Alien OG
Cannabis seeds
by Royal Queen Seeds
Alien OG Cannabis Seeds by Royal Queen Seeds
Alien OG is a 50/50 indica/sativa hybrid cannabis seed strain from Royal Queen Seeds, crossing Alien Kush with Tahoe OG Kush to deliver up to 25% THC and a terpene profile loaded with citrus, earth, and pine. Available in packs of 1, 3, 5, or 10 feminised seeds, this is one of the strongest OG lines you can grow at home — indoors or out.
Which Pack Size?
Running a single plant to test the genetics? The 1-seed pack does the job. If you want to pheno-hunt or fill a 1m² canopy, go with 5 or 10 seeds — you'll get a better sense of what Alien OG can really do, and you'll have backups if germination doesn't go your way on one or two. The 3-pack sits right in the middle for growers who want a small run without committing to a full tent of one strain.
Alien OG Strain Genetics: Alien Kush Meets Tahoe OG Kush
Alien OG descends from two heavyweights of the American cannabis scene. The Alien Kush side brings dense flower structure and that unmistakable earthy-pine funk, while Tahoe OG Kush contributes raw potency and a citrus-forward terpene punch. The result is a perfectly balanced 50/50 hybrid — not leaning too far indica or sativa — that grows with the vigour you'd expect from well-established Kush genetics. Royal Queen Seeds' breeders stabilised this cross to keep the best traits from both parents: heavy resin production, manageable height, and a flowering time that won't test your patience.
If you've grown other OG crosses before — say, OG Kush or Bubba Kush seeds — Alien OG slots right into that family but tends to finish a touch faster and stays more compact indoors. That's the Alien Kush influence keeping things tidy.
Alien OG Appearance, Smell, and Taste
After drying and curing, Alien OG buds hold a bright green colour with a golden sheen, threaded with vibrant orange pistils and coated in a visible layer of trichomes. They're dense, sticky, and photograph well — the kind of flower that looks as potent as it is.
Break open a cured nug and you get hit with citrus first — sharp, almost lemon-peel bright — followed by a deep earthy base and a pine finish that lingers on your fingers. The taste follows the nose closely: citrus on the inhale, pine and earth on the exhale. According to research examining consumer perceptions of cannabis strain differences, terpene profiles like this citrus-pine-earth combination are among the most sought-after by experienced users (Reimann-Philipp et al., 2018). It's a classic OG flavour profile, dialled up a notch.
One honest note: the smell during late flowering is strong. If you're growing indoors without a carbon filter, your entire flat will know about it by week 7. Plan accordingly.
Growing Alien OG Seeds: Indoor and Outdoor Performance
Alien OG is a grower-friendly strain that performs well in tents, dedicated grow rooms, greenhouses, and outdoor gardens. Here's what to expect across environments.
| Specification | Detail |
|---|---|
| Seed Bank | Royal Queen Seeds |
| Genetics | Alien Kush x Tahoe OG Kush |
| Type | Feminised photoperiod |
| Indica / Sativa | 50% / 50% |
| THC Content | Up to 25% |
| Indoor Height | 80–120 cm |
| Outdoor Height | 140–180 cm |
| Indoor Flowering Time | 8–10 weeks |
| Outdoor Harvest | Early October |
| Indoor Yield | 450–500 g/m² |
| Outdoor Yield | 450–500 g/plant |
| Climate Suitability | Temperate climates, short summers |
| Available Pack Sizes | 1, 3, 5, 10 seeds |
Indoors, Alien OG stays between 80 and 120 cm — compact enough for a standard 80x80 or 100x100 tent. She responds well to low-stress training (LST) and SCRoG setups, which help distribute light evenly across the canopy and push yields towards that 500 g/m² ceiling. The 8–10 week flowering window is fairly standard for an OG hybrid; don't rush the final week or two, as that's when trichome production really ramps up.
Outdoors, plants stretch to 140–180 cm and thrive in temperate climates. The early October harvest window means she finishes before the worst of the autumn rain in most of Northern Europe — a genuine advantage over strains that drag into late October. Expect up to 450–500 g per plant from a well-fed outdoor specimen with decent sun exposure.
Alien OG THC Level and Potency
At up to 25% THC, Alien OG sits firmly in the high-potency bracket. For context, most commercial strains land between 15–20% THC, so this is a step above average. The balanced indica/sativa genetics mean the effect profile leans neither fully sedative nor fully cerebral — users commonly describe a relaxing, uplifting state that settles in gradually and lasts for hours.
According to a study examining cannabis strain naming conventions and their relationship to chemical profiles, OG-type strains consistently rank among the highest in THC concentration and terpene diversity (Pearce et al., 2018). Alien OG fits that pattern precisely.
