Il Diavolo
Cannabis seeds
by Delicious Seeds
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Il Diavolo Feminised Seeds — Speed-Demon Autoflower by Delicious Seeds
Il Diavolo is a feminised autoflowering cannabis seed from Delicious Seeds that crosses Critical Mass with Ruderalis to produce one of the fastest seed-to-harvest cycles you'll find. With 17% THC, dense resin-coated buds, and genuine mould resistance, this Indica-dominant auto is built for growers who want results without babysitting. Three seeds per pack, all feminised, all autoflowering — drop them, water them, and get out of the way.
Why Il Diavolo Feminised Seeds Stand Out
Speed is the whole point of this strain. Il Diavolo's Ruderalis genetics mean the plant flips to flower automatically — no light schedule changes, no timers, no fuss. And the growth rate is genuinely extreme. The plant finishes so quickly that common pests simply don't get enough time to establish a foothold. We've seen growers post about entire cycles wrapping up while their neighbours' photoperiods are still in veg. That's not an exaggeration; it's the Ruderalis doing what Ruderalis does best.
Then there's the mould resistance. Indica-dominant genetics tend to produce tight, dense bud structures — which normally makes them more susceptible to mould, not less. But the speed factor works in Il Diavolo's favour here: the buds don't sit around long enough for botrytis to take hold. If you're growing outdoors in a damp European autumn, or in a tent without perfect humidity control, that matters more than any spec sheet number.
The Critical Mass parent brings the weight and the resin. Expect one dominant central cola with plenty of secondary bud sites, all coated in shiny white trichomes. The dried flower carries a strong fruity aroma — not a subtle background note, but a properly fragrant, room-filling scent that'll remind you why they called the parent strain "Delicious." At 17% THC, the effect is body-heavy and deeply relaxing. Delicious Seeds describe it as "highly narcotic," and from what customers tell us, that's accurate. This is an evening strain, full stop.
Il Diavolo Growing Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Delicious Seeds |
| Seed Type | Feminised Autoflower |
| Genetics | Critical Mass x Ruderalis |
| Dominance | Indica Dominant |
| THC Content | 17% |
| Average Yield | 300g/m² (indoor) |
| Flowering Type | Automatic (light-independent) |
| Mould Resistance | High |
| Aroma | Strong fruity |
| Seeds Per Pack | 3 |
| SKU | CSDS0010 |
Il Diavolo vs Other Fast Autoflowers
If you're weighing Il Diavolo against other quick-finishing autos, here's how it stacks up against two common alternatives in the same category.
| Strain | Genetics | THC | Yield (Indoor) | Key Trait |
|---|---|---|---|---|
| Il Diavolo (Delicious Seeds) | Critical Mass x Ruderalis | 17% | 300g/m² | Extreme speed, mould resistance |
| La Diva Auto (Delicious Seeds) | Indica autoflower | 15% | Moderate | Easy grow, slightly lower potency |
| Critical Mass Auto (typical) | Critical Mass x Ruderalis | 18-20% | 350-450g/m² | Higher yield, longer cycle |
Il Diavolo sits in a sweet spot: it won't out-yield a full Critical Mass auto that takes an extra few weeks, but it'll be done and dried while that plant is still fattening up. If speed and resilience matter more to you than squeezing every last gram, this is the one we'd pick. If maximum yield is the priority and you've got time, look at a standard Critical Mass auto instead.
How to Grow Il Diavolo Feminised Seeds
- Germinate your Il Diavolo seeds using the paper towel method or by placing them directly into a moist, light soil mix. Taproots usually appear within 24-72 hours.
- Plant the germinated seed about 1cm deep in its final pot. Because autoflowers don't like transplanting — the stress can stunt them mid-cycle — use an 18L pot from the start to prevent root binding.
- Provide 18-20 hours of light per day from seedling stage onwards. Il Diavolo flowers automatically regardless of light cycle, but more light hours mean more energy for bud production. A 20/4 schedule works well for most growers.
