Auto Cinderella Jack

Auto Cinderella Jack Cannabis Seeds by Dutch Passion

Auto Cinderella Jack is a feminised autoflowering cannabis seed bred specifically to push THC levels as high as they'll go in an auto format. Dutch Passion partnered with Buddha Seeds from Spain — a team with serious autoflower breeding credentials — and selected parent genetics based on one criterion only: THC content. The result? An autoflower that's been independently measured at 20% THC on average, with a licensed Portuguese medical cannabis producer (Pure Healing) recording a staggering 28% THC from a single plant. That's photoperiod territory from a seed that doesn't care about light schedules.

Auto Cinderella Jack Genetics and Lineage

The genetic backbone of Auto Cinderella Jack comes from crossing Jack Herer with Cinderella 99, then introducing autoflowering capability through Magnum genetics. Jack Herer brings that classic sativa-leaning energy and resin production. Cinderella 99 — a strain famous for punching well above its weight in potency — adds raw THC potential and a compact structure. The Magnum parent does double duty: it contributes the ruderalis autoflowering gene while also bringing yield potential that many early autos lacked.

Dutch Passion and Buddha Seeds reportedly ran their selection process purely on THC numbers. No filtering for flavour profiles, no prioritising bag appeal — just cannabinoid content, generation after generation. That single-minded approach is what separates Auto Cinderella Jack from the dozens of "high-THC auto" claims floating around seed banks. The 20% average THC isn't marketing fluff; it's backed by lab results from multiple independent grows.

Growing Auto Cinderella Jack Seeds

Auto Cinderella Jack finishes her entire life cycle in 10-11 weeks from germination. No light schedule changes needed — run her under 18/6 or 20/4 from start to finish and she'll handle the rest. That compressed timeline means you can realistically pull two or even three harvests per year from the same indoor space.

One grower documented a dry harvest of 113g (4oz) from a single Auto Cinderella Jack plant grown in soil with 30% added perlite — no fancy hydro setup, no CO2 supplementation, just solid basics done right. The Magnum genetics in her lineage contribute to heavy side branching, which means the plant distributes bud sites across a wider canopy rather than concentrating everything in one main cola. That branching structure responds well to low-stress training if you start early enough in veg.

A word on feeding: this strain can be sensitive to heavy nutrient loads. One experienced grower found that the manufacturer's full recommended dose of bloom nutrients — around 1,200 ppm — caused leaf tip burn. Backing off to roughly 800 ppm and alternating with a mini-flush every 2-4 feedings kept things healthy. Start conservative and work up. With autos, you've got a narrow window to correct overfeeding before it costs you yield.

1. Germinate seeds using the paper towel method or directly in a small pot of lightly moistened seed-starting mix. Keep temperatures between 22-26°C.
2. Transplant into your final container early — ideally within the first week. Autos don't love root disturbance, so going straight into an 11-15 litre pot avoids transplant shock.
3. Set your light schedule to 18/6 or 20/4 and leave it there for the entire grow. No need to switch to 12/12.
4. Begin light feeding around week 2-3 with a quarter-strength nutrient solution. Increase gradually, watching for tip burn as your guide.
5. Consider gentle low-stress training (LST) from week 3 to open up the canopy and expose lower bud sites to light. Avoid topping — most autos don't recover quickly enough.
6. Switch to bloom nutrients when you see the first pre-flowers, typically around weeks 4-5.
7. Flush with plain water for the final 7-10 days before harvest. Check trichomes with a jeweller's loupe — you're looking for mostly cloudy with a few amber.
8. Dry in a dark, well-ventilated space at 18-20°C and 55-60% humidity for 7-10 days, then cure in glass jars for at least 2 weeks.

Why Auto Cinderella Jack Stands Out Among Autoflowers

We've carried a lot of autoflowering strains over the years, and the honest truth is that most "high-THC auto" claims don't hold up once you get them under a light. Auto Cinderella Jack is different. The 28% THC result from Pure Healing in Portugal is the highest THC level ever recorded for an autoflowering strain — and while your home grow probably won't hit that exact number, the 20%+ average is genuinely achievable with decent conditions.

The one honest limitation: don't expect the terpene complexity of a carefully selected photoperiod cut. Dutch Passion bred this strain for raw cannabinoid power, not flavour. You'll get a functional, pleasant smoke — but if you're chasing a specific taste profile, something like Auto Blackberry Kush or Auto Critical Orange Punch from the same seed bank might scratch that itch better. Auto Cinderella Jack is the strain you grow when potency is the priority and convenience is the method.

Compared to photoperiod Jack Herer — which can take 9-10 weeks of flowering alone, plus however long you veg — Auto Cinderella Jack delivers comparable THC in roughly 10-11 weeks total, seed to harvest. For growers with limited space or patience, that's a meaningful difference. You're trading some yield potential and a bit of flavour nuance for a dramatically simpler, faster grow cycle. For most home growers, that trade-off makes complete sense.

THC Potency: What the Numbers Actually Mean

A 20% average THC level puts Auto Cinderella Jack firmly in the range of many respected photoperiod strains. The 28% peak measurement from Pure Healing of Portugal — a licensed medical cannabis producer with proper lab testing — suggests the genetic ceiling on this strain is remarkably high for an auto. According to research on hierarchical chemotaxonomic differentiation in cannabis, the identification of distinct THC-dominant sub-clusters has direct breeding consequences, as breeders targeting specific cannabinoid profiles can now select with greater precision (PMC13074809). Dutch Passion's THC-focused selection process for Auto Cinderella Jack aligns directly with this approach.

What does 20%+ THC feel like in practice? This is a strain that hits quickly and firmly. The Jack Herer and Cinderella 99 parentage leans sativa, so expect a cerebral, energising character rather than a heavy body stone. That said, at these THC levels, less experienced consumers should approach with respect. A little goes a long way.