secure connectionA high that's critically acclaimed and packed with zesty Jack personality. Pine, citrus, and pepper meet easy growing and fast results. This auto is the real deal, start to finish.
A high that's critically acclaimed and packed with zesty Jack personality. Pine, citrus, and pepper meet easy growing and fast results. This auto is the real deal, start to finish.
Critical Jack Auto is what happens when two legends, Jack Herer and Critical, get together. Then, some clever breeder adds Ruderalis to make the whole thing stupidly easy to grow. This is an autoflower that’s got a bit of everything: upbeat energy, laid-back body feels, a citrusy pine flavor with peppery spice, and a structure that behaves whether you're running a tent in the city or letting it stretch its legs outdoors. It’s easygoing, fairly quick, and just chunky enough to keep things interesting.
If you’ve ever wanted a Jack Herer-style buzz without the long flowering time or the need to micromanage every stage of the grow, this is your ticket. Expect satisfying yields, bright lemon and pine notes, and a nicely balanced high that somehow keeps you creative while gently gluing you to your seat.
Up for a longer grow with even bigger rewards? The Critical Jack photoperiod version has the potential to produce serious weight.
This strain is built from three pillars: the legendary Jack Herer, the yield beast Critical Mass, and a sturdy dose of Ruderalis to trigger flowering without any help from light schedules. Jack Herer brings the cerebral zing. Critical adds bulk and speed. Ruderalis makes sure the whole thing does its thing on autopilot. It’s the kind of hybrid that wears its heritage well, offering potency, productivity, and refreshing reliability.
Don’t let the modest THC levels fool you. Critical Jack Auto hits with a clear-headed burst of euphoria right off the bat. Very Jack. It’s a social high, a creative high, a “maybe I will finally paint that thing” kind of high. But as it settles, the Critical side kicks in with a lazy, contented body stone that doesn’t flatten you. It just slows the roll.
Flavor-wise? Think spicy lemon tea brewed in a pine forest. You’ll catch sweet floral notes on the inhale and a bite of peppery zest on the exhale. It’s balanced, bold, and a little nostalgic for old-school smokers.
With THC levels sitting at 15% and just a trace of CBD at 0.20%, Critical Jack Auto leans into functional enjoyment. It’s potent enough for seasoned users to feel it, but tame enough to keep things productive, or at least mildly functional. It won’t leave you staring at the fridge wondering why you opened it.
This strain is built on a terpene stack that includes beta-caryophyllene, limonene, and both alpha and beta pinene. Limonene carries the lemon brightness. Pinene adds that forest-floor sharpness. Caryophyllene rounds it out with warmth and spice. The result? A profile that smells as good as it smokes. Complex, grounding, and just a little cheeky on the tongue.
Beginner-friendly without being boring. Critical Jack Auto doesn’t need much hand-holding, which makes it ideal for first-timers or anyone who wants to set it and forget it. It’s resilient, fairly forgiving, and doesn’t stress easily. Just give it enough light and decent airflow, and it will do the rest.
Indoors, it stays nicely manageable at around 80 cm to 140 cm, great for tents or stealth setups, while still pumping out some impressive flower. Outdoors, it can stretch a bit more, topping out between 100 cm and 150 cm, but it won’t grow unruly. This one does well in Mediterranean or temperate zones but also handles cooler mountain climates if given a good start. Whether you're working with a sunny balcony, a quiet garden, or a greenhouse, Critical Jack Auto is adaptable and low-maintenance.
You’re looking at a flowering window of around 56 to 63 days. Indoors, yields typically hit around 250 to 350 gram per m2. Outdoors, you can expect somewhere in the neighborhood of 350 to 450 gram per plant under decent conditions. Not bad at all for something that practically grows itself and doesn’t demand a full grow cycle.
Critical Jack Auto is one of those rare autos that nails the balance between performance and personality. It's reliable, flavorful, and surprisingly generous for an autoflower. Whether you're growing in a closet or the back corner of your yard, this one won’t disappoint. Pick up your seeds from WeedSeedsExpress and get them growing. Fast shipping, fresh stock, and support from real growers who’ve actually run this stuff.