- Start with a light nutrient mix during the seedling phase and gradually increase the dosage as the plant enters vegetative growth. Autoflowers are sensitive to overfeeding, so err on the side of less rather than more.
- Watch for the single dominant central cola forming. Il Diavolo naturally produces one main cola with secondary bud sites — light stress training (LST) in the first two weeks of veg can open up the canopy and improve light penetration to those lower sites.
- Maintain relative humidity below 50% during flowering to complement the strain's natural mould resistance. Good airflow around the canopy helps too.
- Harvest when trichomes shift from clear to milky-white with some amber. Given the speed of this strain, check trichomes daily once you see the buds swelling — the window between "nearly ready" and "done" is short.
What to Expect From Il Diavolo — Honest Take
Here's the thing about Il Diavolo: it does exactly what it promises, but you need to set your expectations correctly. The 300g/m² average yield is honest — not inflated, not sandbagged. You're not going to pull monster harvests from a plant that races through its lifecycle this fast. That's the trade-off, and it's a fair one. What you get instead is a quick turnaround, minimal risk of crop loss to mould or pests, and dried flower that genuinely delivers on potency and flavour.
The fruity aroma is the real standout. When you crack open a jar of properly cured Il Diavolo, the smell fills the room. It's sweet, fruity, and unmistakably loud — not something you'd want to open on a bus. The resin production is impressive for an auto of this speed; the buds come out absolutely caked in white trichomes, sticky to the touch, and dense enough to feel substantial when you break them apart.
The one honest limitation: don't expect this to compete with photoperiod strains on yield or THC ceiling. 17% THC is solid — more than enough for a heavy, body-focused effect — but if you're chasing 25%+ numbers, you're looking at the wrong category entirely. Il Diavolo is the best autoflower for growers who value speed and resilience over raw numbers. If that's you, it's hard to beat.
Complete your setup with a proper grow tent and ventilation kit. If you're running Il Diavolo indoors, a carbon filter is non-negotiable — the fruity aroma is strong and your neighbours will notice. A basic pH meter pays for itself on the first grow by preventing nutrient lockout, and a jeweller's loupe or pocket microscope makes trichome checking easy when harvest time comes around fast.
Frequently Asked Questions
Is Il Diavolo an Indica or Sativa?
Indica dominant. The Critical Mass parent brings heavy Indica genetics, and the Ruderalis side adds the autoflowering trait without shifting the effect profile. Expect a body-heavy, deeply relaxing result rather than anything cerebral or energising.
How long does Il Diavolo take from seed to harvest?
Il Diavolo is one of the fastest autoflowers available. The exact number of days varies by conditions, but the Ruderalis genetics drive an extremely rapid lifecycle — fast enough that common pests don't have time to establish. Most growers report finishing well ahead of standard autoflower timelines.
Can I grow Il Diavolo outdoors?
Yes. Il Diavolo's mould resistance and speed make it well suited to outdoor growing, even in cooler, damper climates. The plant finishes before autumn humidity peaks, which is exactly when most outdoor crops run into trouble. Just make sure it gets direct sunlight for as many hours as possible.
What yield can I expect from Il Diavolo?
The average indoor yield is 300g/m². That's realistic for a fast autoflower — you're trading maximum weight for speed and resilience. Light stress training in early veg can help push yields toward the upper end of that range.
Is Il Diavolo good for beginners?
It's one of the most beginner-friendly seeds we carry. Feminised means no males to identify and remove. Autoflowering means no light schedule management. Mould resistant means more margin for error on humidity. Start with a light nutrient mix, don't overwater, and Il Diavolo does the rest.
Do I need to change the light cycle for Il Diavolo?
No. As an autoflower, Il Diavolo transitions from vegetative growth to flowering automatically, regardless of light cycle. Most growers run 18-20 hours of light throughout the entire cycle for maximum energy input, but the plant will flower on any schedule.
What does Il Diavolo smell and taste like?
Strong fruity aroma — properly fragrant, not subtle. The dried buds fill a room when you open the jar. The resin coating is thick and sticky, and the scent carries through to the taste. If you're growing indoors, a carbon filter is strongly recommended.
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.