Dark Devil Autoflowering by Seeds66 is one of those strains that stays imprinted in your memory after the very first run. Deep purple to almost black buds, a compact, resinous structure and a balanced, easy-to-handle effect make it a real eye-catcher in any tent. With THC levels around 15–20% and a clearly indica-leaning backbone, it delivers relaxing sessions without turning everything off completely – carried by a profile of citrus, spice and subtle woody notes.
Quick facts: Dark Devil Autoflowering
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Genetics: Afghani Big Devil XL x Hindu Kush Auto
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Type: indica-dominant autoflowering hybrid
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Life cycle: approx. 10 – 11 weeks from seed to harvest
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Indoor yield: 500 – 600 g/m²
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Outdoor yield: 120 – 200 g per plant
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THC / CBD: 15 – 20 % / 0.1 – 0.2 %
Origin & Seeds66 selection
Dark Devil Autoflowering from Seeds66 is built on a cross of Afghani Big Devil XL and Hindu Kush Auto. On one side you get a productive, vigorous automatic line, on the other a Kush background with dense bud structure and strong resin production. Together they create compact plants that can develop striking purple to almost black flowers while still behaving predictably in everyday grows.
For the Seeds66 version we selected phenotypes that combine this behaviour as consistently as possible: medium height, a strong main stem with productive side branches, a clear focus on resin and colour and a life cycle that really stays within the announced window. In our own runs Dark Devil Autoflowering has shown that it can be guided reliably in soil, coco or hydro as long as the grow is planned cleanly from day one.
Growth & cultivation
Dark Devil Autoflowering usually stays compact to medium-sized and will reach up to about 120 cm in most setups. It forms a solid main cola with several productive side branches, making it a great choice for smaller tents, cabinet grows or discrete balcony setups. From seed to harvest you are looking at roughly 10–11 weeks, which also makes it interesting for regions with shorter summers.
Indoors she performs well under 18/6 or 20/4 light cycles. Because autoflowers react more sensitively to stress, it is worth placing Dark Devil directly into the final container and avoiding unnecessary transplanting. A light, airy substrate, moderate EC and a smooth ramp-up of phosphorus and potassium once flowering starts will help her move through the cycle without stalls and with dense, colourful buds.
Outdoors Dark Devil Autoflowering shows her strengths in well-prepared, loose soil or generous pots. She stays discreet in height but can build surprisingly heavy, dark buds for her stature. Preventive pest management, a bit of air movement and avoiding waterlogging go a long way toward hitting the 120–200 g per plant that are realistic for this line.
Seeds66 tip: Give Dark Devil Autoflowering a calm start: germinate gently, place her straight into the final pot and avoid hard nutrient pushes in the first weeks. Once the first Blütenansätze sichtbar werden, leicht mit PK unterstützen und für gute Luftzirkulation sorgen – so nutzt du den 10–11-Wochen-Zyklus aus, ohne die Pflanze unnötig zu stressen.
Aroma & terpenes
The aromatic profile of Dark Devil Autoflowering sits somewhere between fruity, spicy and subtly woody. In the grow room you will notice sweet notes early on, often reminiscent of dark fruit touched by a hint of citrus. Underneath lies a warmer, spicy layer with some earthiness that keeps the bouquet grounded and prevents it from becoming overly perfumed.
When you look at the terpene side, growers frequently associate this strain with limonene, caryophyllene, humulene, pinene and myrcene. In practice that translates to a mix of citrus brightness, spicy depth and a gentle wood tone. In the grinder the buds become noticeably more intense and resinous; in the joint or vaporizer the flavour stays full and present without being harsh and leaves a slightly fruity, spicy trace on the palate.
Effect
The effect of Dark Devil Autoflowering tends to come in waves. First, there is a clear mental lift: an easier mood, a bit more flow in conversations and the feeling of having a little more distance from daily noise. As the session continues, the indica base becomes more dominant – muscles loosen, the body feels heavier and many people notice that inner tension drops away.