Click here for the full strain description.
| Lineage | Jack Herer X Critical X Ruderalis |
| Flowering Type | autoflower |
| Gender | feminized |
| Genotype | Indica dominant |
| Ratio | 50 % Sativa / 30 % Indica / 20 % Ruderalis |
| Grower Profile | Beginner |
| THC | Up to 15.00% |
| CBD | Up to 0.20% |
| Yield Indoor | Up to 350 gr./m2 |
| Yield Outdoor | Up to 450 gr./plant |
| Height Indoor | Up to 140 cm |
| Height Outdoor | Up to 150 cm |
| Climate | Arid, Mediterranean, Mountains, Temperate |
| Flowering Time | 56 to 63 days |
| Flavors | Pine, Spicy, Lemon, Flowery, Sweet, Pepper |
| Terpines | Beta Pinene, Alpha Pinene, Beta Caryophyllene, Linalool, Limonene |
| Effects | Relaxed, Creative, Euphoric, Lazy |
Received my seeds on time. Great customer service. Thanks.
got my seeds today. ordered mine 3 days ago. fast delivery and great customer service. tysm..
Fast shipping, great quality. I received my seeds sooner than expected. Customer service is awesome. Thanks WSE! I’ll update again after harvest.
What does Critical Jack Auto taste and smell like?
Bright citrus (lemon) with sweet notes, pine, and a spicy/herbal incense from the Jack Herer side, finished by a light skunky undertone.
What are the effects and typical THC level of Critical Jack Auto?
An uplifting, clear-headed and creative high with a relaxing body feel; balanced with a slight sativa lean. THC is typically around 17–20%, with low CBD.
How long does Critical Jack Auto take from seed to harvest?
About 10–11 weeks from seed to harvest under an 18/6 or 20/4 light schedule.
What yields can I expect from Critical Jack Auto indoors and outdoors?
Indoors up to 500 grams per m2 with strong light and good nutrition; outdoors up to 150 grams per plant in ideal conditions.
How tall does Critical Jack Auto grow?
Compact structure: around 80 cm indoors and up to about 120 cm outdoors.
Is Critical Jack Auto suitable for beginners, and what care does it need?
Yes. It’s easy and forgiving: moderate feeding, good airflow, stable pH, and avoid overwatering. Keep temperatures steady and light intensity high.
What climate and temperatures does Critical Jack Auto prefer?
Thrives in temperate to warm climates. Ideal daytime range is 21 °C-26 °C; avoid prolonged drops below 16 °C.
Is Critical Jack Auto feminized and autoflowering? What light schedule should I use?
Yes—feminized autoflowering seeds. Run 18/6 or 20/4 from start to finish; no 12/12 switch is required.
Can I train Critical Jack Auto (LST, topping, etc.)?
Use low-stress training (bending and tie-downs) and light defoliation. Avoid topping unless experienced, and do it very early if attempted.
How strong is the smell of Critical Jack Auto—do I need a carbon filter?
The aroma becomes strong in late flower, so a quality carbon filter is recommended for indoor grows.
Ordering Information
Our seed bank is primarily located in the EU (Haarlem, The Netherlands), so we can offer lightning-fast shipping to every country in the European Union.
We also have warehouses in the USA & Canada so that our customers across the Atlantic can receive their seeds just as quickly as our European customers.
You can find further details about our ordering conditions related to shipping, payment, and guarantees below.
Our goal is to give you the best experience possible! We ship your order quickly, offer free worldwide shipping, use discreet packaging, and guarantee delivery on all tracked orders.
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Our seeds have an average germination rate of 96%. To make sure you have a 100% germination rate, we add free seeds with every standard seedpack (Not applicable to 3-packs or BOGO Deals). In case of germination issues, feel free to contact us any time so we can work towards a solution.
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