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Big Jack Cannabis Seeds Feminized
$50.00
5 Seeds Per Pack
Strain at a Glance
A fast, mostly indica hybrid with 19 to 21% THC, very heavy yields and a sweet lemon aroma. Original QCS genetics, bred by Quebec Cannabis Seeds in Quebec, Canada. See the grow diary on GrowDiaries.
Genetic Balance
Key Information
- THC19–21%
- TasteCitrus • Herbal
- Indoor flowering time55–60 days
- Outdoor harvest timeMid to late September
Specifications
| Strain | Big Jack |
|---|---|
| Seed type | Feminized |
| Genetic balance | Mostly indica |
| THC | 19–21% |
| Taste | Citrus, Herbal |
| Indoor flowering time | 55–60 days |
| Outdoor harvest time | Mid to late September |
| Yield | Up to 800 g/m² indoors, up to 700 g per plant outdoors |
| Pack size | 5 Seeds Per Pack |
These figures are ranges, not promises. Flowering time, harvest date and yield vary depending on growing conditions: the grower, the method and the season's weather. "Mold resistant" means mold tolerant: less prone to mold and slower to be affected. No strain is 100% mold resistant. How we set these numbers →
Taste & Aroma Profile
A sweet, citrusy fragrance dominated by lemon, which gets stronger as the buds are broken apart, with a mild, herbal background — a quiet plant in the grow, as one reviewer noted, which matters for a tent in the house.
About Big Jack
Genetics & strain profile
Big Jack is one of our QCS Originals, a mostly indica hybrid with 19 to 21% THC that we selected from indica-dominant genetics for a balance of strength, flavour and ease of growing — and above all for yield and speed, which is why it sits in our Featured Strains with a September harvest badge. Seven reviews average 4.3 out of 5. Growers call it an “excellent clone strain” that is “quick to veg”, say it “grows like a weed” with big topped colas and a discreet smell — one scored it “yield 10/10, looks 7/10, buzz 7/10”, which is a fair summary — and one Quebec grower reported a “very impressive harvest”. An Ontario grower running it beside our Quebec Blast noted it flowered about a week earlier with fluffier buds and no mildew or bud rot on either. The honest two-star review is from a grower whose 8-foot plant gave barely two ounces; height without light or feeding gives leaves, not buds, so give it full sun and food.
How Big Jack grows
Indoors Big Jack flowers in 55 to 60 days, which is relatively fast, with up to 800 g/m² with proper care — one of the biggest indoor figures in our catalogue. It roots easily from cuttings and vegs quickly, so it is a natural choice for a perpetual harvest or a sea of green; top it once and net it to even out the heavy colas. The buds are somewhat fluffy rather than rock-hard, which helps them dry evenly and resist rot. Outdoors the plants can grow to 200 to 250 cm — 8 feet for one reviewer — and give up to 700 g each depending on conditions. Aim to harvest in mid to late September, which suits Canada and other northern climates; one Ontario grower expected his to run into mid-October in a cool year. A hungry plant: feed it well and give it full sun, or the yield will disappoint.
Taste, aroma and effect
A sweet, citrusy fragrance dominated by lemon, which gets stronger as the buds are broken apart, with a mild, herbal background — a quiet plant in the grow, as one reviewer noted, which matters for a tent in the house. The high is strong but balanced: clear in the head at first, then relaxing in the body, which makes it an afternoon-into-evening strain. At 19 to 21% THC it is moderate and manageable for newer users. For other fast, heavy-yielding strains bred here, see Crush Kush and Quebec Blast; for a lemon-forward strain with more lift, Lemon OG Kush.
Frequently Asked Questions
How long does Big Jack take to flower?
55 to 60 days indoors. Outdoors it is typically ready in mid to late September.
How much does Big Jack yield?
Up to 800 g/m² indoors with proper care and up to 700 g per plant outdoors. Full sun and feeding make the difference.
How strong is Big Jack?
19 to 21% THC. Strong but balanced: clear first, then relaxing.
Is Big Jack indica or sativa?
Mostly indica, selected from indica-dominant genetics.
Is Big Jack easy to grow?
Yes. It clones easily, vegs fast, grows like a weed and showed no mildew or rot for reviewers.
How tall does Big Jack get?
200 to 250 cm outdoors — 8 feet for one reviewer.
Does Big Jack smell strong in the grow?
No. Reviewers call it discreet; the cured buds smell of sweet lemon.
Who bred Big Jack?
Quebec Cannabis Seeds — it is one of our QCS Originals. The exact parents are not published.
Where can I buy Big Jack seeds in Canada?
Right here at Quebec Cannabis Seeds. Orders ship from Quebec within 24 hours on business days, in plain packaging, across Canada and to the USA, with a germination guarantee.
Order with confidence
- Germination guarantee. If fewer than 80% of your seeds germinate, we send replacement seeds.
- Delivery guarantee. We guarantee delivery of your order.
- Discreet packaging. Plain, unbranded packaging with no logos and no mention of the contents. No signature is required.
- Shipped from Quebec within 24 hours. Orders usually ship the same day or within 24 hours of payment, Monday to Friday. Canada: 3 to 7 days, or 2 to 3 days by Express. USA: 1 to 2 business days by Express. Free shipping on orders over $200.
- Your privacy. We do not sell or share your information with third parties.
- Free seeds with every order, and real people to help: 514-805-2741, Monday to Friday, 11 AM to 6 PM EST.
Details: Shipping · Return policy · FAQs · Privacy policy
- Availability: In Stock
- Model: Q.C.S.
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Manufacturer:
14/10/2025
Excellent clone strain. Quite quick to veg too!
27/09/2025
First time growing it but so far so good. I found it was about a week to show flowering than the Quebec blast. No issues yet with mildew or bud rot on either big Jack or Quebec blast. Buds seem a bit more fluffy than Quebec blast. I’m guessing to more weeks for blast and 3 for big Jack so mid October to end weather permitting
17/10/2023
Looking good..lots of weed...quick to harvest..very nice..
02/04/2023
Very good customer service had an issue with my germination which was my own fault they don't recommend the paper towel method, I had Oneonta of my 5 that did pop is coming along nice but not as quick as my 1 M39. looking for a solid outdoor for northern Ontario. They also told me I would be getting new seeds, very kind. Thank you QCS! You are my go to from here on out.
02/11/2022
Viens juste de récolter... récolte très impressionnante , vraiment pas déçu, très belle plante
06/10/2022
pas trop impress pour cette plante ! eux misere a sortir 2 oz . sa pousser monter a 8 pied de haut but sa rien faite de beau !
Désolé que cette culture n'ait pas donné le résultat espéré. Chaque paquet est couvert par notre garantie : la livraison est garantie, la germination est garantie à 80 %, et si vos graines n'ont pas levé ou si le mauvais paquet est arrivé, nous réexpédions un remplacement — sans discussion, il suffit de nous contacter. Nos guides de germination et de culture couvrent les causes les plus fréquentes d'une culture décevante : https://quebeccannabisseeds.com/conseils-essentiels-pour-la-germination-des-graines
— QCS Seeds
03/06/2022
big jack pousse comme de la mauvaise herbe
facile a cultivé la hauteur sera a vérifier en intérieur
pousse super bien aussi topé
des gros cola
au niveau des odeurs il est très discret
gros rendement 10/10
beauté 7/10
buzz 7/10