With 15–20 % THC she sits firmly in the solid mid-to-strong range. That is enough power for experienced users, but still manageable when dosed with a bit of common sense. Many people reach for Dark Devil Autoflowering later in the day or in the evening when the main tasks are done and it is more about slowing down: music, a series, a good conversation or simply some quiet time on the couch.
Some users report that this profile can help them wind down, fall asleep more easily or soften everyday aches and strains. These experiences are individual and not a substitute for medical advice or treatment, but they show how versatile this strain can feel in real life.
Seeds66 stance
With autoflowering genetics like Dark Devil there is no pause button: the cycle keeps moving, whether the setup is perfect or not. That is exactly why we at Seeds66 only keep lines that behave understandably in realistic conditions and forgive the occasional small mistake. A strain does not have to be hyped, but it should remain predictable over time.
Our approach is simple: a variety only stays in the Seeds66 range if it delivers a comparable picture over several independent runs.
Key traits of Dark Devil Autoflowering
Variety indica-dominant hybrid with ruderalis component
Type autoflowering Seeds66 line
Genetics Afghani Big Devil XL – Hindu Kush Auto
Effect uplifting and relaxing, sociable, made for calm evenings and unhurried conversations
Flavour citrus, spicy, woody with a sweet fruity backdrop
Indoor life cycle 10 – 11 weeks from seed (complete cycle)
Outdoor harvest time approx. 10 – 11 weeks from germination, depending on start date
Indoor yield 500 – 600 g/m²
Outdoor yield 120 – 200 g per plant
Height indoor medium stature, usually up to 120 cm
Height outdoor compact to medium, generally up to 120 cm
THC / CBD 15 – 20 % / 0.1 – 0.2 %
Climate zones well suited to temperate and slightly cooler regions with shorter seasons, balconies, terraces or greenhouses
Seeds66 note dark-coloured autoflower for growers who want compact plants with strong resin production and a visually striking appearance.
Note: At Seeds66, Dark Devil Autoflowering is offered as a dedicated automatic line. Other variants of this strain are currently not part of our range.
Frequently asked questions about this strain
1. Is Dark Devil Autoflowering suitable for beginners?
Yes, as long as the basics are in place. Autoflowers do not tolerate as much trial and error as photoperiod strains, but you don’t have to worry about changing light schedules. If you start in the final pot, avoid overwatering and keep temperatures stable, Dark Devil Autoflowering can be a very good first automatic.
2. How long does Dark Devil Autoflowering really take from seed to harvest?
In most grow rooms the full cycle takes around 10–11 weeks from germination to harvest. Cooler conditions or very late outdoor starts can stretch this slightly, but overall this is a fast line.
3. How intense are the purple and black colours?
Under good conditions many plants show clearly visible purple flowers that can cure down to almost black buds. Slightly cooler night temperatures towards the end of the cycle and sufficient light intensity can help the colour expression, but genetics are the main driver.
4. How strong is the smell during flowering?
Dark Devil Autoflowering develops a noticeable mix of sweet, fruity, citrus and spicy notes once flowering is in full swing. Indoors, a proper carbon filter is strongly recommended if you need to keep things discreet.
5. Is Dark Devil Autoflowering more of a daytime or evening strain?
Most people tend to use her later in the day or in the evening. The uplifting mental component makes her feel lighter than many heavy indicas, but the relaxing body effect is clearly better suited to winding down than to tackling a long to-do list.
6. What pot size works well for Dark Devil Autoflowering?
Indoors, containers between 9 and 15 litres have proven to be a good balance between root volume and space efficiency. Outdoors you can go bigger if you want to push yield – the more room the roots have, the easier it is for the plant to show its full potential.
Seeds66 editorial team
All descriptions are based on our internal tests and documentation in California. We only publish strains that we have documented ourselves. Focus: germination strength, stability and reproducible results for the German-speaking market.
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