Critical Jack Autoflowering
Cannabis seeds
by Silent Seeds
Critical Jack Autoflowering Cannabis Seeds by Silent Seeds
Critical Jack Autoflowering is a feminised autoflowering cannabis seed from Silent Seeds that crosses Critical+ 2.0 with Haze 2.0 Auto for a plant that finishes in 70–80 days flat. No light schedule changes, no males to cull — just drop the seed, keep it fed and watered, and you're looking at dense, trichome-loaded buds in under three months. The genetics bring together the heavy resin production of the Critical lineage with the vigour and aromatic complexity of Haze, all packed into a compact autoflowering frame that suits balconies, small tents, and first-time growers alike.
Pack Size
Critical Jack Autoflowering comes in a single pack of 3 feminised seeds. Every seed is female — no need to sex your plants or waste pots on males that end up in the bin. Three seeds is enough for a small personal run, or you can stagger germination across a couple of weeks to create a rolling harvest.
Why Grow Critical Jack Autoflowering
The appeal here is speed and simplicity. Photoperiod strains need you to flip the light cycle to 12/12 to trigger flowering, which means timing, a lightproof tent, and a longer overall grow. Critical Jack Autoflowering doesn't care about any of that. It starts flowering on its own internal clock, typically around day 20–25, and wraps up the entire cycle — seed to chop — in 70 to 80 days. For growers in northern climates with short summers, that's the difference between harvesting in August and losing everything to October rain.
Outdoors, Silent Seeds rates this cultivar at 100–230g per plant. That's a wide range, and it depends on how much direct sunlight the plant gets, the quality of your soil, and whether you feed it properly. Indoors, the listed yield is 25–100g per square metre — modest by photoperiod standards, but respectable for an auto that finishes this fast. We'd say the indoor figure is realistic for a small tent with a decent LED. If you're running a 60x60 tent with a single plant, expect something in the middle of that range.
One honest note: autoflowers don't recover well from stress. If you overwater in week two or blast them with too-strong nutrients, you can't just extend the veg period to let them bounce back. The clock is ticking from day one. Go easy on the feeding — half-strength nutrients for the first few weeks, then build up gradually. That's the single biggest mistake we see with autos.
Critical Jack Autoflowering Aroma and Terpene Profile
Open a jar of dried Critical Jack Auto buds and you get hit with caramel first — sweet, almost toffee-like — followed by a warm spice that sits somewhere between cinnamon and clove. There's a faint exotic edge underneath, likely from the Haze parentage, that stops it from being one-dimensional. The trichome coverage on this cultivar is genuinely impressive for an auto; buds come out looking like they've been rolled in sugar.
The dominant terpene profile leans sweet and warm. If you've grown Critical+ variants before, you'll recognise that dense, resinous character. The Haze 2.0 Auto side adds complexity — a slight sharpness that cuts through the sweetness and gives the dried flower a more layered nose than your average auto. According to research on cannabis terpenes published in Molecules (2020), terpene profiles can vary substantially between phenotypes even within the same cross, so individual plants may lean more caramel or more spice depending on which parent expresses more strongly.
Critical Jack Autoflowering Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Silent Seeds |
| Genetics | Critical+ 2.0 x Haze 2.0 Auto |
| Type | Autoflowering Feminised |
| Seed to Harvest | 70–80 days |
| Outdoor Yield | 100–230g per plant |
| Indoor Yield | 25–100g per square metre |
| Dominant Terpene Profile | Sweet, caramel, exotic spice |
| Seeds per Pack | 3 feminised seeds |
| SKU | CSDI0003 |
Growing Critical Jack Autoflowering indoors? A complete grow tent kit with LED lighting and carbon filtration gives this cultivar the stable environment it needs to push yields toward the upper end of that 25–100g range. Pair it with a reliable pH meter and autoflower-specific nutrients — overfeeding is the fastest way to stunt an auto, so having precise control over your inputs makes a real difference.
How to Grow Critical Jack Autoflowering Seeds
- Germinate your seeds using the paper towel method or by placing them directly into a small pot of moist, light soil mix. Taproot usually appears within 24–72 hours.
- Plant the germinated seed about 1cm deep in its final container. Autoflowers don't like being transplanted — the root disturbance costs you growing days you can't get back. Use the final pot from the start. An 11-litre fabric pot works well.
- Keep the soil moist but never waterlogged for the first 10 days. Seedlings have tiny root systems and drown easily. Water in a small circle around the stem, not the whole pot.
- Start nutrients at quarter strength around day 10–14, building to half strength by week 3. Autoflowers are sensitive to overfeeding, especially during the first few weeks of life.
- If growing indoors, run your lights on an 18/6 or 20/4 schedule from start to finish. No light cycle change needed — the plant flowers automatically.
