim is only worth the records behind it. These are the records this page does not yet show, stated plainly rather than implied by omission:
Until those are published, read the ranges on this site as documented observations, not as certified test results. We would rather say that than dress the gap up.
Reviewed by the Royal King Genetics team · August 2026. Corrections: contact us and we will amend the page.
Browse the documented library, or open the store for your market for current availability and local pricing.
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