Chemdog 4

Chemdog #4 Feminized Seeds by Blimburn Seeds

Chemdog #4 is a feminized cannabis seed from Blimburn Seeds that crosses the legendary Chemdawg genetics with Green Crack, producing a slightly indica-dominant hybrid built for generous yields and that unmistakable fuel-forward aroma. Discovered through one of the most storied origin tales in cannabis — a Grateful Dead concert in Deer Creek, Indiana, 1991 — the Chem line has shaped modern cannabis breeding like few other genetics. Now you can grow it yourself with a pack of three feminized seeds.

Why Grow Chemdog #4 Seeds?

The Chem genetic line is responsible for some of the most recognisable strains in modern cannabis. Greg Krzanowski scored some exceptional flower before a Grateful Dead show at Deer Creek, Indiana in 1991, then received an extra shipment of seeds at his home. From that batch came Chemdawg 91, Chemdawg D, Chemdawg 4, and the other original Chem strains that went on to parent countless hybrids. Blimburn Seeds' genetics team crossed Chemdawg with Green Crack to create this feminized Chemdog #4 — a cultivar that keeps the gassy Chem character but adds vigour, speed, and a forgiving growth habit.

What makes this one worth your tent space? Three things. First, the genetics are proven — Chemdawg parentage means dense, trichome-coated buds with that sharp fuel-and-chemical nose that Chem heads chase. Second, the Green Crack cross brings structure and resilience. Plants stay compact (up to 150 cm), which means no wrestling with an unruly sativa in a 120x120 tent. Third, the yields are genuinely impressive for a strain this manageable: up to 500 g/m² indoors and up to 700 g per plant outdoors.

One honest note: the 7–9 week flowering window is a range, not a guarantee. Phenotype variation means some plants will finish closer to 9 weeks. If you're used to strains that snap to attention at day 56, give Chemdog #4 a few extra days and watch the trichomes rather than the calendar. A jeweller's loupe or pocket microscope is your best friend here.

Growing Chemdog #4: What to Expect

Chemdog #4 feminized seeds produce photoperiod plants that respond well to both indoor and outdoor cultivation. The slightly indica-dominant genetics keep the structure tight — expect a sturdy central cola with well-spaced lateral branches that respond brilliantly to low-stress training (LST) or a simple ScrOG net. At a maximum height of around 150 cm, this strain fits comfortably in most grow tents without needing aggressive topping to control stretch.

Indoors, flip to 12/12 once your canopy fills the space and expect harvest after 7–9 weeks of bloom. Blimburn rates the indoor yield at up to 500 g/m², which is achievable under a decent LED in a well-dialled environment — think 600–1000 PPFD at canopy level, 45–55% RH during flower, and good airflow through those dense bud sites. The Chem genetics do produce thick, resinous flowers, so watch humidity closely in the final weeks to keep mould at bay.

Outdoors, plant after the last frost — April in most of southern and western Europe — and Chemdog #4 will be ready for harvest by mid-October. The 700 g per plant outdoor yield figure assumes a full season in decent soil with plenty of direct sunlight. Greenhouse growers get the best of both worlds: protection from late-season rain plus the natural light spectrum that brings out terpene complexity.

Compared to something like Royal Queen Seeds' Royal Gorilla, Chemdog #4 is more compact and slightly faster to finish. If you want a Chem-line strain that doesn't demand advanced growing skills, this is a solid pick. More experienced growers can push yields further with mainlining or heavy defoliation — the plant handles it well.

Aroma, Flavour, and Bud Structure of Chemdog #4

This is where the Chem genetics earn their reputation. Chemdog #4 produces bright green buds that are thick, dense, and absolutely caked in frosty trichomes. Crack a cured nug open and you get hit with that signature sharp fuel smell — diesel, chemical solvent, and a sour tang underneath. It's not subtle. If you're growing indoors without a carbon filter, your entire flat will know about it by week 4 of flower.

The flavour follows the nose: pungent fuel on the inhale, with a sour, almost citric edge on the exhale. According to research published in the Journal of Natural Products, Chemdawg-type cultivars are typically associated with terpene profiles rich in caryophyllene and myrcene, which contribute to that characteristic peppery, musky fuel character (Booth et al., 2017). The Green Crack parentage adds a subtle sweetness that rounds out the profile, but make no mistake — this is a gassy strain first and foremost.

