Black Jack Auto
Sativa genetics for a New Zealand grow. Black Jack Auto carries a listed 23% THC and reads euphoric, focused, energetic. Priced in NZD, GST included, delivered nationwide.
What the seed lot did on the bench
Every lot is checked before it goes on the shelf, and the yield figures come from New Zealand growers who sent us a harvest weight against a batch code. This lot was read on 2026-09-21, from a tray sample of 320.
Outdoor figures come from a New Zealand season, so they run below what the same cultivar reaches somewhere with a longer, drier autumn. Treat them as what this plant does here. The full report for this lot sets out the method and the terpene panel.
About Black Jack Auto
Days 1 to 14. Black Jack cracks on damp paper towel inside about two days and is through the medium by day three, given warmth and patience rather than intervention. Seedlings want humidity near 70% and no nutrients at all β the seed carries everything for the first week. By the end of the fortnight you are looking for even node spacing rather than height; a stretched seedling is a light problem, not a vigour signal. New to this? The free seeds on offer are a low-stakes way to practise the germination step.
Black Jack Through the Grow
Weeks 3 to 6. Growth stops being tentative. This is when training earns its keep: bend rather than cut if you are unsure, because a bent branch recovers in a day and a topped one costs a week. Expect vertical enthusiasm and plan the ceiling now.
The transition. There is no flip. Flowering starts on its own, which means any stunting from an over-eager early feed is now permanent.
Mid-flower. Bud sites fill and the aroma arrives β usually the point where extraction stops being optional. Feed heavier now, but watch the leaf rather than the schedule.
The last fortnight. Ease off nitrogen, drop the night temperature a little, and stop feeding before you think you should. Final height for this cultivar is published at 40-110 cm.
Harvest. Published window: 9 weeks from germination. Trichomes decide. Cut in sections if ripening is uneven β most plants ripen top-down and there is no prize for taking it all at once.
Reading the Effects Honestly
Effect descriptions are the least reliable part of any seed listing, this one included. What is defensible: this is a 20/80 sativa at 23% THC, commonly described as euphoric, focused, energetic, with pinene leading the terpene profile.
What is not defensible is any promise about how it will feel for you. Dose, tolerance, setting and the phenotype you happen to pop all move the outcome more than the strain name does.
Growing a few and selecting the keeper is the only way to know. That is what a pack of autoflowering seeds is for.
The Terpenes
Pinene leads, limonene sits behind it, and caryophyllene runs underneath.
This trio is a common signature in well-regarded cultivars, which is not an accident: pinene carries weight, limonene adds definition, caryophyllene keeps it from being one-note. It reads clearly on a first opening rather than needing to be hunted for.
Who It Suits
Who does well with Black Jack? Growers with limited headroom or no interest in managing timers. Apartment balconies. Anyone wanting more than one run in a season. First-timers included β the genetics are forgiving.
Still deciding? The indoor-friendly genetics list is the narrower place to start.
Published Figures
- Finishes in 9 weeks from germination
- Under lights: 400-550 g/m2
- Grown out: 40-250 g/plant
- Height: 40-110 cm
- Difficulty: easy
Reported Effects
Descriptive, and ordered by how prominently each one appears in the sources we hold. Not a survey, and not a measurement.
Best For
Where It Sits
The Numbers
How it arrives
Regular
Seeds
authenticity
lining
number
Related Strains
Black Jack Feminised
Black Jack Feminised β sativa, 23% THC on the listing, euphoric, focused, energetic. Sent in plain packaging with NZ Post tracking and covered by our germination promise.
Kahuna Auto
Sativa genetics for a New Zealand grow. Kahuna Auto carries a listed 20% THC and reads euphoric, creative, calm. Priced in NZD, GST included, delivered nationwide.
Super Jack Auto
Super Jack Auto β hybrid, 26% THC on the listing, creative, focused, energetic. Sent in plain packaging with NZ Post tracking and covered by our germination promise.
Cinderella 99 Feminised
Sativa genetics for a New Zealand grow. Cinderella 99 Feminised carries a listed 22% THC and reads euphoric, sleepy, energetic. Priced in NZD, GST included, delivered nationwide.
Where Black Jack Auto Comes From
Documented parentage is Black Domina Γ Jack Herer. Where a cultivar's origin is recorded we name it on this page; where it is contested or simply unknown, the field stays empty rather than being filled with something plausible.
We did not originate the cultivars in this catalogue and do not claim to have. What we do is select and stabilise the lines we sell, so that a pack grows out more uniformly than an unworked one β which matters more in New Zealand than in most places, because an outdoor grower here is working to a frost date rather than an open-ended season. The stabilisation programme sets out how that works and what it does not cover.
Every pack is covered by our germination promise: follow the method in the germination guide and seed that fails to open is replaced free within 30 days.