Blueberry Strain Review: THC, Effects, Flowering Time & Yield

Blueberry is an original QCS strain: a 75% indica, 25% sativa feminized hybrid (Afghani × Thai × Purple Thai) with 24% THC, 50 to 60 days of flowering and an early to mid-October outdoor harvest. This Blueberry strain review brings together our own specs, the real customer reviews and what growers and consumers commonly report about this famous berry-scented line, so you can decide if it fits your garden.

Blueberry strain at a glance

What is the Blueberry strain?

Blueberry is an original QCS strain: Quebec Cannabis Seeds is its original breeder, and this is our own version of the classic berry line, bred in Quebec since 2015 by a grower with more than 35 years of experience.

The Blueberry strain is one of the best-loved names in cannabis, and the reason is simple: it smells and tastes like berries. The line goes back to the 1970s, when Afghani, Thai and Purple Thai genetics were combined into a purple, fruit-scented plant that growers have been passing around ever since. It later became a parent to many famous crosses, so even if you have never grown it, you have probably smoked something from its family.

The QCS version is listed as Afghani × Thai × Purple Thai, a 75% indica hybrid with 24% THC and heavy resin. We offer it as a feminized photoperiod seed, plus a faster-finishing version, Blueberry Fast Version. If you like heavier indica, Blue God comes from the same parent family.

Many seed companies sell a Blueberry, and the plants, flowering times and potency vary between them. Other seed companies' versions may differ; the numbers on this page are for the QCS version only.

Is Blueberry indica or sativa?

QCS lists Blueberry as 75% indica and 25% sativa, which makes it an indica-dominant hybrid. The Afghani side gives resin and a calming effect, while the Thai side brings a sweet, fruity top note and a little lift at the start.

Not everyone agrees on how it grows. One of our customers got a tall, sativa-like plant and argued that a Thai-derived cross should not be called indica dominant, and our product page accepts that seeds vary and that the Thai heritage can show up as a taller phenotype. In other words, expect an indica-leaning plant, but do not be shocked by a stretchy one. For a plain-language look at the indica experience, read our guide to what indica does to you.

Smell and flavour

QCS lists the taste as berry, earthy, herbal and spice, and reviewers add a little skunk. The berry note is what people come for: sweet and jammy on the inhale, with an earthy, spicy base. One grower described a strong blueberry-and-spice aroma, and another said the smell was strong in flower.

Colour is part of the show. Cooler nights late in flowering tend to bring out purple tones and more aroma, which is a well-known trick with purple-prone plants. If you grow in a warm room, do not expect the same colours you see in photos.

Blueberry effects

QCS describes the Blueberry effect as a start of mental clarity and euphoria that then relaxes and soothes the body, and calls it a good evening strain. Consumers often describe classic Blueberry as happy and mellow rather than overwhelming, though effects always vary by person and dose.

With 24% THC, it is a strong strain by everyday standards. If you are new, start low and wait before taking more. Nothing here is medical advice.

How strong is Blueberry? THC content

QCS lists Blueberry at 24% THC. CBD is not listed. That is firmly in the strong category, but it leaves room above it. If you want more punch, browse our THC over 25% seeds.

Potency depends on how the plant is grown and cured. Online you will see Blueberry listed at lower or higher numbers depending on the company and the phenotype; the figure here is for the QCS version only.

Growing Blueberry: flowering time and yield

This is a quick photoperiod plant. Indoors it flowers in 50 to 60 days, which QCS calls fast for a photoperiod strain, and yields up to 500 g/m². Outdoors, plants are moderate in height and are harvested in early to mid-October, giving up to 300 g per plant. It is labelled beginner-friendly, and reviewers report minimal issues.

It grows well in soil and in hydro. A reviewer who grew it in a deep water culture system harvested 100 g of heavily frosted purple and green buds from a single plant and took clones that all rooted. Another started the plant directly on 12/12 light in a 5-gallon fabric pot. A public outdoor grow diary recorded good resilience to gale-force winds and a three-day rainstorm. Those are individual results, not averages.

Tips: top and manifold the plant for a short, even canopy (one reviewer did this to good effect), feed generously because it is a heavy feeder, and watch your temperature late in flower if you want colour. Remember that "mold resistant" on our site means mold tolerant, so keep airflow up around dense flowers.

What customers report

Our page states 19 reviews with an average of 4.8 out of 5, and ten reviews are shown on the page. Here is what they say, including the honest comments.

• Looks and aroma: a grower called it an attractive phenotype with a strong blueberry-and-spice smell. A vigorous, heavy feeder, he topped and manifolded it for a short, even canopy.
• Easy in hydro: another grower germinated by paper towel, grew in DWC and harvested 100 g of heavily frosted purple and green buds, with all clones rooting. He called it easy to grow.
• Resin and flavour: a grower under a 1000 W HPS lamp found it thick, resinous and flavourful at week seven. A French-speaking grower compared the finished quality to finger hash, with about 90 g dry after three weeks of low-stress training.
• Variety between seeds: the same grower noted that five seeds gave five different tastes and growth patterns.
• The honest comment: one grower got a tall, sativa-like plant and disputed the 75% indica label, but still liked how it grows.
• Service: several reviewers praised the fast delivery to the USA, easy germination and the free seeds included with orders.

Is Blueberry right for you?

Choose Blueberry if you want an easy, quick-finishing, berry-scented plant with 24% THC and a relaxing evening effect. It is a classic first choice for newer growers and a reliable one for experienced growers who want clones and a dependable flower. If you want a very tall sativa or a very small plant, look elsewhere.

Explore more: our feminized seeds range, our fast version collection if you want an even faster finish, and our review of Blue God, another heavy indica from QCS.

Blueberry: 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 Blueberry seeds →