How to Grow Chemdog Fast Version
Chemdog Fast Version is a sativa-dominant fast-flowering strain (55% sativa), a cross of OG Kush and Sour Diesel with a fast-flowering line for a quicker finish. It carries a potent 22 to 32% THC level, a sharp lemon flavor with a diesel edge, and a deeply soothing, deeply relaxing effect. As a fast version it is a photoperiod plant, not an autoflower, so you flip the lights to bloom and still get a quick, heavy harvest. This guide walks you through the whole grow, from germinating the seeds to the final cure.
It stays short and compact at 1.2 m, flowers in just 7 to 9 weeks, and can be grown all season long with a high yield. Fast, pungent and hard-hitting, it is a lot of potency in an easy, quick-finishing package.
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Chemdog Fast Version
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THC | 22% - 32% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 45% Indica / 55% Sativa |
CBD Chemdog #4
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CBD | 6% – 7% (Low) |
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Type | CBD Feminized |
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Yield | Medium |
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Phenotype | 55% Indica / 45% Sativa |
Chemdog Fast Version at a Glance
Before you plant anything, it helps to see the full picture in one place. Here is the quick profile for this fast, lemon-diesel sativa, taken straight from the strain’s grow data.
| Seed type | Fast Version (photoperiod) |
|---|---|
| Genetics | OG Kush x Sour Diesel |
| Phenotype | 45% Indica / 55% Sativa |
| THC | 22–32% (medium to high) |
| Flowering time | 7–9 weeks |
| Harvest | All season |
| Height | up to 3.94 ft (1.2 m) |
| Yield indoor | 1.64 oz/ft² |
| Yield outdoor | 24.69–29.98 oz/plant |
| Difficulty | Beginner-friendly |
| Climate | Temperate |
| Flavors | Lemon |
| Effects | Deeply soothing and relaxing |
These are fast-flowering seeds, so you get a photoperiod plant that finishes far quicker than usual. Its 55% sativa lean places it among the sativa seeds, and its heavy harvest earns it a spot with the high-yielding seeds. Its quick, forgiving nature also makes it a strong pick from the best seeds for beginners.
Promos & Deals
How to Germinate Chemdog Fast Version Seeds
A healthy harvest starts at germination. The paper towel method is hard to beat: fold the Chemdog Fast Version seeds inside two damp sheets, slide them between two plates, and keep them somewhere dark at 70 to 79°F. A taproot usually appears in two to five days.
Once the taproot is a few millimeters long, move each seed root-down about 1 cm deep into a small pot of light, airy medium. Keep it lightly moist rather than soaked, hold humidity around 65 to 70%, and give soft light while the first true leaves open. Its vigorous, OG-and-Diesel genetics make for a strong, dependable seedling, which is part of why it suits first-time growers.
Starter tips
- Use plain, lightly pH-balanced water (pH 5.5 to 6.5) for the first week.
- Keep seedlings warm and humid, but never waterlogged.
- Hold off on nutrients until the second set of serrated leaves appears.
Growing Chemdog Fast Version in the Vegetative Stage
As a photoperiod plant, you control the veg stage with the light schedule. Keep Chemdog Fast Version on 18 hours of light a day for as long as you want it to grow, aim for day temperatures of 68 to 79°F, and hold humidity around 50 to 60%. It suits a temperate climate, so steady, moderate conditions work in its favor. Because it is a fast version, keep veg on the shorter side so it stays compact around 1.2 m.
This is the stage to shape the plant. A little topping and low-stress training spreads the lower branches, opens up the canopy, and keeps its light sativa stretch in check. Give it room so light reaches the inner buds, and its resin-heavy structure rewards the effort with even, frosty colas.
Flowering and Buds of Chemdog Fast Version
Unlike an autoflower, Chemdog Fast Version is a photoperiod plant, so you trigger flowering by switching to a 12/12 light cycle. The difference is speed: its flowering time is a quick 7 to 9 weeks, much faster than a standard Chemdog. Because it can be grown all season, you can time a run to suit your setup.
Through bloom, drop humidity to 40 to 45% and keep air moving so the dense, resinous buds stay dry. The flowers build a sharp lemon aroma with a pungent diesel edge from its Sour Diesel side, a loud, unmistakable profile.
At 22 to 32% THC it reaches from the medium range well into the high range, giving a deeply soothing, deeply relaxing effect, a heavy, mellow experience that is genuinely strong at the top end.
Common Problems and Pro Tips
Chemdog Fast Version is a beginner-friendly grow, but its loud aroma, resinous buds and high potency point to a few things worth watching.
- Control the smell: its sharp lemon-diesel nose is loud, so a carbon filter is essential indoors if odor matters.
- Protect the resinous buds: its sticky colas can trap moisture, so keep humidity down and air moving in late bloom to avoid mold.
- Mind the potency: THC can reach 32%, so newer or lighter users should start with a little.
