Quebec Blast Strain Review: THC, Effects, Flowering Time & Yield

Quebec Blast is an original QCS strain: a mostly indica, feminized variety at 24% THC that flowers in about 9 weeks and finishes outdoors in mid-October. This Quebec Blast strain review combines our own specs, the real customer reviews on our site and what growers generally report, so you can judge whether it fits your garden.

Quebec Blast strain at a glance

What is the Quebec Blast strain?

Quebec Blast 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.

Quebec Blast is one of the cannabis strains we breed ourselves in Quebec, and it was selected with a very practical goal: a plant that finishes properly in a short northern season. The product page describes a compact, leafy, indica-structured plant that is happy in a tent and that roots easily from cuttings. The QCS page does not list the parent strains, so we will not guess at them here; what matters is that this is our own line, not a repackaged cut from somewhere else.

On paper the Quebec Blast strain is simple: 24% THC, under 1% CBD, about 9 weeks of indoor flowering and an outdoor harvest in mid-October. In practice the real draw is the combination of a dense, resinous indica-style flower with a mould-tolerance badge, which matters in a damp autumn. The page lists related QCS strains such as Quebec Gold 2.0, Quebec Black Bud and Quebec Super Skunk, so if you already grow one of those you will recognise the family approach: reliable, productive, built for Canadian weather.

Is Quebec Blast indica or sativa?

Quebec Blast is listed as mostly indica. The page gives no exact percentage, so treat that as a description of the plant rather than a lab number. In the garden this shows up as a medium-height, compact and leafy plant with the broad-leaf structure people expect from indica-leaning genetics. One grower who ran it indoors described exactly that: compact, leafy, indica in the build.

Outdoors it is a different story. Growers report plants reaching 5 to 7 feet in the ground or in big pots, so do not let the word compact fool you. If you want to understand what an indica-leaning plant usually feels like before you commit, our guide to what indica does to you explains the typical differences from sativa-leaning plants.

Smell and flavour

QCS lists the taste as pine, spice, herbal and floral. The About text goes a little further: pine first, then spicy, peppery herbal notes and a sweet finish. Customers confirm the pine. One grower describes pine and spice terpenes, another says the plant smells piney and sweet, and a third found it very piney and a little harsh, noting that the sweetness other people mention was missing in his plant.

That last comment is useful. The product page itself says that some phenotypes lack the sweet finish, so if you are grown from seed expect a little variation from plant to plant. Consumers of pine-forward cannabis often associate the smell with the terpene pinene, but your own nose is the best test once the flowers are dried and cured.

Quebec Blast effects

The QCS description of the high is euphoric and clear-headed at first, then relaxing. Customers add detail from the garden: one calls it a good buzz, and another, who received the seeds as a gift, describes an indica buzz that does not cause sleepiness. Consumers of indica-leaning cannabis in general often report a calm body feeling, but effects vary from person to person and with the dose.

With 24% THC this is a strong strain, and the product page itself advises starting with small amounts. Start low, wait, and only then decide whether you want more. If you have a low tolerance, a small first session is the sensible choice.

How strong is Quebec Blast? THC content

QCS lists Quebec Blast at 24% THC and under 1% CBD. In everyday terms that puts it in the strong category, well above the mild, single-digit varieties but a step under our very strongest strains. THC is influenced by genetics, light, nutrition, harvest timing and how carefully the flowers are dried and cured, so a 24% figure is a ceiling for good conditions rather than a promise.

If you are comparing options, our cannabis seeds over 25% THC page lists the next step up. Note also that other seed companies may use similar names for different crosses, so figures you see elsewhere may differ; the numbers on this page are for the QCS version.

Growing Quebec Blast: flowering time and yield

Indoors, Quebec Blast flowers in about 9 weeks and yields 300 g/m² or more. Outdoors it is ready in mid-October and QCS lists up to 500 g per plant. A Quebec Blast grower in our reviews got roughly half a pound from a single plant in a 15 to 20 gallon pot, which lines up well with that figure.

Growing tips drawn from the page and from customer reviews: first, give it room. One grower ran a freebie seed in an 8-gallon pot, reached 5 feet untopped and recommended a bigger pot and more feed next time. Second, stake or net outdoor plants, since wind damaged branches in one outdoor garden. Third, because the plant is bushy and leafy, trim carefully and keep air moving through the canopy. The mould-tolerant badge helps, but no strain is immune, so watch humidity in the last weeks. Fourth, the plant is reported to clone easily, which makes it handy if you want to keep a mother. For a gentler start, see our feminized seeds collection.

What customers report

Quebec Blast is rated 4.9 out of 5 on our site, with 18 reviews listed. Ten of them are shown on the page and this summary is based on those.

• Resists mildew and rot: an outdoor grower reached about 7 feet and roughly half a pound per plant in a big pot, said it resisted mildew and rot, and would grow it again (4 out of 5).
• Variation between plants: a repeat customer ran several plants and enjoyed the differences: one short and topped with bright red, golf-ball buds, another taller with large dark buds.
• Dense, resinous flowers: a grower of a freebie seed reported dense, crystal-rich buds and a piney, sweet smell.
• One honest complaint: a French-speaking grower found it very piney and a bit harsh, missing the sweetness others describe, though he still liked the buzz and the indoor yield.
• Tough in heat: another grower said it was the only plant to survive a hot summer in the tent.
• Reliable genetics: a returning customer thanked us for dependable genetics after bad experiences with other sellers.

Is Quebec Blast right for you?

Quebec Blast suits growers who want a strong, mostly indica plant with a mould-tolerance badge and a reasonably early finish for northern gardens. It asks for room and support outdoors, and it is not the one to pick if you want a candy-sweet profile every time. If you like it, compare with our reviews of Blue God and Black Cherry OG, or browse the full feminized seeds range.

Quebec Blast: frequently asked questions

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 Quebec Blast seeds →