Français Emperor Jack is an original QCS strain: a compact, mostly sativa autoflower bred from Jack Herer and Northern Lights, listed at 20% THC and 8 to 10 weeks of flowering. This Emperor Jack strain review covers our specs and what growers and consumers commonly report about its parents, since the listing has no customer reviews yet.
Emperor Jack strain at a glance
| Genetics | Jack Herer × Northern Lights |
| Type | Autoflower, feminized, mostly sativa |
| THC | 20% |
| Flowering time | 8 to 10 weeks indoors |
| Yield | 250 to 450 g/m² indoors, 150 to 250 g per plant outdoors |
| Flavour | Earthy, spice, citrus, floral |
| Growing level | Beginner-friendly, compact |
| Pack | 5 feminized autoflowering seeds (10 and 20 also available) |
| Breeder | Quebec Cannabis Seeds (original QCS genetics) |
What is the Emperor Jack strain?
Emperor Jack is an original QCS strain: Quebec Cannabis Seeds is its original breeder, and these are our own genetics bred in Quebec.
Emperor Jack Autoflower is QCS’s sativa-leaning answer for growers who love the Jack Herer family but would like it on a faster, simpler schedule. We bred it from Jack Herer and Northern Lights, in an autoflowering, feminized plant that stays compact. No light change, no sexing, and a flowering window of 8 to 10 weeks.
Jack Herer is a famous sativa-dominant line with a pine-and-spice reputation, while Northern Lights is a classic indica known for resin and calm. The name suggests a Jack that rules the roost, and the product page confirms a mostly sativa cut with an uplifting character. Several seed companies sell Jack-based crosses under similar names, so remember that the numbers on this page are for the QCS version only.
Is Emperor Jack indica or sativa?
QCS describes Emperor Jack as mostly sativa and does not give an exact percentage, so we will not invent one. With Jack Herer as the sativa-leaning side and Northern Lights as the indica anchor, this makes sense: a Jack-forward plant with a touch of Northern Lights structure and resin.
In an autoflower, a sativa lean usually shows up as a slightly taller, airier plant than a squat indica auto, though it stays compact overall. If you want to compare with the other side of the family, read what indica does to you.
Smell and flavour: earthy, spicy, citrus and floral
QCS lists the taste as earthy, spice, citrus and floral, and the product page describes an earthy, spicy flavour with citrus notes. That reads like classic Jack Herer: a dry, peppery base with a bright citrus top. The Northern Lights side tends to add a softer earthy depth.
Growers commonly report that Jack-type plants smell strongly in the last weeks, with a sharp, piney edge. A slow dry and a few weeks of curing help keep the citrus and floral notes from fading.
Emperor Jack effects
The QCS description calls the effect uplifting and euphoric. That fits the sativa lean and the Jack Herer reputation: consumers commonly describe Jack-style flower as clear, bright and energetic, the kind of high that many people enjoy in the daytime or for creative, sociable moments. The Northern Lights half may soften the edges a little.
Effects always depend on dose, tolerance and setting. Racy or restless feelings are sometimes reported with sativa-leaning flower in general, and dry mouth and dry eyes are common. If you are new, start low and go slow.
How strong is Emperor Jack? THC content
QCS lists Emperor Jack at 20% THC, a moderate-to-solid level. That is a comfortable strength for many adults and well below the extremes in our THC over 25% seeds category. The product page does not list a CBD figure.
The real number in your jar depends on genetics, light, feeding, drying and curing, so treat 20% as a guide.
Growing Emperor Jack: flowering time and yield
Emperor Jack flowers automatically, with no change in light hours. Indoors expect 8 to 10 weeks of flowering and a yield of 250 to 450 g/m². Outdoors QCS lists 150 to 250 g per plant. No fixed outdoor harvest date is given, so time your sowing for your local frost date and use a sunny spot.