- Watch for the first pistils around day 20–25. Once flowering begins, switch to a bloom nutrient with higher phosphorus and potassium.
- Harvest when 70–80% of trichomes have turned milky white under a jeweller's loupe. This typically falls between day 70 and day 80 from germination.
Critical Jack Autoflowering: Indoor vs. Outdoor Growing
Outdoors, Critical Jack Autoflowering thrives in warm, sunny spots with at least 8 hours of direct light. The 100–230g per plant outdoor yield assumes decent conditions — good soil, regular watering, and a climate that doesn't throw frost at you in September. Southern European growers can comfortably run two cycles in a single season: germinate the first batch in April, the second in June, and harvest both before autumn.
Indoors, this cultivar stays compact enough for small tents. A 60x60cm space can hold one plant comfortably; an 80x80 fits two without crowding. The 25–100g per square metre indoor yield is on the lower side compared to photoperiod strains, but you're trading raw weight for speed. A photoperiod Critical Jack might yield double, but it'll take 4–5 months instead of 2.5. If you're after fast turnaround and simplicity, the auto version wins.
One thing to watch indoors: humidity during late flower. The dense bud structure inherited from the Critical+ 2.0 parent can trap moisture, and that's a recipe for bud rot if your airflow isn't sorted. A small oscillating fan pointed at the canopy and proper extraction will keep you safe.
What Makes Critical Jack Autoflowering Different from Other Autos
The Critical+ 2.0 x Haze 2.0 Auto cross gives this strain a terpene profile that's noticeably more complex than many autoflowers in this price range. A lot of budget autos smell vaguely "green" and not much else. Critical Jack Auto actually smells like something — that caramel-spice combination is distinctive and carries through to the cured bud.
Compared to something like a standard Critical Auto, the Haze parentage adds vigour and a slightly taller growth pattern. You're not getting a stubby 30cm plant here; expect 60–90cm indoors with some stretch during early flower. That extra height translates to more bud sites and better light penetration without needing to train the plant aggressively.
The honest limitation: indoor yields. At 25–100g per square metre, you're not going to fill a jar from a single plant the way you might with a high-yielding photoperiod strain. If maximum weight per watt is your priority, a photoperiod Critical would serve you better. But if you want something that's done in 70–80 days with zero light schedule management, this is a solid pick.
Frequently Asked Questions
What does "autoflowering" actually mean for me as a grower?
The plant starts flowering based on age, not light cycle. You don't need to switch to 12/12 lighting or worry about light leaks. Run 18–20 hours of light from seed to harvest and the plant handles the rest. It simplifies indoor growing massively and lets outdoor growers harvest before autumn weather arrives.
Is Critical Jack Autoflowering a good strain for beginners?
Yes. The autoflowering and feminised genetics remove the two biggest beginner headaches: managing light cycles and identifying male plants. The main thing to watch is overfeeding — start with low nutrient concentrations and increase gradually. If you can water a houseplant without drowning it, you can grow this.
Will Critical Jack Autoflowering fit in a small grow tent?
It stays compact enough for a 60x60cm tent, though an 80x80 gives you more room to work. Expect 60–90cm of height indoors. If your tent is very short, you can gently bend the main stem during early growth to keep the canopy flat — a technique called low-stress training.
How much will one Critical Jack Autoflowering plant yield?
Outdoors in good conditions: 100–230g per plant. Indoors under LED: 25–100g per square metre. The wide range reflects differences in light, nutrients, and growing skill. First-time growers should aim for the lower-middle of that range and be pleasantly surprised if they exceed it.
Can I transplant Critical Jack Autoflowering into a bigger pot later?
We'd strongly recommend against it. Autoflowers have a fixed life cycle, and the root stress from transplanting can stunt growth for days you can't recover. Plant directly into your final container — an 11-litre fabric pot is a good size for this cultivar.
What nutrients should I use for Critical Jack Autoflowering?
Any balanced cannabis nutrient line works, but use it at reduced strength. Start at quarter dose around day 10, build to half by week 3, and only go full strength if the plant looks hungry. Switch to a bloom formula once you see the first pistils, typically around day 20–25.
Is Critical Jack Auto more Indica or Sativa?
The genetics lean both ways — Critical+ 2.0 brings Indica-dominant structure and dense buds, while Haze 2.0 Auto contributes Sativa-influenced vigour and a slightly taller growth pattern. In practice, the plant grows like a compact hybrid with dense, resinous flowers.
How do I know when Critical Jack Autoflowering is ready to harvest?
Use a jeweller's loupe or digital microscope to check trichome colour. When 70–80% of trichomes have turned from clear to milky white, it's harvest time. This typically happens between day 70 and 80 from germination. Don't rely on pistil colour alone — trichomes are the accurate indicator.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.