Sir Jack Auto

Sir Jack Auto Cannabis Seeds by Exotic Seeds

Sir Jack Auto is an autoflowering feminised cannabis seed from Exotic Seeds that delivers Jack Herer-lineage genetics in a compact, fast-finishing package. Bred from Sir Jack crossed with Auto Skunk, this 50/50 sativa/indica hybrid produces resin-coated buds with a sharp lemon-incense aroma — and it does it all in roughly 12 weeks from seed, no light schedule changes needed.

Why Sir Jack Auto Seeds Stand Out

The original Sir Jack is a direct descendant of Jack Herer — one of the most decorated genetics in cannabis breeding history. Exotic Seeds took that pedigree and crossed it with Auto Skunk to create something that keeps the resin output and flavour profile of its photoperiod parent but flowers automatically. That's the bit that matters: you get Jack Herer-quality trichome coverage without needing to flip your lights to 12/12.

We've seen plenty of autoflowering strains that trade potency for convenience. Sir Jack Auto doesn't do that. The resin production is comparable to non-autoflowering strains — Exotic Seeds are quite specific about this, and the frosty bud shots back it up. The 6-week flowering period within a total 12-week lifecycle means you're looking at a genuinely quick turnaround without sacrificing bag appeal.

The honest limitation? At 100-120 cm, she's on the taller side for an auto. If you're working with a micro grow tent (60x60 cm or under), you'll want to keep an eye on vertical space and potentially do some low-stress training early on. In a standard 80x80 or 100x100 setup, she'll fit comfortably and reward you with dense, citrus-scented colas.

Sir Jack Auto Genetics and Grow Specs

Knowing exactly what you're planting takes the guesswork out of your grow. Here's what Exotic Seeds puts on the tin — and what we've cross-referenced from grower reports.

Compared to a photoperiod Jack Herer cross, you're shaving weeks off the total grow time. Compared to smaller autos like most Lowryder descendants, you're getting significantly more yield per square metre. The 500-550 g/m2 figure puts Sir Jack Auto in the upper tier of autoflowering producers — most autos sit in the 350-450 g/m2 range.

Aroma, Flavour, and What to Expect from Sir Jack Auto

Crack open a cured jar of Sir Jack Auto and the first thing that hits you is lemon zest — sharp, clean, almost like someone grated a fresh lemon rind right under your nose. Underneath that, there's a deeper incense-like base note that's unmistakably Jack Herer heritage. It's the kind of aroma that fills a room and lingers on your fingers.

The flavour follows the nose. Citrus-forward on the inhale, with that resinous, slightly spicy incense quality on the exhale. If you've ever grown or smoked a Jack Herer cut, you'll recognise the family resemblance immediately. The Auto Skunk parent doesn't dominate the terpene profile — it's more of a structural contributor, keeping the plant compact and autoflowering while Sir Jack's flavour genetics do the talking.

The effect leans cerebral and energetic thanks to the sativa side. It's traditionally described as uplifting and social — the kind of smoke that puts a grin on your face at a barbecue rather than melting you into the sofa. That said, the indica half rounds things out with a physical relaxation that keeps the sativa energy from becoming racy. One thing to note: this isn't a strain you'd typically reach for when you need to sit down and concentrate on detailed work. It's better suited to social settings and creative downtime.

How to Grow Sir Jack Auto Seeds

1. Germinate your Sir Jack Auto seeds using the paper towel method or directly in a small pot of moist, airy soil. Autoflowers don't love transplanting, so starting in the final container (11-15 litre) saves stress on the plant.
2. Provide 18-20 hours of light per day from seedling stage through harvest. Because she's autoflowering, there's no need to switch to a 12/12 light cycle — the plant transitions to flowering on her own internal clock.
3. Keep humidity around 60-70% during the vegetative stage (first 4-6 weeks), then drop to 40-50% once flowers start forming. This strain produces dense buds with heavy resin, so good airflow and lower humidity in late flower help prevent mould.
4. Feed lightly during the first 2-3 weeks — autoflowers are sensitive to overfeeding early on. Increase nutrients gradually as the plant enters its rapid growth phase around week 3-4.
5. Watch the vertical growth. At 100-120 cm, Sir Jack Auto is taller than many autos. If headroom is tight, gentle low-stress training (bending and tying down the main stem) during weeks 2-4 opens up the canopy and encourages more even bud development.
6. Expect visible flowers by week 5-6. The 6-week flowering period means you should start seeing trichome development ramp up quickly. Harvest when trichomes shift from clear to milky-white with a few amber heads — typically around week 11-12 from germination.
7. Dry in a dark, ventilated space at 18-20 degrees Celsius and 55-60% humidity for 7-10 days. Cure in glass jars for at least 2 weeks to let those lemon and incense terpenes fully develop.

Sir Jack Auto vs Photoperiod Jack Herer Strains

The obvious question: why go auto when photoperiod Jack Herer genetics exist? Here's the practical breakdown.

The yield gap is smaller than you'd expect. Sir Jack Auto at 500-550 g/m2 is genuinely competitive with many photoperiod strains, and you're getting there in 12 weeks flat. For growers who want to run multiple cycles per year, or outdoor growers in climates where the season is short, the autoflowering format is a clear win. If you've got the space and patience for a full photoperiod run, you might squeeze out a bit more yield — but the difference isn't dramatic enough to dismiss the auto version.