
Mt. Rainier Feminised
Buy Mt. Rainier Feminised seeds in South Africa. Hybrid · 20% THC · relaxed, happy, euphoric. Every figure on this page is sourced, and every order ships unbranded.
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 2026-04-11 on 275 seeds.
About Mt. Rainier Feminised
The way to plan Mt. Rainier is backwards from the day you intend to cut, with Up to 400g/m² per square metre indoors and Up to 500 gr per plant outdoors as the figures you are working toward, at 20% THC. Count 8-9 weeks back from that date and you have your flip date. Weight comes on evenly across 8-9 weeks, with a late surge that punishes impatience. The 43/57 balance gives you stacking density and broad trichome cover together. Outdoors, late March to late April is the sweet spot — after the summer humidity has broken, before the first Highveld frost.
Where the Weight Actually Comes From
Yield on Mt. Rainier — the Up to 400g/m² indoors and Up to 500 gr outdoors quoted above — is decided in three short stretches of the 8-9 weeks bloom rather than evenly across it.
The first ten days after the flip. Whatever stretch happens here sets your canopy, and an uneven canopy wastes light for the remainder of the grow. Stretch of 30-40% is normal. One round of low-stress training on the tallest shoots levels it out.
Weeks three to five. This is when caryophyllene production climbs, and it answers to the gap between day and night temperature rather than to either number on its own. Keep at least 6-8°C between them. Outdoor growers in the interior provinces get that swing free in March and April; indoors, aim for 25-26°C lights-on against 18-20°C lights-off, with potassium-led bloom feed at EC 1.6-1.8.
The last ten to fourteen days. Stop feeding, flush with pH-corrected water, and read trichomes daily under a 60x loupe. Cut at 10-15% amber to keep both sides of the hybrid in play. Outdoors that usually lands between late March and mid-April.
Difficulty: intermediate. In flower for 8-9 weeks. Stands Short. Indoors it returns Up to 400g/m². Outdoors, Up to 500 gr a plant.
What Mt. Rainier Is Like to Use
The effects most commonly reported for this cultivar are relaxed, happy, euphoric. At 20% THC it sits in a bracket where flexibility is the point. Lower doses read clear and functional in the morning, higher doses read relaxed in the evening. Because the 43/57 split is even, direction is set by how much you take rather than fixed by the genetics. The Caryophyllene/Myrcene pairing leaves a warm spice that dries slightly on the exhale on the palate.
Where it fits: most occasions, with the dose adjusted to whatever the situation asks for.
The Aromatic Three
Leading with Caryophyllene, then Myrcene, and Humulene underneath. How this combination survives the move from flower to vapour or smoke is not a given. Held low, at 180-188°C, the myrcene and humulene notes stay legible with caryophyllene 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
Mt. Rainier is a reasonable fit for growers with the basics already in place. Understand pH, know roughly what nutrient ratios do, and be able to hold a light cycle — it will not carry you, but it does not punish the occasional slip either. Photoperiod genetics leave size and timing in your hands — hold it in veg for a bigger plant, or flip early when headroom is the constraint. A September-to-May outdoor season comfortably covers a 8-9 weeks bloom in the frost-free provinces. Posted discreetly anywhere in South Africa, with sourced grow figures shown on every strain page.
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Mt. Rainier 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 Mt. Rainier. Each generation we cull aggressively against off-types — the F4 population reflects only the phenos that match the cultivar reference profile.
Cull off-type phenos in Mt. Rainier through filial selection.
Chosen for trichome density, bud structure and the hybrid trait balance the cross was engineered for.
Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.