Expert tip: remember it is a fast version, not an autoflower, so you still control veg length with the light cycle. Keep veg short for a compact plant, then flip to 12/12 and enjoy the quick, potent finish.
Aroma, Flavor and Effects
The nose is sharp and pungent: a zesty lemon lift over a loud, fuel-like diesel base, the classic chem profile from its Sour Diesel heritage. It is a bold, mouthwatering aroma that fills a room.
The flavor follows the nose, sharp lemon with a diesel bite on the exhale. On the effect side it is deeply soothing and deeply relaxing, a heavy, mellow feel despite its slight sativa lean. Because THC can run from a potent 22% up to 32%, it is genuinely strong, so pace yourself.
Dominant terpenes
Chemdog Fast Version carries a sharp, complex terpene profile. Limonene and Citral drive the zesty lemon that defines its nose, Caryophyllene adds the warm, peppery diesel bite, and Humulene a hoppy, earthy depth. Myrcene lays down a soft base and Linalool a gentle floral touch. A supporting cast of Cedrene, Pinene, Terpineol, Borneol, Cadinene, Camphene, Eugenol, Farnesene, Fenchol, Nerolidol, Phytol and Terpinolene rounds out its lemon, diesel character.
Nutrient Schedule
Treat the figures below as a starting map, not a rulebook. As a fast-flowering, high-yielding, high-THC strain Chemdog Fast Version is a hearty feeder, so read the plant first: tip burn means back off, while pale, slow growth means it wants a little more. All values use EC.
| Stage | EC |
|---|---|
| Seedling | 0.4–0.6 |
| Growth | 0.8–1.2 |
| Early flower | 1.2–1.4 |
| Full flower | 1.4–1.6 |
| Flush | 0.0–0.4 |
Keep the pH around 6.0 to 6.5 in soil and 5.5 to 6.0 in hydro so the roots can actually take up what you feed.
What to Do With Your Trim: Extracts and Hash
Chemdog Fast Version builds a heavy coat of resin, so its trim is worth keeping rather than tossing. The sugar leaves you take off while manicuring hold trichomes and suit Ice Water Hash, where cold water and agitation separate the resin heads into a clean, solventless concentrate. Pressing that hash into rosin keeps the sharp lemon-diesel flavor intact, or you can run a solvent extraction if that is your setup. The bare stems will not extract, but chopped and composted they feed organic matter back into the soil for your next grow.
Harvesting, Drying and Curing Chemdog Fast Version
Timing the harvest comes down to the trichomes. Grab a loupe and watch the heads turn from clear to milky white; a scattering of amber signals peak ripeness. For this fast version that lands a quick 7 to 9 weeks after the flip, and because it runs all season you can time a finish to suit your setup.
After the cut, hang the branches in a dark room at 59 to 68°F with humidity near 50% and gentle air movement. Slow beats fast: drying over 10 to 14 days protects the sharp lemon and diesel aromas that define this strain. When the small stems snap instead of bending, move the buds into jars.
Cure in sealed glass, opening the jars daily for the first week to let moisture escape, then easing off as the aroma deepens. Two to four weeks of patience here is where the zesty lemon and pungent diesel really come together, and it is the step most growers rush.
Frequently Asked Questions
Is Chemdog Fast Version an autoflower?
No, Chemdog Fast Version is a fast version, not an autoflower. It is a photoperiod plant, so you still trigger flowering by switching to a 12/12 light cycle. The difference is speed: a fast-flowering line was added so it finishes in just 7 to 9 weeks while keeping full photoperiod control.
How long does Chemdog Fast Version take to flower?
Chemdog Fast Version flowers in a quick 7 to 9 weeks once you flip it to 12/12 indoors, much faster than a standard Chemdog. It can be grown all season, so you can start a run almost any time and still bring it to a full, quicker-than-usual finish.
Is Chemdog Fast Version good for beginners?
Yes, Chemdog Fast Version is beginner-friendly. Its quick 7 to 9 week bloom and compact 1.2 m size make it forgiving and low-commitment. The main thing to plan for is its loud aroma, which needs a carbon filter indoors, and its high potency, which can reach 32%, so go easy.
How much does Chemdog Fast Version yield?
Chemdog Fast Version is high-yielding, giving around 1.64 oz/ft² indoors. Outdoors a single plant can reach a heavy 24.69 to 29.98 oz, impressive for such a fast strain. Keeping conditions steady through its short bloom helps its dense, resinous colas fill out fully.
How strong is Chemdog Fast Version?
Chemdog Fast Version has a THC level of 22 to 32%, reaching from the medium range well into the high range. The effect is deeply soothing and deeply relaxing, a heavy, mellow feel. Because it can get genuinely strong at the top end, newer and lighter users should start with a little.
What does Chemdog Fast Version taste like?
Chemdog Fast Version leads with a sharp, zesty lemon flavor over a pungent diesel base, the classic chem profile of its Sour Diesel side. It is loud and fuel-like rather than sweet. Both the aroma and flavor deepen noticeably as the buds cure slowly after harvest.
