
Yumboldt Feminised
Yumboldt Feminised — premium indica cannabis seeds suited to Irish growing conditions. 15% THC with relaxed, sleepy, happy effects. Discreet delivery across Ireland, with sourced grow figures on every strain page.
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 2026-09-15 on 375 seeds at 20-23°C.
About Yumboldt Feminised
Does Yumboldt finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. A compact 71/29 plant is easier to shelter and easier to hide, though the density that makes it worth growing is also what holds water after rain. Bloom takes 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? 350 g/m2 indoors and 400 - 600 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 15% THC the effort is well spent either way.
Is it a sensible first grow? Yes. It survives the things that go wrong in a first attempt — forgotten waterings, a feed mixed by eye, a shed that is cold by morning — and still produces something worth curing.
Other questions that come up about Yumboldt
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 indica; the deciding factor is your week, not the plant.
How does it handle the weather here? The dense canopy shades itself, which is useful on the handful of genuinely warm days and a liability in a wet week. Mulch the root zone, water early, and keep air moving underneath.
When does bloom feed start? Within a week of the first pistils. The 71/29 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 60 days of bloom completely; outdoors the plant gets light no lamp matches and can reach 400 - 600 g/plant, and pays for it in rain. Flowering: 60 days. Indoor yield: 350 g/m2. Outdoor yield: 400 - 600 g/plant. Plant height: 1 m. Rated beginner difficulty.
What Yumboldt is like in practice
The catalogue lists relaxed, sleepy, happy, and that matches what growers here report back. At 15% 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
Yumboldt suits growers at any stage, a first outdoor season included. It tolerates the ordinary early mistakes — watering by habit rather than by weight, a feed that drifts, a tunnel that runs cold overnight — without the crop coming apart. 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 60 days fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.
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Yumboldt 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.
Two backcross generations to the recurrent parent have welded Yumboldt into a stable seed line. The cross-derived bud-to-leaf ratio expresses uniformly — no surprise-pheno hunting once the pack pops.
Carry a clone-derived recent-era hybrid through to a stable seed pack.
Chosen for resin output, a low-slung stature and a clean indica terpene fingerprint.
Royal King Genetics in-house mother stock — pollen taken from a sibling male drawn from the same selected pheno population.