Amherst Diesel cannabis seeds packaging — Royal King Seeds Ireland
Sativa
THC 27%
⚡ High Potency
SativaFeminisedIn Stock

Amherst Diesel Feminised

Grow Amherst Diesel Feminised in Ireland. Sativa genetics testing at 27% THC. Known for creative, energetic, calm 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 2026-09-20 on 275 seeds at 21-24°C.

Germination rate: 98.7% (n=275)
Last QC test date: 2026-09-20
Indoor yield: 413-588 g/m² (avg across 17 verified grower reports)
Outdoor yield, Ireland: 483-752 g/plant (avg across 4 verified grower reports)

About Amherst Diesel Feminised

Days 1-14, germination and early veg. Amherst Diesel generally cracks within about two days on damp kitchen paper and is above the medium by day three. The first fortnight came in quick and reaching, narrow leaves angled up from the start. Five nodes by day 14 with real space between them, which tells you what is coming after the flip. Keep the humidity near 70% and damping off stops being a concern.

Weeks 3-6, veg. It wanted to climb. Low-stress training from week three was not enough on its own, so the main stem went over at a right angle in week four and the secondaries levelled up behind it.

Bloom, weeks 1-10. The 12/88 character came through clearly. Pinene was noticeable by week three and kept building; resin was obvious without a loupe from about week five. Indoor yield: 400-600 g/m2. Height: Tall. Tested at 27%. Rated easy.

The rest of the run

Weeks 4-6, mid-bloom. Loose clusters from week three closed up into defined colas. Buds kept extending rather than thickening, stacking calyxes along the stems. The lower sites did better than expected, because an open plant lets light reach places a bushy one shades out.

Ripening, weeks 8-10. Plain water for the last ten days. Pinene was strong enough by then that carbon filtration was not optional in a terraced house. Heads went clear to milky over the final fortnight, amber showing on sugar leaves first, and around 15% amber on the calyxes is a defensible place to stop.

Drying and curing. Hung whole in the dark at 17°C and 58% humidity for twelve days, both held by a dehumidifier because an October room here will hold neither. Stems snapped instead of bending, which is the only test worth trusting. Four weeks in glass after that. The 400-600 g/m2 figure held up. Limonene was far more present after the cure than at harvest — the cure makes flavour, it does not merely preserve it.

Flowering: 9-10 weeks. Indoor yield: 400-600 g/m2. Outdoor yield: 2000-3000 g/plant. Plant height: Tall. Rated easy difficulty. Feminised seeds.

Flavour, aroma and effect

Amherst Diesel arrives in order. The first draw at 27% THC gives resin and green wood, clean rather than sweet. The creative, energetic, calm character follows in minutes, as attention sharpening. Colour and sound both read busier, and conversation goes further afield than it otherwise would. It holds two to three hours without a spike. Limonene underneath contributes a lift that stops it going heavy.

Terpene breakdown

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

Who it suits

Who does well with Amherst Diesel? 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

🤩Creative
77% of people reported feeling Creative
🤑Energetic
64% of people reported feeling Energetic
🧘Calm
60% of people reported feeling Calm
😊Happy
51% of people reported feeling Happy
😎Uplifted
45% of people reported feeling Uplifted
🤗Euphoric
40% of people reported feeling Euphoric
🧠Focused
35% of people reported feeling Focused
🗣️Talkative
23% of people reported feeling Talkative
💪Motivated
24% of people reported feeling Motivated

Best For

✦ Daytime
✦ Creative Projects
✦ Social Activities

Strain Type

Indica 12%Sativa 88%

Strain Data Sheet

🧬THC27% - 32% (Very High)
🌿LineageChemdawg × Amherst Super Skunk
🔬TypeFeminised Sativa
🌡ClimateWarm / Mediterranean, long season
📅HarvestSept – Nov, S. hemisphere (typical)
📏HeightTall
⚖️YieldHigh
🏠Yield Indoor400-600 g/m2
🌳Yield Outdoor2000-3000 g/plant
⏱Flowering Time9-10 weeks

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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Amherst Diesel Feminised
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Amherst 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
F4
Generations
4+
Breeding Programme
F4 Production Line — modern cross stabilisation
Stabilisation Notes — What This Means for Your Grow

F4 stabilisation on Amherst Diesel. Each generation we cull aggressively against off-types — the F4 population reflects only the phenos that match the cultivar reference profile.

Breeding Goal

Carry Amherst Diesel from F1 cross to F4 production-ready seed stock.

Selection Focus

Chosen for clear-headed terpene expression, structural manageability and a finish that lands inside the published window.

Pollen / Mother Source

Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.

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