Français Critical x Northern Lights is an original QCS autoflower: a feminized, mostly indica cross with 19 to 23% THC, about 70 days from seed to harvest and up to 450 g/m² indoors. This Critical x Northern Lights strain review covers its flavour, effects, growing needs and what customers report, using QCS product data and what growers commonly say about similar crosses.
Critical x Northern Lights strain at a glance
| Genetics | Critical × Northern Light Auto |
| Type | Autoflower, feminized, mostly indica |
| THC | 19 to 23% |
| Seed to harvest | About 70 days |
| Yield | Up to 450 g/m² indoors |
| Flavour | Earthy, pine, citrus, floral |
| Growing level | Beginner-friendly, compact, balcony-friendly |
| Pack | 5 feminized autoflowering seeds (10 and 20 also available) |
| Breeder | Quebec Cannabis Seeds (original QCS genetics) |
What is the Critical x Northern Lights strain?
Critical x Northern Lights is an original QCS strain: Quebec Cannabis Seeds is its original breeder, and these are our own genetics, bred in Quebec since 2015 by a grower with more than 35 years of experience.
Critical x Northern Lights is a feminized autoflower from Quebec Cannabis Seeds, crossing Critical with Northern Light Auto. It is a compact, mostly indica plant with 19 to 23% THC, a seed-to-harvest time of about 70 days and a yield of up to 450 g/m² indoors.
The Critical x Northern Lights strain is meant to combine Critical’s fast flowering, sturdy growth and heavy yield with the relaxing effect and resilience of Northern Lights. Carrying the autoflower trait, it does not depend on a light-hours change, so you can sow it any time conditions allow.
Some context: Northern Lights is one of the most widely grown indica-leaning lines in the world and is generally described as having Afghan roots, while Critical is the name of a family of fast, heavy-yielding plants. Many seed companies sell their own crosses under these names, so other seed companies’ versions may differ. The numbers in this review are for the QCS version.
Is Critical x Northern Lights indica or sativa?
QCS lists it as mostly indica, without a precise percentage. That fits both parents: Northern Lights is a classic indica-leaning plant, and Critical is commonly described as indica-dominant too. Expect a short, sturdy, branchy plant, which is why QCS highlights it as compact and balcony-friendly.
If you want a plain explanation of what that indica side tends to feel like, see what indica does to you.
Smell and flavour: earth, pine, citrus and flowers
QCS lists the taste as earthy, pine, citrus and floral. That is a more complex mix than the usual sweet dessert profile: a woodsy, resinous base from the Northern Lights side, brightened by citrus and a soft floral finish.
Pine and earth tones in cannabis are commonly linked with terpenes such as pinene and myrcene, and citrus tones with limonene, though every plant differs. A slow dry and a proper jar cure will do more for the final flavour than almost anything you add during the grow.
Critical x Northern Lights effects
The product page describes the effect as physically relaxing with a touch of uplifting euphoria, and advises newer consumers to start with a small amount. That matches the common reputation of Northern Lights-type plants, which people usually describe as calming and body-heavy, with a gentle mood lift at the start.
Effects vary from person to person and depend on dose, tolerance and setting. Dry mouth and dry eyes are the side effects most often mentioned for cannabis in general. Many consumers keep indica-leaning strains for the evening, and that is a reasonable approach here.
How strong is Critical x Northern Lights? THC content
QCS lists 19 to 23% THC. The CBD level is not listed on the product page. That range is solid rather than extreme, and it is a sensible choice for people who want something relaxing without chasing the highest numbers.
As always, the final potency depends on how the plant is grown, harvested, dried and cured. If you prefer a stronger option, browse our seeds over 25% THC.
Growing Critical x Northern Lights: flowering time and yield
The plant takes about 70 days from seed to harvest and does not need a change in light hours. QCS lists a yield of up to 450 g/m² indoors. No outdoor figure is given, so we will not quote one.
The chart below shows the seed-to-harvest time and the indoor yield as listed on the product page. They are ranges that depend on your conditions, not guarantees.
Practical growing tips
QCS recommends sowing straight into the final pot, keeping the medium damp but not soaked at around 22 to 25 °C, and harvesting by checking the trichomes rather than counting days. That advice is standard for autoflowers because they dislike transplant stress and have no spare time to recover from it.
Gentle low-stress training helps spread the branches, while topping and heavy defoliation are best avoided. Northern Lights relatives can build resinous, dense flowers, so keep air moving in the last weeks; remember that “mold resistant” on our pages means mold tolerant. Outdoors in Canada, a roughly 70-day plant can go out after the last frost and still finish before autumn. See our autoflower seeds guide for the whole routine.
What customers report
Critical x Northern Lights has two customer reviews on our site, both five stars, so the average is 5 out of 5. With only two reviews, treat this as a first impression rather than a trend.
- Free-seed grower: one customer received two free seeds with an order, said they were extremely satisfied and described a solid, very frosty flower. They recommended it.
- Germination and vigour: another grower reported that every seed germinated, growth was fast and the first leaves looked normal, and said they would keep following the plant through flowering.
Neither review mentions a problem, but neither is a full grow report with weights or flowering notes either. We will add more as customers share them.
Is Critical x Northern Lights right for you?
Critical x Northern Lights is a good match if you want a compact, easy autoflower with a pine-and-citrus flavour, 19 to 23% THC and a relaxing evening effect. QCS flags it as beginner-friendly and balcony-friendly, which is a good reason to put it on a short list for a first grow or a small space.
If you need the highest THC or very large plants, look elsewhere. Browse our autoflower seeds for alternatives, or read our review of Blue God for a high-THC indica-leaning profile.
Why grow Critical x Northern Lights from Quebec Cannabis Seeds?
- Bred in Quebec by the original breeder. Quebec Cannabis Seeds (QCS) is the original breeder of Critical x Northern Lights, 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 Critical x Northern Lights seeds → Canada delivery Shipping to the USA
Critical x Northern Lights: frequently asked questions
What is the Critical x Northern Lights strain?
It is an original QCS autoflower, a feminized Critical × Northern Light Auto cross. It is mostly indica, with 19 to 23% THC and an earthy, pine, citrus and floral flavour.
Is Critical x Northern Lights indica or sativa?
QCS lists it as mostly indica. No exact percentage is given.
How strong is Critical x Northern Lights?
QCS lists 19 to 23% THC. Results vary with how the plant is grown, dried and cured, so start with a small amount if you are new.
How long does Critical x Northern Lights take to flower?
About 70 days from seed to harvest. As an autoflower it needs no change in light hours.
How much does Critical x Northern Lights yield?
QCS lists up to 450 g per square metre indoors. No outdoor figure is given. These are ranges, not guarantees.
Is Critical x Northern Lights easy to grow?
QCS describes it as easy for novices and experienced growers alike, with beginner-friendly and balcony-friendly badges on a compact plant.
What does Critical x Northern Lights taste and smell like?
QCS lists earthy, pine, citrus and floral flavours.
Where can I buy Critical x Northern Lights seeds in Canada and the USA?
Critical x Northern Lights autoflower feminized seeds are sold by Quebec Cannabis Seeds in packs of 5, 10 and 20. Canada delivery takes 3 to 7 days (2 to 3 with Express) and USA orders ship Express in 1 to 2 business days. Shipping is free over $200, with an 80% germination guarantee and free seeds with every order.
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 →
View Critical x Northern Lights seeds →
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.
