QC Purple Thai Strain Review: THC, Effects, Flowering Time & Yield

QC Purple Thai is an original QCS strain: a feminized, sativa-dominant cross of Chocolate Thai and Highland Oaxacan Gold with 20 to 24% THC and a long 10 to 14 week flowering time. This QC Purple Thai strain review covers our own specs, who this tall, patient plant is for, and what growers generally report about Thai-type sativas. It is a new release with no customer reviews yet.

QC Purple Thai strain at a glance

What is the QC Purple Thai strain?

QC Purple Thai is an original QCS strain: Quebec Cannabis Seeds is its original breeder, and these are our own genetics bred in Quebec.

QC Purple Thai is a feminized photoperiod sativa bred by Quebec Cannabis Seeds from Chocolate Thai and Highland Oaxacan Gold, two classic landrace-based lines. Our product page describes a fast-onset, euphoric and creative effect, a tall and stretchy plant like a Thai, and a long flowering period that rewards patience.

Chocolate Thai is an old-school sativa that growers and consumers commonly associate with a cocoa, coffee and spice character, and Oaxacan gold lines come from the mountains of southern Mexico, where long-season sativas were selected for their bright, energetic effects. Together they point to a plant that is closer to the old sativa tradition than to a modern high-yield hybrid. The page notes that this is a newer release, so its figures come from the breeder’s own grows rather than customer harvests. Other seed companies sell similarly named Thai strains with different genetics and numbers; what you read here is for the QCS version only.

Is QC Purple Thai indica or sativa?

QC Purple Thai is sativa dominant. QCS does not publish an exact percentage. Its structure is exactly what you would expect: tall and stretchy, like a Thai, with the page warning that it can triple in height if you flip it to 12/12 while small indoors. That is a sativa trait, and it is why a sativa-dominant plant needs a very different plan from a short, dense indica.

If you are curious about the opposite end of the spectrum, read our guide to what indica does to you.

Smell and flavour: berry, chocolate, coffee and spice

QCS lists the taste as berry, earthy, chocolate and coffee, with spice. That is a more complex palette than most modern fruit hybrids: expect a mix of dark, roasted sweetness and warm spice with berry brightness on top. Growers commonly report that Thai-type sativas show their best flavours after a slow, careful dry and a longer cure.

QC Purple Thai effects

The QCS page describes a fast-onset, euphoric and creative effect with long-lasting mental stimulation. That fits what consumers commonly say about Thai-type sativas: an energetic, mentally active high that is often described as better for daytime. Responses vary widely, and long-lasting stimulation is not for everyone, especially if you are sensitive to racy highs.

At 20 to 24% THC this is a moderately strong strain. If you are new, start low and wait before taking more.

How strong is QC Purple Thai? THC content

QCS lists QC Purple Thai at 20 to 24% THC; CBD is not listed. That is a strong, but not extreme, potency for a long-flowering sativa, and it sits below our seeds over 25% THC. THC always depends on genetics, light, nutrition, harvest timing and cure.

Growing QC Purple Thai: flowering time and yield

QC Purple Thai takes 10 to 14 weeks of flowering indoors, which is long. QCS describes yield as moderate to high indoors and high outdoors in suitable climates; the product page does not give gram figures, so we will not invent any. The plant carries a “mold tolerant” badge, which is not the same as mold proof.

The page is direct: this is not a beginner strain. It needs patience, a long flowering period and a warm season. Outdoors, it needs a warm climate, or a greenhouse in most of Quebec, because the harvest comes late in the season. Indoors, because it can triple in height if flipped while small, flip early and train the plant low (topping, low-stress training and a net), or give it a tall room. Growers commonly report that long-flowering Thai types are best harvested by trichomes rather than by the calendar, since they can keep developing for weeks.

What customers report

QC Purple Thai has no customer reviews yet. It is a newer release and we would rather say so than invent feedback. What the product page itself says is:

• Height: tall and stretchy, with the potential to triple in height after the flip if flipped small.
• Patience: a long flowering period of 10 to 14 weeks.
• Climate: a warm season, or a greenhouse in most of Quebec, is needed outdoors.
• Source of the numbers: the figures come from the breeder’s own grows, not from customers.

If you grow it, tell us how it went; we answer every email.

Is QC Purple Thai right for you?

Choose QC Purple Thai if you are an experienced, patient grower who wants a tall old-school sativa with chocolate, coffee and berry notes and a creative, energetic effect, and you have the height, warmth and time it needs. If you want something quicker or easier, look at our fast-version seeds or the autoflower range. For a sturdy, beginner-friendly option, see the feminized seeds and our review of Blue God.

QC Purple Thai: 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 QC Purple Thai seeds →