A word of caution for newer growers who might also be newer consumers: 25% THC is no joke. If you're sharing your harvest with friends who don't have a high tolerance, suggest they start small.
Why Alien OG Over Other OG Strains?
We carry a good number of OG-family seeds from Royal Queen Seeds and other banks. So why pick Alien OG specifically? Three reasons stand out.
First, the yield-to-size ratio is excellent. At 80–120 cm indoors producing up to 500 g/m², you're getting serious output from a plant that doesn't demand a tall tent or aggressive height management. Compare that to some Tahoe OG cuts that stretch well past 150 cm indoors and need constant topping.
Second, the terpene profile is distinctive. Plenty of OGs lean heavily on earth and fuel — Alien OG brings a brighter citrus note that makes the dried flower genuinely pleasant to be around, not just potent. If you've ever opened a jar of OG Kush and thought "I wish this had more going on in the nose," Alien OG is your answer.
Third, the outdoor harvest timing. Early October is realistic for growers in the Netherlands, Belgium, northern France, and the UK. Many comparable strains promise outdoor harvests but actually need a Mediterranean climate to finish properly. Alien OG is more forgiving.
The one downside? She's not the fastest finisher indoors. If you're after a quick turnaround, an autoflower might serve you better. But for photoperiod growers who can wait 8–10 weeks, the quality of the final product justifies the patience.
How to Grow Alien OG Seeds
- Germinate your Alien OG seeds using the paper towel method or directly in a starter plug. Keep temperatures between 22–25°C and maintain moisture without waterlogging. Taproots typically emerge within 24–72 hours.
- Transplant seedlings into their final containers once the first set of true leaves appears. For indoor grows, 11–15 litre pots work well. Outdoor growers can go larger — 25 litres or more — to support the 140–180 cm frame.
- Maintain an 18/6 light cycle during vegetative growth. Alien OG responds well to topping after the 4th or 5th node, and LST helps create an even canopy. Veg for 3–5 weeks depending on your available space.
- Flip to 12/12 to trigger flowering. The first signs of pistils should appear within 7–10 days. From here, flowering takes 8–10 weeks. Monitor trichome colour with a loupe — harvest when most trichomes are milky with around 10–20% amber for a balanced effect.
- Dry harvested buds in a dark room at 18–21°C with 55–60% humidity for 7–14 days. Cure in airtight glass jars for at least 2–4 weeks, burping daily for the first week. This is where the citrus and pine terpenes really develop — don't skip it.
Growing Alien OG indoors? A complete grow tent kit saves you the hassle of sourcing lights, ventilation, and carbon filters separately — and the carbon filter is non-negotiable with a strain this pungent. If you're starting from scratch, a propagation kit helps nail the germination stage before transplanting into your main setup.
Frequently Asked Questions
Is Alien OG an indica or sativa?
Alien OG is a 50/50 indica/sativa hybrid, descending from Alien Kush and Tahoe OG Kush. The balanced genetics produce a plant that doesn't lean heavily in either direction — moderate height, solid structure, and a well-rounded effect profile.
How strong is Alien OG compared to other strains?
With up to 25% THC, Alien OG sits above the average commercial strain (15–20% THC). It's comparable to other top-shelf OG crosses like Tahoe OG and SFV OG. Experienced growers and consumers will appreciate the potency; newcomers should approach with respect.
What does Alien OG taste like?
Expect a bright citrus hit up front — think lemon peel — followed by deep earthy tones and a piney finish. The terpene profile is classic OG but with more citrus brightness than most. Proper curing for at least 2–4 weeks brings out the full flavour.
How long does Alien OG take to flower indoors?
Alien OG flowers in 8–10 weeks under a 12/12 light cycle. Most phenotypes finish closer to 9 weeks. Check trichome maturity with a jeweller's loupe rather than relying solely on the calendar — milky trichomes with some amber is the sweet spot.
Can I grow Alien OG outdoors in Northern Europe?
Yes. Alien OG is suited to temperate climates and areas with shorter summers. Outdoor plants are ready for harvest in early October, which is realistic for the Netherlands, Belgium, and the UK. She reaches 140–180 cm outdoors and can yield up to 450–500 g per plant.
What yield can I expect from Alien OG indoors?
Under optimised conditions — good lighting, proper nutrition, and training techniques like LST or SCRoG — Alien OG produces 450–500 g/m² indoors. Plants stay between 80–120 cm, making them manageable in standard grow tents.
How many Alien OG seeds should I buy?
For a first run or single-plant grow, 1 or 3 seeds is enough. If you want to fill a 1m² canopy or select the best phenotype, go with 5 or 10. Having spare seeds also covers you if germination doesn't go perfectly on every seed.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.