AlienZ
Cannabis seeds
by Greenhouse Seeds
AlienZ Cannabis Seeds by Greenhouse Seeds
AlienZ is a high-yielding feminised cannabis seed from Greenhouse Seeds that crosses Watermelon Zkittlez with Velvet Moon to produce resin-drenched, terpene-rich flowers with 24% THC. This 60/40 indica-sativa hybrid grows vigorously in any environment and delivers up to 1400g per plant outdoors — the kind of numbers that make you double-check you read it right.
Which Pack Size of AlienZ Seeds?
AlienZ seeds come in packs of 3, 5, or 10. If you're running a single tent and want to pheno-hunt a bit, the 5-pack is the sweet spot — enough plants to find your favourite keeper without overcommitting on space. The 3-pack works if you've already got a full room and just want to slot a couple in. Go for 10 if you're growing outdoors or filling a larger setup, because at those yields, even a few plants will keep your jars stocked for months.
Specifications for AlienZ Cannabis Seeds
| Spec | Value |
|---|---|
| Seed Bank | Greenhouse Seeds |
| Genetics | Watermelon Zkittlez x Velvet Moon |
| Type | Feminised |
| Indica / Sativa | 60% Indica / 40% Sativa |
| THC | 24% |
| Height (Indoor) | 120–180 cm |
| Height (Outdoor) | 150–250 cm |
| Yield (Outdoor) | Up to 1400 g/plant |
| Structure | Christmas tree — strong main cola with secondary branches |
| Resin Production | Very high |
| Available Pack Sizes | 3, 5, or 10 seeds |
Growing AlienZ indoors? A proper carbon filter is non-negotiable with terpenes this loud — those candy-lemon notes will fill your entire flat. Pair your seeds with a complete grow tent kit that includes ventilation, and grab a loupe or pocket microscope to time your harvest by trichome colour. For processing all that resin, a set of bubble bags or a pollen press will put the extraction potential of these flowers to good use.
Why AlienZ Seeds Deserve a Spot in Your Grow
We've carried Greenhouse Seeds since the early days — they're an Amsterdam institution, and their breeding programme consistently turns out varieties that actually deliver on the numbers printed on the packet. AlienZ is a good example. The cross of Watermelon Zkittlez and Velvet Moon isn't just marketing fluff; it produces a terpene profile you can smell from across the room. Think sour lemon peel layered over sticky-sweet watermelon candy, with an earthy undertone that rounds it all out. It's the kind of jar you open and everyone in the room turns around.
From a grower's perspective, the real selling point is the combination of vigour and yield. AlienZ develops a classic Christmas tree structure with a dominant main cola and well-spaced lateral branches — which means decent light penetration without aggressive training. Indoors, expect plants between 120 and 180 cm, so you'll want at least a metre of headroom above your pots. Outdoors, they can stretch to 250 cm and produce up to 1400g per plant. Even indoor yields are described by Greenhouse Seeds as "very rewarding," which in our experience with their genetics usually means you'll need extra drying space.
The one thing to watch: AlienZ gets tall. If you're working with a 120 cm tent, you'll need to top early or run a SCRoG net to keep the canopy manageable. The 40% sativa genetics show in the stretch during early flower. Plan for it, and you'll be fine. Skip the training, and your main cola will be kissing the light. The heavy resin production also means humidity control in late flower is critical — those dense, sticky buds hold moisture, and you don't want to lose a harvest to bud rot after putting in weeks of work.
How to Grow AlienZ Cannabis Seeds
- Germinate your AlienZ seeds using the paper towel method or directly in a starter plug. Keep the temperature around 22–25°C and the medium moist but not waterlogged. Taproots typically appear within 24–72 hours.
- Transplant seedlings into their final containers once they have 2–3 sets of true leaves. AlienZ responds well to 11–15 litre pots indoors. Outdoors, go bigger — 30 litres or direct in-ground for maximum yield potential.
- During vegetative growth, consider topping or using low-stress training (LST) to manage height, especially indoors. The natural Christmas tree structure is productive, but the 120–180 cm indoor height means vertical space fills up fast. A SCRoG net at canopy level helps distribute light evenly across those secondary branches.
- Flip to 12/12 light cycle when plants reach roughly half your target final height — the sativa influence means a noticeable stretch in the first 2–3 weeks of flower. Outdoor growers can let nature handle the light schedule; flowering will initiate as days shorten.
- In late flower, monitor humidity closely. Target 40–50% RH once buds begin to swell. AlienZ produces extremely resinous, dense flowers that trap moisture — good airflow and a dehumidifier are your best friends here.
- Harvest when trichomes shift from clear to milky with around 10–20% amber, depending on your preference. The heavy resin coating makes these flowers excellent candidates for dry sift, bubble hash, or rosin pressing after you've set aside your smoking stash.
Terpene Profile and Aroma of AlienZ
This is where AlienZ really earns its keep. The Watermelon Zkittlez parent brings waves of candy sweetness — genuinely fruity, not that vague "sweet" descriptor that could mean anything. Velvet Moon contributes sour lemon zest and a deeper, earthy base note that stops the profile from being one-dimensional. The combination is moreish in the literal sense: you open the jar, take a sniff, and immediately want to smell it again.
At 24% THC with that indica-leaning genetic split, the effects are pronounced and long-lasting. Greenhouse Seeds describes hours of giggles and a social, shareable quality — the kind of flower you bring to a gathering, not the kind that glues you to the sofa in silence. Though with 60% indica genetics, don't be surprised if the back end of the session gets heavier and more relaxed. That's the Velvet Moon showing up late to the party.
Frequently Asked Questions
How tall does AlienZ grow indoors?
Indoors, AlienZ reaches 120–180 cm. That's tall enough to cause problems in shorter tents, so top your plants early or run a SCRoG net to keep the canopy under control. The sativa-side stretch in early flower adds significant height.
What is the yield of AlienZ outdoors?
Greenhouse Seeds rates AlienZ at up to 1400g per plant outdoors. That's an exceptional number, even for their catalogue. You'll need a long, warm growing season and plenty of root space to hit the upper end of that range.
Is AlienZ more indica or sativa?
AlienZ is 60% indica and 40% sativa. In practice, that means a solid physical structure with good lateral branching, but with enough sativa influence to produce a noticeable stretch during the first weeks of flowering.
What does AlienZ smell and taste like?
Expect sour lemon and earthy notes from the Velvet Moon side, layered with candy-sweet watermelon from the Zkittlez genetics. The aroma is loud — carbon filtration is strongly recommended for indoor grows unless you want your neighbours involved.
Are AlienZ seeds good for making hash or extracts?
Absolutely. AlienZ produces extremely resinous flowers with a thick trichome coating. That makes them well suited for dry sift, bubble hash, or rosin pressing. The terpene-rich resin also means your extracts will carry over that candy-lemon flavour profile.
What is the THC content of AlienZ?
AlienZ tests at 24% THC according to Greenhouse Seeds. That puts it in the high-potency bracket. The effects are long-lasting and social, with a heavier, more relaxing tail end typical of its indica-dominant genetics.
Can I grow AlienZ in a small tent?
You can, but you'll need to manage height aggressively. In a 120 cm tent, top early and use LST or a SCRoG net. Without training, the main cola will outgrow your headroom. A 150 cm or taller tent gives you much more breathing room with this strain.
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.