
Sweet Island Feminised
Sweet Island Feminised — sativa cannabis seeds suited to UK growing conditions. 15% THC with euphoric, creative, calm effects. Fast, discreet UK delivery.
Royal King Genetics — first-party test batch
Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-23 on 150 seeds.
About Sweet Island Feminised
Read Sweet Island backwards from the harvest: 600 g/m2 under lights, 600 g/plant outdoors, with resin filling out towards 15% THC. This 19/81 cultivar spreads its weight gain across the whole of bloom instead of front-loading it the way a quick indica does. Cutting early out of nerves about the weather is the most expensive mistake made with plants of this shape. In Britain that means holding through late September and into October depending on your latitude, because the terpinolene-led profile only fills out in the closing fortnight.
Getting the weight out of this plant
Three stretches of the 8-10 weeks of bloom decide whether you reach the top of this strain's range (600 g/m2 indoors, 600 g/plant outdoors). The rest is maintenance.
The first ten days of flower. What the plant does during the stretch sets canopy height, and canopy height sets how evenly the light lands. It can add half again its height. Supercrop anything that breaks the line of the canopy inside the first week or you will spend the rest of bloom lighting one branch properly and five badly.
Weeks three to five. Terpinolene production climbs through here, and it responds to a day-night temperature gap of 6-8°C. British autumn nights hand that to outdoor growers for free from September; indoors you have to build it, at roughly 25-26°C lights-on and 18-20°C lights-off. Bloom feed goes potassium-heavy around EC 1.6-1.8.
The last ten to fourteen days. Stop feeding and run pH-corrected water. Check trichomes daily under a 60x loupe — cut at 5-10% amber to keep the clear, lifted character intact. Outdoors that lands between late September and mid-October across most of Britain, and the weather forecast should get a vote.
Flowering: 8-10 weeks. Indoor yield: 600 g/m2. Outdoor yield: 600 g/plant. Plant height: 120 cm. Rated intermediate difficulty.
What Sweet Island is actually like
Growers report euphoric, creative, calm as the defining characteristics and our own notes agree. At 15% THC this sativa sits where most people find a workable window. Vaporised at 175-185°C the first effect is lift and mental energy, suited to work that benefits from it, a long walk, or an afternoon with company. The body stays light throughout, which makes it a genuine daytime option for anyone with a tolerance. The Terpinolene/Limonene pairing leaves a finish that keeps changing across a session.
Best suited to creative work, company, getting outdoors, and daytime use generally.
Terpene breakdown
Primary: Terpinolene · Secondary: Limonene · Tertiary: Ocimene. This combination turns up often in cultivars that win things, and it is usually the one growers comment on when a jar is opened for the first time after curing. Terpinolene anchors the aroma, limonene occupies the middle, and ocimene sits behind both — which is the part that separates this strain from others sharing its primary terpene.
Who it suits
Sweet Island suits growers with the basics in place. Understand pH, rough nutrient ratios and light cycles before you commit to it; it asks for competence rather than expertise. Photoperiod genetics leave plant size and harvest date under your control — veg longer for bigger plants, or flip early when space is short. The April to October season accommodates a bloom of 8-10 weeks comfortably for outdoor growers across the country.
Effects
Strain Type
Strain Data Sheet
Packaging
Feminised Premium
Seeds
authenticity
lining
number
Related Strains

Charlie Sheen Auto
Charlie Sheen Auto seeds. A hybrid cultivar at 19% THC delivering euphoric, happy, relaxed. Grow figures from named sources.

OG Chem Feminised
OG Chem Feminised — sativa cannabis seeds suited to UK growing conditions. 20% THC with euphoric, happy, uplifted effects. Fast, discreet UK delivery.

Marcosus Marshmellow Feminised
Grow Marcosus Marshmellow Feminised in the UK. Indica genetics at 14% THC, known for euphoric, creative, focused effects.

Godberry Feminised
Godberry Feminised — indica cannabis seeds suited to UK growing conditions. 19% THC with euphoric, calm effects. Fast, discreet UK delivery.
Sweet Island 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.
Four rounds of filial stabilisation on the Sweet Island cross. The high-energy terpene expression expression sits uniform; pheno-to-pheno yield variation runs within ±10% of the published numbers.
Carry Sweet Island from F1 cross to F4 production-ready seed stock.
Chosen for terpene saturation, sativa vigour and a workable finish time despite long-flowering genetics.
Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.