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

Chemdawg is an original QCS strain: a balanced to slightly sativa-dominant feminized hybrid with 20% THC, about 9 to 10 weeks of flowering and a mid-October outdoor harvest. This Chemdawg strain review combines our own specs, the real customer reviews and what growers commonly report about this legendary diesel-and-skunk plant, so you can decide whether it deserves a spot in your garden.

Chemdawg strain at a glance

What is the Chemdawg strain?

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

The Chemdawg strain is one of the most influential names in cannabis, and arguably the grandparent of the whole "gas" family. Our product page says it is believed to be a parent of OG Kush and Sour Diesel, and many modern fuel-scented strains trace back to it. The story told most often is that its seeds came from a bag at a Grateful Dead show in 1991, and that growers kept and shared the best plants afterwards. Like most cannabis folklore, the details vary depending on who is telling it, so treat the origin story as a good tale rather than a documented fact.

The genetics are uncertain. Our page lists it as believed to be a Thai × Nepalese sativa cross, and that is how we describe it here. What we can say for sure is what the QCS version does: it grows into a vigorous, bushy plant, smells like fuel, and flowers on a longer schedule than our fastest strains.

You will also find many cuts, spellings and re-creations of Chemdawg (Chemdog, Chem Dawg, Chemdawg 91 and others), each with its own breeding and numbers. Other seed companies' versions may differ; the figures on this page are for the QCS version only.

Is Chemdawg indica or sativa?

QCS lists Chemdawg as balanced to slightly sativa-dominant, without publishing exact percentages. That is consistent with what the plant does in the garden: medium to tall, bushy and with strong side branching, with a longer flowering time than a typical indica and a head-first beginning to the effect.

If you are comparing it with a sedating indica, expect something different: Chemdawg is usually described by consumers as a more mentally active strain with body relaxation arriving later. For a contrast, our guide to what indica does to you explains what a classic indica tends to feel like.

Smell and flavour

Chemdawg does not whisper. QCS lists the taste and aroma as skunk, diesel, earthy and pine, and describes a pungent, fuel-like smell with a sharp diesel exhale. One reviewer called it an "insane smell". Many consumers who love gas strains say Chemdawg is where it all began, and the profile here fits that reputation.

The practical advice from our product page is worth repeating: use carbon filtration indoors and keep some distance from neighbours outdoors, because the smell in flower is strong.

Chemdawg effects

QCS describes the effects as cerebral stimulation first, then steady physical relaxation. The page says it is strong enough for experienced users without being extreme. Consumers often describe diesel-style strains as energetic and talkative at first, then calmer in the body, though effects always vary with the person, the dose and the way the plant was dried and cured.

As always, start low and go slow, particularly if you are new to sativa-leaning strains, which can feel racy in some people. Nothing here is medical advice.

How strong is Chemdawg? THC content

QCS lists Chemdawg at 20% THC. CBD is not listed on the product page. That is a moderate-to-strong number: enough for most experienced consumers, and a good deal gentler than the very high-THC strains in our catalogue. If you want more power, browse our THC over 25% seeds.

You may see higher figures for other companies' Chemdawg cuts online. Those numbers describe their versions, not ours. Final potency also depends on how you grow, dry and cure the plant.

Growing Chemdawg: flowering time and yield

Indoors, expect about 9 to 10 weeks of flowering and a yield of about 500 to 800 g/m² in good conditions. Outdoors, Chemdawg finishes in mid-October, so it suits regions where that is a safe harvest date, such as southern Quebec, Ontario and the Maritimes in a normal year. QCS did not publish a per-plant outdoor weight for this strain, so we will not quote one. The plant is medium to tall and bushy, and our page calls it vigorous and forgiving, with a beginner-friendly badge.

Outdoor growing is where reviewers say Chemdawg shines. One calls it a very good outdoor plant and says outdoors is the best way to grow it; another calls the plant a beast. The strong side branching means you can top it early and train the branches wide, which builds a bigger, more even canopy. Support heavy branches late in flower, and thin the inside of the plant for airflow, because the buds can be dense.

Indoors, the main factors are headroom and the smell. A medium-to-tall sativa-leaning plant needs room to stretch, so use training techniques such as topping and low-stress training to keep it under your lights, and use a carbon filter. Our page notes that no mold rating has been given for this strain, so keep humidity under control in the final weeks.

What customers report

Chemdawg has three reviews on our site, each rated four out of five, so the average is 4 out of 5. It is a small sample, so here is what they say without stretching it.

• Smell: one grower praised the "insane smell", called it a nice plant and a very good outdoor plant, and said outdoor is the best way to grow it.
• Size: another customer called the plant a beast, thanked us for the seeds and the customer service and asked to be told if more seeds become available.
• Indoor tips wanted: a third reviewer asked for indoor growing tips rather than rating the plant, which is a fair reminder that this strain is better known outdoors.

Our product page also links to a public grow diary from a Canadian garden if you want to follow a plant through the season.

Is Chemdawg right for you?

Choose Chemdawg if you want a classic diesel-and-skunk plant, you have room for a medium-to-tall bushy plant, and you grow outdoors in a region where mid-October is a safe harvest date. It is a good choice for people who love gas flavours and a head-first, then relaxing effect at moderate potency. It is a weaker choice for tight indoor spaces, discreet growers or anyone who wants a quick finish.

Want something quicker or stronger? Browse our fast version seeds or our THC over 25% collection, or read our review of Fat Bastard.

Chemdawg: 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 Chemdawg seeds →