
Casper OG Feminised
Grow Casper OG Feminised in the UK. Indica genetics at 16% THC, known for euphoric, uplifted, calm effects.
Royal King Genetics — first-party test batch
Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-06 on 200 seeds.
About Casper OG Feminised
Cured properly and opened cold, Casper OG leads with caryophyllene: dry black pepper that catches at the back of the throat, clove and warm wood underneath it. Underneath it myrcene adds depth and weight low down in the profile, and it reads mid-palate rather than on the first pass. This 71/29 indica tests at 16% THC, but potency is the least interesting number here: what separates Casper OG from the others on the same shelf is how the aroma behaves across a cure, and that is a question of storage and patience rather than genetics alone.
Growing it for the nose rather than the scales
Chasing terpene expression in Casper OG pulls against chasing yield, and it is worth knowing which one you are doing before you start. The Caryophyllene/Myrcene/Bisabolol profile does its best work in living soil, where the microbial side produces secondary compounds a bottle cannot. That is easier here than it sounds: decent peat-free compost and worm castings are a garden centre purchase in most British towns.
Through the 63-70 days indoors of bloom, stop foliar spraying after week two — anything landing on developing trichomes is still there at harvest and you will taste it. The final three weeks decide which terpenes dominate the cured flower: nights held at 16-18°C push caryophyllene forward, while a warmer finish protects the lighter bisabolol notes at the top.
The cure is where most of the flavour is lost in this country, and the reason is the weather. A 10-14 day hang wants 15-18°C at 55-60% relative humidity, which a British autumn will not give you in a spare room — a temperature-controlled cupboard or a wine fridge set to 16°C solves it for the price of one wasted harvest. Then into glass, burped twice a day for the first fortnight. The myrcene layer that makes this one worth growing does not appear until somewhere between weeks three and four in the jar.
Flowering: 63-70 days indoors. Indoor yield: 30 g/m². Outdoor yield: 400 g/plant. Rated intermediate difficulty.
Flavour, aroma and effect
Casper OG arrives in stages. The first draw at 16% THC brings dry pepper that registers at the back of the throat. The euphoric, uplifted, calm character follows within minutes, starting as weight behind the eyes and working down through the shoulders and chest. By about a quarter of an hour it has become a physical stillness — not sedation so much as a strong disinclination to get up. Two to three hours at a moderate dose. The myrcene underneath adds body and depth beneath the rest.
Terpene breakdown
Primary: Caryophyllene · Secondary: Myrcene · Tertiary: Bisabolol. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188°C, keeps the myrcene and bisabolol audible over the caryophyllene base. Run it hotter, or burn it, and the three collapse into one note — pleasant enough, but none of the complexity that made it worth choosing.
Who it suits
Who does well with Casper OG? Indoor growers who want the timeline under their own control. Outdoor growers who want to choose when flowering starts. Anyone with the room and the patience to veg it properly before flipping. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.
Effects
Strain Type
Strain Data Sheet
Packaging
Feminised Premium
Seeds
authenticity
lining
number
Related Strains

Afghan Big Bud Feminised
Afghan Big Bud Feminised — hybrid cannabis seeds suited to UK growing conditions. 20% THC with focused, calm effects. Fast, discreet UK delivery.

Puna Budder Auto
Puna Budder Auto cannabis seeds for UK growers. Indica · 18% THC · relaxed, euphoric, creative. Discreet UK delivery, priced in GBP.

Champagne Kush Feminised
Champagne Kush Feminised seeds. A hybrid cultivar at 15% THC delivering happy, talkative, uplifted. Grow figures from named sources.

Nightcap Feminised
Nightcap Feminised — indica cannabis seeds suited to UK growing conditions. 22% THC with relaxed, focused, calm effects. Fast, discreet UK delivery.
Casper OG Feminised — Breeder Information
Royal King GeneticsBred and stabilised in-house by Royal King Genetics — our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read the full breeding process and about page.
Casper OG has been the target of countless seed-bank backcross programmes. Ours is BX3 — three rounds of crossing the elite cut back to the parental line until trait expression evened out. The pack grows true to the mother cut.
Recreate the Casper OG clone-only cut in stable seed form.
Chosen for purple/dark expression where it shows, dense bud structure and a true indica relaxation profile.
Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.