
Rockstar Feminised
Grow Rockstar Feminised in Ireland. Hybrid genetics testing at 18% THC. Known for happy, relaxed, sleepy effects. Ships discreetly nationwide with sourced grow figures.
Royal King Genetics — first-party test batch
Figures below are from our internal seed-lot QC and verified Irish grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-10 on 100 seeds at 21-24°C.
About Rockstar Feminised
Growing Rockstar in Ireland is a question of rain and wind rather than of heat or latitude. The whole island runs temperate oceanic, so nowhere is meaningfully warmer than anywhere else — what changes as you move west is how many wet days land on the plant while it is in flower. Outdoors that makes bud structure and the 56-63 days of bloom the two things worth reading before anything else, because a dense cola and a wet October are a poor combination. Under a tunnel or under lights the argument disappears: Rockstar is then judged on its genetics and on nothing else.
Growing it on this island
The pressures here are consistent and they are nearly all about water. Botrytis in dense flower from September onwards is the first, and it is answered with open structure, moving air and a roof — not with anything sprayed on afterwards. Indoors, spider mite and thrips arrive the way they always do, and humidity above 60% in late bloom is what turns a manageable problem into a lost room. Outdoors in a wet spring the slugs do more damage to seedlings than every insect on the plot, and they do it in a single night.
A polytunnel changes the arithmetic on Rockstar more than any other single purchase. It adds a fortnight at both ends of the season, keeps the rain off the flower during the weeks that matter, and turns a marginal outdoor crop into a reliable one.
Flavour, aroma and effect
Rockstar arrives in order. The first draw at 18% THC gives peppercorn heat that lands at the back of the throat. The happy, relaxed, sleepy character follows in minutes, as head and body together. Thinking stays clear while the muscles let go by degrees, which is what makes the dose, rather than the genetics, the thing that decides the evening. Limonene underneath contributes a lift that stops it going heavy.
Terpene breakdown
Primary: Caryophyllene · Secondary: Limonene · Tertiary: Myrcene. The three shift relative to each other across the cure. Straight off the dry the caryophyllene dominates; three or four weeks sealed in glass at 16-18°C and the myrcene underneath comes up to meet it. Vaporising between 180°C and 195°C catches the widest span, because heat takes the lighter myrcene molecules first.
Who it suits
Who does well with Rockstar? Indoor growers who want to choose their own timeline. Tunnel growers who want to decide when flowering starts rather than letting August decide it. Anyone with the space to veg it properly first. Rated intermediate, which means a moderate learning curve that rewards attention without needing specialist kit.
Effects
Best For
Strain Type
Strain Data Sheet
Packaging
Feminised Premium
Seeds
authenticity
lining
number
Related Strains

Sugar Cookie Feminised
Grow Sugar Cookie Feminised in Ireland. Hybrid genetics testing at 23% THC. Known for happy, relaxed, sleepy effects. Ships discreetly nationwide with sourced grow figures.

Biochem Feminised
Grow Biochem Feminised in Ireland. Indica genetics testing at 21% THC. Known for relaxed, sleepy, happy effects. Ships discreetly nationwide with sourced grow figures.

Star Berry Feminised
Star Berry Feminised cannabis seeds for Irish growers. Indica strain · 21% THC · relaxed, sleepy, happy. Discreet packaging, nationwide delivery, sourced grow figures.

Gatekeeper OG Feminised
Order Gatekeeper OG Feminised seeds online in Ireland. A quality hybrid cultivar at 22% THC delivering euphoric, calm. Chosen for a short season and a damp finish. Fast shipping and a germination guarantee.
Rockstar 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.
A late-2010s cross stabilised over four generations of selection. Rockstar grows true-to-type with the cross-derived trait balance that defines the cultivar.
Cull off-type phenos in Rockstar through filial selection.
Chosen for hybrid frame, clean terpene expression and consistent yield across the population.
Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.