Grapefruit Kush cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 21%
🎨 Creative
IndicaFeminisedIn Stock

Grapefruit Kush Feminised

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

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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 2026-09-14 on 450 seeds at 21-24°C.

Germination rate: 96.6% (n=450)
Last QC test date: 2026-09-14
Indoor yield: 483-624 g/m² (avg across 15 verified grower reports)
Outdoor yield, Ireland: 425-628 g/plant (avg across 6 verified grower reports)

About Grapefruit Kush Feminised

Does Grapefruit Kush finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. A compact 70/30 plant is easier to shelter and easier to hide, though the density that makes it worth growing is also what holds water after rain. Bloom takes 55 days (indoor), so the harvest date is set by the calendar far more than by your technique.

What should I expect to take off it? Up to 600g per m2 indoors and Up to 700g per plant outdoors are the published figures, and both assume a full light or a full season plus a root run to match. A tunnel gets you most of the way to the outdoor number; a windowsill will not. At 21% THC the effort is well spent either way.

Is it a sensible first grow? Reasonably. Anyone who has finished one grow will manage this one; it asks for consistency rather than expertise.

Other questions that come up about Grapefruit Kush

Soil or coco? Coco with fertigation at EC 1.4-1.8 through bloom if you are there daily and want speed. Peat-free soil with slow amendments — fish, blood and bone, seaweed meal, rock phosphate — if you are not, and want flavour. Both suit this indica; the deciding factor is your week, not the plant.

How does it handle the weather here? The dense canopy shades itself, which is useful on the handful of genuinely warm days and a liability in a wet week. Mulch the root zone, water early, and keep air moving underneath.

When does bloom feed start? Within a week of the first pistils. The 70/30 balance shifts demand quickly at the transition — phosphorus and potassium up, nitrogen down. Soil growers top-dress; coco and hydro switch formula immediately.

Tunnel, outdoors or indoors? A tunnel is the best value of the three here. Indoors you own the 55 days (indoor) of bloom completely; outdoors the plant gets light no lamp matches and can reach Up to 700g per plant, and pays for it in rain. Flowering: 55 days (indoor). Indoor yield: Up to 600g per m2. Outdoor yield: Up to 700g per plant. Plant height: Medium. Rated easy difficulty.

Flavour, aroma and effect

Grapefruit Kush arrives in order. The first draw at 21% THC gives earth and musk, coating rather than sharp. The energetic, happy, relaxed character follows in minutes, as weight behind the eyes that works down through the shoulders. By a quarter of an hour it reads as physical stillness rather than sedation — a strong disinclination to stand up. Two to three hours at a sensible dose. Caryophyllene underneath contributes warmth that keeps it anchored.

Terpene breakdown

Primary: Myrcene · Secondary: Caryophyllene · Tertiary: Linalool. This is a combination that turns up repeatedly in cultivars people rate, and it is usually what gets commented on when a jar is opened for the first time after a proper cure. Myrcene anchors it, caryophyllene holds the middle, and linalool sits behind both — the last of those being what separates this from other strains leading on the same terpene.

Who it suits

Who does well with Grapefruit Kush? 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 easy, which means a moderate learning curve that rewards attention without needing specialist kit.

Effects

🤑Energetic
71% of people reported feeling Energetic
😊Happy
65% of people reported feeling Happy
😌Relaxed
58% of people reported feeling Relaxed
😴Sleepy
58% of people reported feeling Sleepy
🤤Hungry
48% of people reported feeling Hungry
🤗Euphoric
40% of people reported feeling Euphoric
🧘Calm
33% of people reported feeling Calm
🌿Stress Relief
20% of people reported feeling Stress Relief
💆Body High
17% of people reported feeling Body High

Best For

✦ Anytime
✦ Insomnia
✦ Muscle Spasms
✦ Stress

Strain Type

Indica 70%Sativa 30%

Strain Data Sheet

🧬THC21% - 24% (High)
🌿LineageBC Kush × Grapefruit
🔬TypeFeminised Indica
🌡ClimateCool–temperate / continental
📅HarvestSept – Nov, S. hemisphere (typical)
📏HeightMedium
⚖️YieldTypical for type
🏠Yield IndoorUp to 600g per m2
🌳Yield OutdoorUp to 700g per plant
⏱Flowering Time55 days (indoor)

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers are responsible for complying with the law where they live.
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Grapefruit Kush Feminised
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🛡️Aluminium interior lining
🏷️Protective sticker
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🔢Scratchable serial number

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Grapefruit Kush Feminised — Breeder Information

Royal King Genetics

Bred 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.

Stabilisation Level
BX3
Generations
4+
Breeding Programme
Three-Generation Backcross Programme — recurrent-parent fixing
Stabilisation Notes — What This Means for Your Grow

Three rounds of backcrossing to the parental line have welded the Grapefruit Kush cut into the population. The resin density that made the original mother famous now expresses across the whole pack — not just in one or two lucky phenos.

Breeding Goal

Recreate the Grapefruit Kush clone-only cut in stable seed form.

Selection Focus

Chosen for resin output, a low-slung stature and a clean indica terpene fingerprint.

Pollen / Mother Source

Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.

Last Batch QC Verified
17 September 2026· 99%+ germination