The resin production is heavy enough to make Chemdog #4 a strong candidate for extraction. If you run a rosin press, these buds squish beautifully. Even dry-sift hash from the trim is worth saving.

Chemdog #4 Seeds: Specifications

Chemdog #4 Grow Tips: Step by Step

1. Germinate your Chemdog #4 feminized seeds using the paper towel method or directly in a moist starter plug. Most seeds crack within 24–72 hours at around 22–25°C.
2. Transplant seedlings into their final containers once they've developed 2–3 sets of true leaves. A 15–20 litre pot works well for indoor grows; outdoor plants benefit from 30+ litres or direct planting in amended soil.
3. Vegetate under 18/6 light until the canopy fills roughly 70–80% of your grow space. Chemdog #4 responds well to LST — gently bend and tie branches during veg to open up the canopy and encourage even bud development.
4. Flip to 12/12 to trigger flowering. Expect some stretch in the first two weeks — typically 30–50% height increase. Adjust your light height accordingly.
5. During weeks 3–6 of flower, maintain humidity between 45–55% and ensure strong airflow. The dense bud structure of Chemdog #4 can trap moisture, so a small oscillating fan aimed at the canopy is non-negotiable.
6. Begin checking trichomes from week 7 onwards using a loupe or pocket microscope. Harvest when most trichomes are milky with a few turning amber — this is where personal preference comes in, but the Chem genetics tend to reward a slightly later chop.
7. Dry in a dark room at 18–20°C and 55–60% RH for 10–14 days, then cure in glass jars for at least two weeks. The fuel aroma intensifies dramatically during a proper cure.

The Chemdawg Origin Story: Why These Genetics Matter

The Chem line is one of the most important genetic families in modern cannabis, and the story behind it reads like stoner folklore — except it's real. In 1991, Greg Krzanowski (known online as "Chemdog") attended a Grateful Dead concert at Deer Creek Music Center in Indiana. He scored some exceptional flower from a fellow concertgoer, and it was good enough that he arranged for additional seeds to be shipped to his home. From that single batch came the original Chem strains: Chemdawg 91, Chemdawg 4, Chemdawg D, and others.

According to research published in PLOS ONE examining cannabis strain naming conventions, Chemdawg variants have been documented under various spellings — "Chemdawg," "Chemdog," "Chem Dawg" — across dispensaries and seed banks, reflecting the informal, pre-regulation era in which these genetics were first shared and propagated (Schwabe et al., 2021). The genetics themselves, however, have remained remarkably consistent in their chemical profile: high resin production, a dominant fuel/chemical terpene signature, and vigorous growth.

What Blimburn Seeds has done with Chemdog #4 is cross that original Chemdawg with Green Crack — a sativa-leaning strain known for energy and speed — to create a hybrid that's more structured, faster to finish, and easier to manage than the original Chem cuts. You still get the gassy nose, the trichome coverage, and the potency. You just don't need a 3-metre ceiling to grow it.

Who Should Grow Chemdog #4 Feminized Seeds?

New growers who want a forgiving strain with serious genetics — start here. Chemdog #4's hardy nature and compact size make it a genuinely good first grow. You'll learn the basics of photoperiod management without fighting an unruly plant, and the yield potential means your first harvest will actually be worth the electricity bill.

Experienced growers will appreciate how well Chemdog #4 responds to training techniques. Mainlining, ScrOG, supercropping — this plant takes it all in stride. The dense bud sites and heavy trichome production also make it an excellent candidate for hash making or rosin pressing. If you're building a mother plant for clones, Chemdog #4 is a strong choice: the feminized seeds eliminate the guesswork, and the genetics are stable enough to produce consistent phenotypes.

The one group who might want to look elsewhere: growers in very humid climates without greenhouse protection. Those dense buds and the mid-October outdoor harvest window mean you're pushing into autumn rain season in northern Europe. A greenhouse or polytunnel solves this, but open-air growers in Scotland or the Netherlands should factor in bud rot prevention.

Frequently Asked Questions

Last updated: April 2026