
Blue Diamond Feminised
Grow Blue Diamond Feminised in Ireland. Sativa genetics testing at 22% THC. Known for euphoric, creative, 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 2026-09-06 on 375 seeds at 21-24°C.
About Blue Diamond Feminised
Does Blue Diamond finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. At 14/86 it will want height, and height outdoors here means wind. Stake it earlier than you think you need to. Bloom takes 50-60 days, 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 400 g/m2 indoors and up to 400 g/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 22% 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 Blue Diamond
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 sativa; the deciding factor is your week, not the plant.
How does it handle the weather here? The open structure sheds heat and, more usefully, dries out quickly after rain. Wind is the real problem for a plant this shape — stake it properly before it needs it.
When does bloom feed start? Within a week of the first pistils. The 14/86 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 50-60 days of bloom completely; outdoors the plant gets light no lamp matches and can reach up to 400 g/plant, and pays for it in rain. Flowering: 50-60 days. Indoor yield: up to 400 g/m2. Outdoor yield: up to 400 g/plant. Plant height: Medium. Rated intermediate difficulty.
Flavour, aroma and effect
Blue Diamond arrives in order. The first draw at 22% THC gives resin and green wood, clean rather than sweet. The euphoric, creative, 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. The three shift relative to each other across the cure. Straight off the dry the pinene dominates; three or four weeks sealed in glass at 16-18°C and the caryophyllene underneath comes up to meet it. Vaporising between 180°C and 195°C catches the widest span, because heat takes the lighter caryophyllene molecules first.
Who it suits
Who does well with Blue Diamond? 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 intermediate, which means a moderate learning curve that rewards attention without needing specialist kit.
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Feminised Premium
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Blue Diamond 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.
F3 stabilisation on the Blue Diamond cross. Three rounds of selection have brought the population to roughly 80% trait homogeneity — a small fraction of pheno variance is still present and is being culled in the next cycle.
Stabilise Blue Diamond across three rounds toward F4 production-ready stock.
Chosen for terpene saturation, sativa vigour and a workable finish time despite long-flowering genetics.
Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.