Growing tips
QCS advises sowing directly into the final pot, keeping conditions steady and harvesting by checking the trichomes rather than the calendar. That is good advice for any autoflower. A sativa-leaning plant may stretch a little, so give it some headroom and use gentle low-stress training instead of topping.
Go easy on nutrients in the first weeks and watch humidity late in flowering. New to autos? Our autoflower seeds guide covers the basics. The listing notes that its information comes from the breeder’s description rather than from customer grows.
What customers report
Emperor Jack has no customer reviews on our site yet, and we will not invent any. When growers post their results we will add what they say, including any complaints.
- What we can say now: the QCS listing calls it easy to grow, compact and beginner-friendly.
- What to watch: the specs come from the breeder’s description, so treat the yield range as a guide until more grow reports arrive.
- Guarantee: germination is guaranteed at 80% with replacements.
Is Emperor Jack right for you?
Choose Emperor Jack if you want a bright, spicy-citrus autoflower with an uplifting character, a moderate 20% THC and a short, simple grow. If you prefer a calmer, more indica-leaning effect, look at our feminized seeds or the Fat Bastard review for something much stronger.
Why grow Emperor Jack from Quebec Cannabis Seeds?
- Bred in Quebec by the original breeder. Quebec Cannabis Seeds (QCS) is the original breeder of Emperor Jack, one of our own QCS Originals, bred here since 2015 by a grower with 35+ years of experience.
- Guaranteed. 80% germination guarantee with replacements, and delivery guaranteed. If a pack under-performs, email us and we make it right.
- Free seeds with every order, and free shipping on orders over $200.
- Fast, discreet shipping. Ships from Quebec within 24 hours Monday to Friday in plain, unbranded packaging, to Canada (Canada Post) and to the USA (1–2 business days by Express).
- Real support. Every email answered within 24 hours.
Buy Emperor Jack seeds → Canada delivery Shipping to the USA
Emperor Jack: frequently asked questions
What is the Emperor Jack strain?
Emperor Jack Autoflower is a QCS original: a feminized, mostly sativa autoflower bred from Jack Herer and Northern Lights, with 20% THC and an earthy, spicy, citrus flavour.
Is Emperor Jack indica or sativa?
It is mostly sativa. QCS does not give an exact percentage on the product page. The effect is described as uplifting and euphoric.
How strong is Emperor Jack?
QCS lists it at 20% THC, a moderate-to-solid level. Effects vary by person, so start low and go slow.
How long does Emperor Jack take to flower?
About 8 to 10 weeks of flowering indoors. These are ranges, not promises.
How much does Emperor Jack yield?
250 to 450 g/m² indoors and 150 to 250 g per plant outdoors. Real results depend on your light, pot size and method.
Is Emperor Jack easy to grow?
Yes. QCS calls it easy to grow and beginner-friendly. Sow directly into the final pot, keep conditions steady and harvest by checking the trichomes.
What does Emperor Jack taste and smell like?
Earthy and spicy with citrus and floral notes.
Where can I buy Emperor Jack seeds in Canada and the USA?
Emperor Jack seeds are sold at Quebec Cannabis Seeds in packs of 5, 10 and 20, shipped from Quebec across Canada and to the USA. Germination (80% guarantee, with replacements) and delivery are guaranteed.
A note on the numbers in this article: harvest dates, flowering times and yields are ranges, not promises. They vary depending on growing conditions: the grower, the method and the season's weather. No strain is 100% mold resistant. How we set these numbers →
About this article
Published by the Quebec Cannabis Seeds team. QCS was founded in 2015 by Trent LaPierre, a Quebec breeder with more than 35 years of hands-on growing experience. Genetics we bred ourselves are described from our own breeding work; when a strain comes from another breeder, we say so and credit them. How we work. Last updated: November 6, 2026.
Sources and further reading: Cannabis Act (Justice Laws, Government of Canada) · Cannabis Regulations (SOR/2018-144). Rules on cannabis seeds differ by province and state; check your local regulations before ordering.
