secure connectionCritical Jack feminised is an uplifting cannabis strain that brings a burst of energy and focus, with a unique pepper flavour and a delightful pine scent. Perfect for growers seeking massive outdoor yields with ease.
Critical Jack feminised is an uplifting cannabis strain that brings a burst of energy and focus, with a unique pepper flavour and a delightful pine scent. Perfect for growers seeking massive outdoor yields with ease.
If you want a strain that keeps you on your toes but still lets you enjoy the ride, Critical Jack is your go-to. This sativa-heavy hybrid blends the cerebral lift of Jack Herer with the solid, high-yielding backbone of Critical. It’s got everything: fast flowering, big harvests, and a vibe that’ll keep you upbeat without getting too overwhelming. Plus, it’s not a drama queen when it comes to pests or fungal issues. This one handles stress like a champ. Whether you're a seasoned grower or just starting out, Critical Jack is one that’ll make your grow feel like a win from start to finish.
Want to keep things streamlined while still pulling great bud? Check out the Critical Jack Auto autoflowering version. It's built for speed and convenience without sacrificing quality.
Critical Jack is born from two heavyweights: Jack Herer and Critical. Jack brings that uplifting, creative kick, while Critical adds the muscle for big yields and sturdy growth. The result? A strain that’s not only fast to finish but also easy to handle, giving you a strain that’s great for both the casual grower and the serious cultivator.
When you take a hit of Critical Jack Fem, you’ll feel that rush of mental clarity and energy, perfect for staying productive during the day. It’s got that nice, balanced high that leaves you feeling happy, focused, and ready to take on whatever’s next. The flavour’s not too shabby either. Expect a mix of piney, lemony zest with a spicy, sweet kick. Think of it like a smooth, piney punch with a little extra flair from the peppery notes. Definitely one for those who enjoy a bit of complexity in their smoke.
Critical Jack’s THC comes in at a solid 20% THC, giving you a nice, potent buzz without leaving you completely couch-locked. The CBD content is pretty low at 0.30%, which means it’s all about the THC effects: a heady, energizing high that’ll keep you moving without dragging you down.
The terpenes in Critical Jack are what really make it stand out. Nerolidol adds a bit of floral sweetness, while trans nerolidol brings in a touch of freshness. There’s also a nice mix of earthy and spicy notes, thanks to alpha bisabolol and delta 3 carene. Add in a bit of terpinolene, alpha pinene, and limonene, and you’ve got a flavour profile that’s as energizing as it is complex.
Critical Jack is pretty straightforward to grow. It’s a forgiving strain, especially when it comes to fungal resistance, so even if you’re new to this whole thing, you won’t be losing sleep over mould or mildew. It’s beginner-friendly but still gives experienced growers that satisfaction of a quality, reliable crop.
Whether you’ve got an indoor setup or you’re out there letting the sun do its thing, Critical Jack Fem adapts like a pro. It’s got a little more of an affinity for Mediterranean and temperate climates, but it’ll do just fine as long as it gets plenty of sunlight. Outdoors, make sure you’re giving it the light it craves, and indoors, it’s just as happy under your grow lights.
This one’s quick, coming in at 56 to 63 days of flowering. You won’t be waiting too long to see those buds come through. Indoors, you can expect 500 grams per m2 to 600 grams per m2. Outdoors, it really stretches its legs, delivering a nice 900 grams per plant to 1200 grams per plant. All in all, it’s a strain that pulls its weight and then some.
Ready to get your hands on Critical Jack seeds? You’re just a click away. With fast worldwide shipping and our germination guarantee, there’s no reason to wait. Add this top-notch strain to your basket and enjoy everything it has to offer: from big yields to those uplifting, creative vibes.
