
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.
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.
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.
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Amherst Diesel 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.
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.
Carry Amherst Diesel from F1 cross to F4 production-ready seed stock.
Chosen for clear-headed terpene expression, structural manageability and a finish that lands inside the published window.
Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.