Sour Jack Feminised
Growing Sour Jack Feminised in New Zealand: a sativa at 15% THC, uplifted, energetic. Flowering window and height are on the page where we hold them, blank where we do not.
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 2026-09-14, from a tray sample of 200.
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 Sour Jack Feminised
Days 1 to 14. Sour 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.
Sour 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. After the flip the plant may double. Whatever shape the canopy is at that point is roughly the shape you harvest.
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 Tall.
Harvest. Published window: 9-12 weeks. 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.
Effect Profile
Uplifted, Energetic is the consensus, and consensus is worth exactly what it sounds like β a starting point. 15% THC sets the scale; limonene and the terpenes alongside it shape the character rather than the strength.
Onset is quick by inhalation and slow by ingestion, which is where most bad experiences begin. Expect a mental lift first, with the body catching up later.
If potency is what you are shopping for, the high-THC seeds category is sorted for it.
The Terpenes
Limonene leads, pinene sits behind it, and terpinolene runs underneath.
This trio is a common signature in well-regarded cultivars, which is not an accident: limonene carries weight, pinene adds definition, terpinolene 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 Sour Jack? Growers who want to control plant size and harvest date, and have the vegetative space to use that control. Anyone past their first grow.
Still deciding? The indoor-friendly genetics list is the narrower place to start.
Published Figures
- Finishes in 9-12 weeks
- Under lights: 300g/m2
- Grown out: 500g/plant
- Height: Tall
- Difficulty: medium
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
Feminised Premium
Seeds
authenticity
lining
number
Related Strains
Lemon Jack Feminised
Lemon Jack Feminised, a sativa listed at 15% THC and described as energetic, focused, happy. Posted unbranded and tracked to any New Zealand address, with the grow figures we could trace on the listing.
Pineapple Jack Feminised
Sativa genetics for a New Zealand grow. Pineapple Jack Feminised carries a listed 18% THC and reads happy, relaxed, uplifted. Priced in NZD, GST included, delivered nationwide.
Purple Diesel Feminised
Purple Diesel Feminised β sativa, 18% THC on the listing, happy, relaxed, uplifted. Sent in plain packaging with NZ Post tracking and covered by our germination promise.
3 Kings Feminised
3 Kings Feminised for New Zealand growers. Sativa, listed 16% THC, happy, energetic, creative. Free postage over $150, flat $14.99 below it, both islands.
Where Sour Jack Feminised Comes From
Documented parentage is Sour Diesel 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.