Click here for the full strain description.
| Lineage | Jack Herer X Critical |
| Flowering Type | photoperiod |
| Gender | feminized |
| Genotype | Sativa dominant |
| Ratio | 60 % Sativa / 40 % Indica |
| Grower Profile | Beginner |
| THC | Up to 20.00% |
| CBD | Up to 0.30% |
| Yield Indoor | Up to 600 gr./m2 |
| Yield Outdoor | Up to 1200 gr./plant |
| Height Indoor | Up to 150 cm |
| Height Outdoor | Up to 170 cm |
| Climate | Temperate, Mediterranean |
| Flowering Time | 56 to 63 days |
| Flavors | Pine, Flowery, Lemon, Spicy, Sweet, Pepper |
| Terpines | Nerolidol, Trans Nerolidol, Alpha Bisabolol, Delta 3 Carene, Terpinolene, Alpha Pinene, Limonene, Eugenol, Alpha Phellandrene, Cymene, Gamma Terpinene |
| Effects | Energetic, Focused, Happy, Relaxed, Uplifting |
I got some fat, resinous buds,, that smells citrusy and piney and sweet all at the same time. The smoke is sweet and uplifting compared to other strains I've tried. The growth process is pretty beginner-friendly too. No much hassle. Thank you.
No problems with germination. Nice small buds so far, but i still have a long way to go.
2 found this usefulHigh quality seeds, fast shipping and good support
2 found this usefulThis is my 3th time i'm growing critical jack. Just love this strain. Such a nice structure and creazy buds. The effect is just amazing as the plant. Very intense on the mind but balanced. Recommend for growers who like a strong weed.
4 found this usefulAlthough I don't have much breeding experience, I haven't experienced any problems. I have applied a growth phase of 3.5 weeks and finally let the plants bloom for 8.5 weeks. With a result of just under 400 grams per m2, I am absolutely satisfied
2 found this usefulWhat does Critical Jack taste and smell like?
Citrus (lemon), pine, incense/woody notes with sweet herbal and spicy Haze accents.
What are the effects and typical THC/CBD levels of Critical Jack?
Uplifting, energetic, and creative head high with a relaxing body finish. THC typically 17–21%; CBD low (<1%).
How long does Critical Jack take to flower indoors?
Indoors, expect about 9–10 weeks of flowering.
What yield can Critical Jack produce indoors and outdoors?
Indoor: 450 grams per m2–600 grams per m2. Outdoor: 500 grams per plant–1000 grams per plant in ideal conditions.
How tall does Critical Jack grow indoors and outdoors?
Indoor: 80 cm–120 cm. Outdoor: 180 cm–250 cm, with notable stretch after the flip.
Is Critical Jack suitable for beginners?
Yes. Critical Jack is hardy and forgiving; manage odor and provide moderate feeding for best results.
Is Critical Jack photoperiod or autoflower?
Photoperiod feminised. Switch to 12/12 to initiate flowering; outdoors it flowers as days shorten.
What climate does Critical Jack prefer and when is the outdoor harvest?
Prefers warm, dry, sunny climates (Mediterranean/temperate). Ideal daytime temps around 21 °C–26 °C. Northern Hemisphere harvest: late September to early October.
Does Critical Jack respond well to training (SOG/SCROG, topping, LST)?
Yes. It responds very well to topping, LST, SCROG, and light defoliation; expect 1–2× stretch.
How long from seed to harvest indoors for Critical Jack?
Typically 13–16 weeks total indoors (4–6 weeks veg plus 9–10 weeks flower).
Ordering Information
We are one of the few seed banks still shipping to Australia and have many happy Ozzy customers.
Orders to Australia typically take between 10 & 26 business days.
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.
Free shipping
Delivery without tracking is always free of charge. Tracked shipment is currently unavailable.
Discreetly packaged
Your privacy matters. Our shipments are super discreet, with no mention of cannabis or seeds anywhere.
Delivery time
You can expect your order within 10 to 26 business days.
Free replacement
In rare cases where your seeds get damaged or lost during shipping, we’ll replace them for free!
We offer the following payment options:
Domestic Bank Wire Transfer
Fast and secure bank wire transfer to our Australian bank account.
Cash
Sending cash is totally anonymous and without any fees. Make sure you send cash with registered tracked mail.
Crypto
Anonymous payment powered by Coingate. Binance Pay available
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.
Our delivery guarantee applies for all tracked shipments, which are available for almost all countries we deliver to. You can see if we offer tracked shipments to your country on our shipping and delivery page.
While our delivery guarantee is available for tracked shipments only, we ensure to initiate an inquiry for any shipment that fails to reach its destination. We value your input as a customer and will collaborate with you to discuss the remaining alternatives, aiming to reach an agreement on the most favorable resolution.
