Dark Phoenix
Cannabis seeds
by Greenhouse Seeds
Dark Phoenix Cannabis Seeds by Green House Seeds
Dark Phoenix is a 60/40 sativa-dominant hybrid from Green House Seeds' US collection that crosses Trainwreck with Jack Herer to produce tall, vigorous plants with stunning dark purple-to-black hues and outdoor yields averaging 700g per plant. If you want a sativa-leaning strain that flowers in 8–10 weeks rather than the usual 12+, this is where you start.
Choose Your Pack Size
| Pack | Seeds | SKU |
|---|---|---|
| Small | 3 seeds | CSGH0251 |
| Standard | 5 seeds | CSGH0252 |
| Grower's Pack | 10 seeds | CSGH0253 |
Running a single tent? The 3-pack gives you enough to select a keeper phenotype. If you're filling a room or growing outdoors with space to spare, the 10-pack gives you better odds of finding that one plant with the deepest purple colouring and the heaviest colas.
Genetics and Lineage: Trainwreck Meets Jack Herer
Dark Phoenix seeds carry genetics from two legendary strains. On one side, Trainwreck — a Californian sativa-hybrid famous for its spicy citrus aroma and immediate cerebral hit. On the other, Jack Herer — the Amsterdam-bred classic named after the cannabis activist, known for its earthy, piney, hazy terpene profile and clear-headed effects. Green House Seeds combined these two into a single hybrid that leans sativa (60/40) but doesn't punish you with a 14-week flowering time.
The result is a strain that inherits the best structural traits of both parents: Trainwreck's vigour and stretch, Jack Herer's resin production and aromatic complexity. We'd pick Dark Phoenix over a pure Jack Herer cut if you're growing indoors and need something that actually finishes before your patience runs out.
Growing Dark Phoenix Seeds: What to Expect
Dark Phoenix grows tall — averaging 170–200cm outdoors — and stretches aggressively during the first weeks of flowering. In a tent, that means you need to plan your training early or you'll be fighting for headroom by week three of bloom.
Indoor Growing
- Top your plants during veg at the 4th or 5th node to break apical dominance and encourage lateral branching.
- Apply LST (low-stress training) by bending and tying branches outward to create an even canopy. Dark Phoenix responds well to this — the side branches are flexible enough in veg to handle aggressive bending.
- Defoliate fan leaves that block light penetration to lower bud sites. Do this once in late veg and again around day 21 of flower.
- Lollipop the bottom third of each plant before flipping to 12/12. Dark Phoenix puts energy into top colas when you remove the wispy lower growth.
- Expect continued stretching for 2–3 weeks after the flip. Leave at least 40–50cm between your canopy and your light at flip time.
- Harvest after 8–10 weeks of flowering. Watch the trichomes — milky with 10–20% amber is the sweet spot for that focused, uplifting effect.
Outdoor Growing
Outdoors, Dark Phoenix has room to express its full height. Plants can reach 200cm and produce around 700g per plant when given full sun, good soil, and a long enough season. In northern Europe, you're looking at a late October harvest — push it if the weather holds, but don't let autumn rain sit on those dense colas.
Dark Phoenix Flower Characteristics
Here's where this strain gets genuinely special. As Dark Phoenix matures through flower, the buds can develop deep blue, purple, and almost black hues. Not every phenotype shows the colour equally — cooler night temperatures (around 15–18°C in late flower) bring it out more dramatically. Even without the cold snap, you'll see some purple creeping into the calyxes by week 6–7.
The buds themselves are dense but not rock-hard. They've got that classic sativa structure — slightly elongated, with visible pistils and a thick coating of trichomes that makes them sticky to handle during trim. Dried and cured properly, the flowers smell like a walk through an Amsterdam coffeeshop circa 2005: earthy pine, a haze backbone, and then this unexpected spicy citrus that hits when you break a nug open. That's the Trainwreck side talking.
Dark Phoenix Seeds Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Green House Seeds |
| Genetics | Trainwreck x Jack Herer |
| Type | 60/40 Sativa-Dominant Hybrid |
| Flowering Time | 8–10 weeks |
| Height (Outdoor) | 170–200cm |
| Yield (Outdoor) | ~700g/plant |
| Yield (Indoor) | Variable — depends on training and setup |
| Colour Expression | Dark blue, purple, near-black hues in late flower |
| Aroma | Earthy, piney, hazy (Jack Herer) + spicy citrus (Trainwreck) |
| Effect | Uplifting, focused, subtle physical relaxation |
| Recommended Training | LST, topping, defoliation, lollipopping |
| Available Packs | 3, 5, or 10 seeds |
Complete your Dark Phoenix grow with a proper training setup. Soft plant ties and adjustable clip fans help manage that aggressive stretch without snapping branches. If you're growing in a tent, a carbon filter is non-optional once those terpenes start pumping out around week 5 of flower — your neighbours will smell it before you do.
