
Grimace Feminised
Order Grimace Feminised seeds online in Ireland. A quality indica cultivar at 19% THC delivering euphoric, creative, calm. Chosen for a short season and a damp finish. Fast shipping and a germination guarantee.
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 2026-09-11 on 450 seeds at 20-23°C.
About Grimace Feminised
Everything about Grimace at harvest follows from one decision, which is when you stop. The figures are 350 gr/m² indoors and 455 g/plant outdoors, with resin filling towards 19% THC. Weight arrives late on a plant this indica-leaning — the 79/21 split stacks calyxes hard through the middle weeks and then thickens them. Growers who cut on the calendar rather than the glass lose that last stage, and it is the most valuable one.
Where the weight is won
Three parts of the 56-63 days of bloom account for most of the difference between a good result and an average one on a plant rated 350 gr/m² indoors and 455 g/plant outdoors.
The stretch, days 1-10 after the flip. Canopy height set here decides how evenly light lands for the rest of the run. Twenty to thirty per cent is typical; taking the lowest fans around day seven pushes energy up to the sites that will finish.
Weeks three to five. Myrcene production climbs through this stretch and responds to a 6-8°C gap between lights-on and lights-off. Outdoors an Irish September provides that without help; indoors it has to be built, at roughly 25°C by day and 18-20°C at night. Bloom feed goes potassium-forward around EC 1.6-1.8.
The final fortnight. Feeding stops, plain pH-corrected water goes on, and the loupe comes out daily. Fifteen to twenty per cent amber suits the weight of effect this one is grown for. Outdoors, that falls between late September and mid-October, and the forecast gets a say.
Flowering: 56-63 days. Indoor yield: 350 gr/m². Outdoor yield: 455 g/plant. Plant height: 90-120 cm. Medium. Rated easy difficulty.
What Grimace is like in practice
The catalogue lists euphoric, creative, calm, and that matches what growers here report back. At 19% THC this indica sits where the dose is the whole question. One bowl through a vaporiser at 185°C leaves the head working and the body easy, which is what most people are after on a weeknight. More than that moves it firmly towards sedation. The Myrcene and Humulene together leave earth and faint sweetness, with fruit at the end.
Suited to evenings in, recovery after work, and the hour before sleep.
Terpene breakdown
Primary: Myrcene · Secondary: Humulene · Tertiary: Linalool. The three shift relative to each other across the cure. Straight off the dry the myrcene dominates; three or four weeks sealed in glass at 16-18°C and the linalool underneath comes up to meet it. Vaporising between 180°C and 195°C catches the widest span, because heat takes the lighter linalool molecules first.
Who it suits
Grimace suits growers with the fundamentals in place. Understand pH, rough nutrient ratios and a light cycle before committing to it; it asks for competence rather than expertise. Photoperiod genetics leave plant size and harvest date under your control — veg longer for a bigger plant, or flip early when the ceiling is low. A bloom of 56-63 days fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.
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Grimace 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.
A modern mid-2010s hybrid carrying at least one clone-only parent. BX2 is the right stabilisation point: two rounds of backcross fix the parent-cut traits without narrowing the population too far.
Fix parent-cut traits in Grimace without narrowing the population too far.
Chosen for purple/dark expression where it shows, dense bud structure and a true indica relaxation profile.
Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.