Grapefruit Diesel cannabis seeds packaging — Royal King Seeds Ireland
Hybrid
THC 18%
🌙 Sleep Aid
HybridFeminisedIn Stock

Grapefruit Diesel Feminised

Grapefruit Diesel Feminised — premium hybrid cannabis seeds suited to Irish growing conditions. 18% THC with relaxed, sleepy, uplifted effects. Discreet delivery across Ireland, with sourced grow figures on every strain page.

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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 2026-09-05 on 325 seeds at 20-23°C.

Germination rate: 98.2% (n=325)
Last QC test date: 2026-09-05
Indoor yield: 422-556 g/m² (avg across 14 verified grower reports)
Outdoor yield, Ireland: 418-672 g/plant (avg across 5 verified grower reports)

About Grapefruit Diesel Feminised

Does Grapefruit Diesel finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. The 60/40 balance handles an Irish season without special treatment, which is most of the reason to choose it. Bloom takes 60 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 450g/m² indoors and Up to 550 gr 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 18% 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 Diesel

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 hybrid; the deciding factor is your week, not the plant.

How does it handle the weather here? Hybrid vigour covers most of what an Irish summer does. Keep the root zone under 28°C and do not transplant into a warm spell.

When does bloom feed start? Within a week of the first pistils. The 60/40 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 60 days (indoor) of bloom completely; outdoors the plant gets light no lamp matches and can reach Up to 550 gr, and pays for it in rain. Flowering: 60 days (indoor). Indoor yield: Up to 450g/m². Outdoor yield: Up to 550 gr. Plant height: Medium. Rated medium difficulty.

What Grapefruit Diesel is like in practice

The catalogue lists relaxed, sleepy, uplifted, and that matches what growers here report back. At 18% THC this hybrid sits where the balance is the argument for it. Small doses stay functional, larger ones relax properly, and the 60/40 split means the direction is set by the amount rather than fixed by the plant. The Caryophyllene and Myrcene together leave warmth and spice, drying on the exhale.

Suited to most occasions, with the dose doing the steering.

Terpene breakdown

Primary: Caryophyllene · Secondary: Myrcene · Tertiary: Humulene. Temperature decides how much of this profile survives. Low vaporisation at 180-188°C keeps myrcene and humulene audible over the caryophyllene; run it hotter, or burn it, and all three collapse into one note that is pleasant enough and tells you nothing.

Who it suits

Grapefruit Diesel suits growers with the fundamentals in place. Understand pH, rough nutrient ratios and a light cycle before committing to it; it asks for competence rather than expertise. Photoperiod genetics leave plant size and harvest date under your control — veg longer for a bigger plant, or flip early when the ceiling is low. A bloom of 60 days (indoor) fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.

Effects

😌Relaxed
72% of people reported feeling Relaxed
😴Sleepy
72% of people reported feeling Sleepy
😎Uplifted
58% of people reported feeling Uplifted
😊Happy
51% of people reported feeling Happy
🤩Creative
50% of people reported feeling Creative
🤗Euphoric
40% of people reported feeling Euphoric
🤤Hungry
34% of people reported feeling Hungry
😆Giggly
31% of people reported feeling Giggly
🧠Focused
21% of people reported feeling Focused

Best For

✦ Evening
✦ Muscle Spasms
✦ Pain
✦ Stress

Strain Type

Indica 60%Sativa 40%

Strain Data Sheet

🧬THC18% - 23% (Medium-High)
🌿LineageGrapefruit × NYC Diesel
🔬TypeFeminised Hybrid
🌡ClimateTemperate, adaptable
📅HarvestSept – Nov, S. hemisphere (typical)
📏HeightMedium
⚖️YieldMedium – High
🏠Yield IndoorUp to 450g/m²
🌳Yield OutdoorUp to 550 gr
⏱Flowering Time60 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 Diesel Feminised
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🛡️Aluminium interior lining
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🔢Scratchable serial number

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Grapefruit Diesel 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
BX2
Generations
3+
Breeding Programme
Backcross Stabilisation (BX2) — modern hybrid fixing
Stabilisation Notes — What This Means for Your Grow

Grapefruit Diesel carries clone-derived parents from the recent-era. We backcrossed twice to the dominant parent (BX2) to weld cut-specific traits into seed-stable form. Vigour and bud density run uniform across the population.

Breeding Goal

Fix parent-cut traits in Grapefruit Diesel without narrowing the population too far.

Selection Focus

Chosen for balanced indica/sativa expression, terpene fidelity and pack-to-pack uniformity.

Pollen / Mother Source

Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.

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