501st OG cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 18%
🌙 Sleep Aid
IndicaFeminisedIn Stock

501st OG Feminised

501st OG Feminised — premium indica cannabis seeds suited to Irish growing conditions. 18% THC with relaxed, sleepy, happy effects. Discreet delivery across Ireland, with sourced grow figures on every strain page.

Select Pack Size
€10.95EUR
1
🇮🇪Free Irish Delivery
🌱Germination Promise
🔒Unmarked Packaging
⚗

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 2026-09-17 on 475 seeds at 20-23°C.

Germination rate: 98.0% (n=475)
Last QC test date: 2026-09-17
Indoor yield: 434-552 g/m² (avg across 6 verified grower reports)
Outdoor yield, Ireland: 460-622 g/plant (avg across 5 verified grower reports)

About 501st OG Feminised

Does 501st OG finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. A compact 74/26 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 7-9 weeks, so the harvest date is set by the calendar far more than by your technique.

What should I expect to take off it? 885 g/m² indoors and Up to 400 gr 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 18% 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 501st OG

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 74/26 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 7-9 weeks of bloom completely; outdoors the plant gets light no lamp matches and can reach Up to 400 gr, and pays for it in rain. Flowering: 7-9 weeks. Indoor yield: 885 g/m². Outdoor yield: Up to 400 gr. Plant height: Short. Rated easy difficulty.

What 501st OG is like in practice

The catalogue lists relaxed, sleepy, happy, and that matches what growers here report back. At 18% 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 Linalool and Myrcene together leave a finish that keeps shifting across a session.

Suited to evenings in, recovery after work, and the hour before sleep.

Terpene breakdown

Primary: Linalool · Secondary: Myrcene · Tertiary: Caryophyllene. The three shift relative to each other across the cure. Straight off the dry the linalool 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

501st OG 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 7-9 weeks fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.

Effects

😌Relaxed
72% of people reported feeling Relaxed
😴Sleepy
72% of people reported feeling Sleepy
😊Happy
58% of people reported feeling Happy
🤤Hungry
54% of people reported feeling Hungry
🤗Euphoric
47% of people reported feeling Euphoric
🧘Calm
40% of people reported feeling Calm
🌿Stress Relief
27% of people reported feeling Stress Relief
💆Body High
24% of people reported feeling Body High
😶‍🌫️Sedated
21% of people reported feeling Sedated

Best For

✦ Evening
✦ Relaxation
✦ Sleep Support

Strain Type

Indica 74%Sativa 26%

Strain Data Sheet

🧬THC18% - 22% (Medium-High)
🌿LineageSkywalker OG × Rare Dankness #1
🔬TypeFeminised Indica
🌡ClimateCool–temperate / continental
📅HarvestSept – Nov, S. hemisphere (typical)
📏HeightShort
⚖️YieldHigh
🏠Yield Indoor885 g/m²
🌳Yield OutdoorUp to 400 gr
⏱Flowering Time7-9 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers are responsible for complying with the law where they live.
1
501st OG Feminised
royalkingseeds.ie
IG
FB
X
🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

Related Strains

Star Killer cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 15%
🌙 Sleep Aid

Star Killer Feminised

RelaxedSleepyHappy
▼
€10.04EUR
Night Terror OG cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 21%
🌙 Sleep Aid

Night Terror OG Feminised

CreativeRelaxedSleepy
▼
€14.15EUR
Rare Darkness cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 23%
🌙 Sleep Aid

Rare Darkness Feminised

EuphoricRelaxedSleepy
▼
€12.32EUR
Papa's OG cannabis seeds packaging — Royal King Seeds Ireland
Indica
THC 25%
⚡ High Potency

Papa's OG Feminised

HappyRelaxedSleepy
▼
€10.49EUR

501st OG Feminised — Breeder Information

Royal King Genetics

Bred 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.

Stabilisation Level
BX3
Generations
4+
Breeding Programme
Backcross Stabilisation (BX3) — clone-to-seed restoration
Stabilisation Notes — What This Means for Your Grow

501st OG has been the target of countless seed-bank backcross programmes. Ours is BX3 — three rounds of crossing the elite cut back to the parental line until trait expression evened out. The pack grows true to the mother cut.

Breeding Goal

Recreate the 501st OG clone-only cut in stable seed form.

Selection Focus

Chosen for trichome coverage, stout structure and consistent flowering time across the pack.

Pollen / Mother Source

Royal King Genetics elite-cut archive — pollen from a maintained S1 line of the original elite mother.

Last Batch QC Verified
16 September 2026· 99%+ germination