Why Dark Phoenix Seeds Deserve Space in Your Grow Room
The problem with most sativa-dominant strains is time. You flip to flower, wait 10 weeks, then wait another 2–3 because the breeder's "10 weeks" was optimistic. Meanwhile your indica in the next tent finished a month ago. Dark Phoenix genuinely finishes in 8–10 weeks — closer to 8 if you're running a well-dialled environment with consistent light and temperature.
The other problem with sativas indoors is height. Unmanaged, Dark Phoenix will hit your light fixture and burn its own tops. But here's the thing — this strain actually responds brilliantly to training. Top it once, maybe twice, apply LST, and you get a bushy, multi-topped plant that fills a 60x60cm footprint without trying to escape through the ceiling. The stretch is predictable: roughly doubling in height during the first 2–3 weeks of flower. Account for that, and you're fine.
The honest limitation? Indoor yields are highly variable. Green House Seeds doesn't give a specific g/m² number for Dark Phoenix, and we respect that — it depends entirely on your light intensity, pot size, training method, and veg time. Outdoors, the 700g/plant figure is achievable with full sun and decent soil. Indoors, expect less unless you're running a proper setup with high-output lighting and extended veg.
Aroma and Effect: What Dark Phoenix Delivers
Once dried and cured for at least 2 weeks (3–4 is better), Dark Phoenix buds release a complex bouquet. The first thing you notice is earthy pine — that's the Jack Herer backbone. Break the bud open and you get a hazy, almost incense-like quality underneath. Then the Trainwreck genetics show up as a spicy citrus note that lingers on your fingers.
The effect leans cerebral. Subtle physical relaxation without couch-lock, an uplifted mood, and clear-headed focus that lets you actually get things done. This is a morning or daytime strain — the kind you smoke before tackling a creative project, going for a walk, or cleaning the flat without feeling like you're wading through treacle. Compared to a heavy indica like, say, a Bubba Kush, Dark Phoenix keeps you functional. Compared to a pure haze, it's less racy and more grounded.
Frequently Asked Questions
How tall does Dark Phoenix grow indoors?
Without training, Dark Phoenix can easily exceed 170cm indoors. With topping and LST applied during veg, you can keep plants at 80–120cm — manageable in most tents. The key is starting training early and accounting for the 2–3 week stretch after flipping to 12/12.
What is the flowering time for Dark Phoenix seeds?
Dark Phoenix flowers in 8–10 weeks. Most phenotypes finish closer to 9 weeks. Check trichome colour with a loupe — milky with some amber means it's ready.
Is Dark Phoenix suitable for beginner growers?
It's manageable if you're comfortable with basic training techniques like topping and LST. The vigorous stretch can catch new growers off guard, so plan your vertical space carefully. If you've grown one or two plants before, you'll handle Dark Phoenix fine.
What yields can I expect from Dark Phoenix indoors?
Green House Seeds doesn't specify indoor yields because they vary heavily with setup. With a quality LED, 3–4 weeks of veg, and proper training, expect solid harvests — but don't compare directly to the 700g/plant outdoor figure. That requires full sun and months of veg time.
Does Dark Phoenix always turn purple?
Not always. The dark blue-to-purple-to-black colouring is genetic potential, not a guarantee. Cooler night temperatures (15–18°C) during late flower bring out the colours more dramatically. Some phenotypes show it regardless of temperature; others stay green.
What does Dark Phoenix smell like during flowering?
Expect strong earthy pine and haze aromas from mid-flower onward, with spicy citrus notes intensifying as harvest approaches. A carbon filter is strongly recommended for indoor grows — the smell is noticeable from week 5 of flower.
Can I grow Dark Phoenix outdoors in northern Europe?
Yes, but timing matters. Dark Phoenix needs 8–10 weeks of flower after the summer solstice triggers bloom. In the Netherlands or UK, that means harvesting in mid-to-late October. Watch for rain and humidity in the final weeks — dense colas and autumn moisture aren't friends.
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.