
Amherst Diesel Feminised
A sativa testing at 27% THC, Amherst Diesel Feminised is reported creative, energetic, calm. Grown right across the country, from the Cape to the Lowveld. Discreet nationwide delivery and a germination guarantee.
Royal King Genetics — Seed-Lot Testing
Figures below come from our own seed-lot testing rather than breeder marketing, taken from a single batch tested 2026-04-14 on 275 seeds.
About Amherst Diesel Feminised
Days 1 to 14, seed to fourth node: Expect Amherst Diesel to crack in roughly 48 hours on damp paper towel and to break soil by day three. Early growth runs upward quickly, narrow first leaves already reaching. Look for five nodes by day 14 with obvious gaps between them, which is the sativa pattern showing early. Damping off is rare if you hold near 70% humidity through this stage.
Weeks 3 to 6, building the frame: This is the point where it tries to get away from you. Start low-stress training in week three, bend the main stem over at 90 degrees in week four, and the secondaries will draw level for a flat canopy by week six without topping at all.
Bloom, weeks 1 to 10: The 12/88 character becomes obvious here. Pinene usually shows in week three and strengthens from there, with trichome cover visible without a loupe from about week five. Indoor yield: 400-600 g/m2. Height: Tall. Tested at 27% THC. Difficulty: easy.
Bloom Through to Jar
Weeks 4 to 6. This is where the plant stops looking like a frame and starts looking like a crop. Buds keep extending lengthwise rather than filling out, stacking fresh calyxes along the stems. Secondary branches often out-produce expectations here, since the open frame lets light down to sites a denser plant would simply have covered.
Weeks 8 to 10, ripening. Drop to plain water for the final ten days. The pinene carry gets strong enough that carbon filtration stops being optional in a residential street. Trichomes run clear to milky across the last fortnight, amber showing on sugar leaves before it reaches the calyxes; around 15% amber on the calyxes themselves is a common place to cut.
Drying and curing. Whole-plant hang in the dark at 17°C and 58% humidity for roughly 12 days — when stems snap instead of bending, it is ready for glass. Burp twice daily for the first fortnight, then once daily through weeks three and four. Finished weight should land near the 400-600 g/m2 estimate. The limonene note comes through markedly stronger after curing than it did at harvest, which is the clearest evidence that a cure builds flavour rather than merely preserving it.
Difficulty: easy. In flower for 9-10 weeks. Stands Tall. Indoors it returns 400-600 g/m2. Outdoors, 2000-3000 g/plant a plant. Feminised seeds.
Aroma, Flavour and Effect
The first thing Amherst Diesel does at 27% THC is arrive clean and resinous, like a pine plantation in the mist belt after rain. The creative, energetic, calm effects follow within minutes, as a sharpening rather than a lift: colour reads more saturated, music holds more detail, conversation wanders further than it would have. It runs two to three hours on a plateau instead of a peak, so nothing drops out from under you at the end. Limonene sits underneath all of it, adding a brightness that offsets any heaviness.
The Aromatic Three
Leading with Pinene, then Limonene, and Caryophyllene underneath. How this combination survives the move from flower to vapour or smoke is not a given. Held low, at 180-188°C, the limonene and caryophyllene notes stay legible with pinene underneath them. Run it hotter, or burn it, and the three collapse into one — still pleasant, but without the separation that makes this cultivar worth paying attention to.
Suitability and Recommendations
Who does well with Amherst Diesel? Indoor growers who want the harvest date to be their decision. Outdoor growers who want to choose the moment flowering starts. Anyone with the room and the patience to veg it properly before flipping. It is rated easy, which in practice means a moderate learning curve that rewards attention without needing laboratory conditions. Sent nationwide in plain, unbranded packaging, with sourced grow data on every strain page.
Effects
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At a Glance
In the Packet
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Amherst Diesel Feminised — Breeder Information
Royal King GeneticsRecreated and stabilised by Royal King Genetics , the breeding team behind this catalogue. Seed lots are germination-tested before they ship. More on the 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.