Critical Jack Auto by Silent Seeds – Fast Autoflowering Feminized Cannabis Seeds with Haze & Spice Aroma

Critical Jack Auto by Silent Seeds is a fast-finishing, feminized autoflowering cannabis strain that packs exceptional yield, aroma, and balanced potency into a compact 70–80 day cycle. This is your shortcut to top-shelf resin without the wait.

Still stuck with slow, low-yielding autos that barely pass the sniff test?

Let’s be real: most autoflowering strains sacrifice flavor, potency, or yield at the altar of speed. You end up with bland buds, weak effects, or plants that barely produce. And if you're growing in a tight space or a humid climate, mold and stretch become your daily enemies. The stress isn’t worth the chill.

Meet Critical Jack Auto — the autoflower that refuses to compromise. Born from the legendary Critical Jack and supercharged with autoflowering genetics, this strain delivers the quality you’d expect from a photoperiod, but on fast-forward. No more choosing between speed and excellence.

Why this autoflower dominates from seed to harvest

From its lightning-fast growth to its resin-drenched buds, Critical Jack Auto is built for performance. Silent Seeds crossed Critical+ 2.0 with Haze 2.0 Auto to create a plant that’s not just fast, but fiercely productive and aromatic. Whether you're a novice or a seasoned grower, this strain earns its spot in your grow room or garden.

Massive yields in record time, indoors and out

• Indoor yields of 450–500 g/m² (15.87–17.64 oz/ft²) — exceptional for an auto
• Outdoor harvests of 100–250 g/plant (3.53–8.82 oz/plant) with minimal care
• Finishes in just 70–80 days from seed — no long waits or complex light schedules
• Compact size (0.50–1.00 m / 1.64–3.28 ft) makes it perfect for stealth grows
• Robust against humidity and pests, ideal for Mediterranean or temperate climates

How to grow Critical Jack Auto for maximum results

Get off to a strong start with the right foundation. This auto thrives when given space early and left to grow naturally.

Quick overview: Autoflowering · Silent Seeds · 70–80 day cycle · Medium difficulty · Ideal for indoor, outdoor, and discreet setups.

Safe start: Germinate in a moist, dark environment at 22–25 °C. Transplant gently once the taproot is ~1 cm (0.39 in) long.

• Use a final pot of 18–27 L (6.36–9.53 ft³) from the start to avoid stress
• Choose a well-aerated substrate like Light Mix BioBizz for optimal root development
• Provide 18–20 hours of light daily — no light cycle changes needed
• Water when the top inch of soil feels dry; avoid overwatering
• For a faster start, SeedBooster Plus enhances germination and early vigor

Directed growth: This plant shows strong vigor and a bushy structure. Minimal training is best — avoid topping or FIM.

• Keep temperatures between 22–26 °C in veg and 20–25 °C in flower
• Maintain humidity at 50–60% during growth, dropping to 40–50% in flowering
• Use a balanced nutrient regime; avoid excess nitrogen in bloom
• Support heavy colas with soft ties if needed
• Ensure good airflow to prevent mold, especially in dense buds

Efficient flowering: Flowering begins automatically after 2–3 weeks. Focus on quality finish.

• Apply Cancerbero Mycorrhizae early to boost nutrient uptake and resilience
• In mid-flower, use a bloom booster like Cultivator Series Bloom to maximize resin
• Flush 7–10 days before harvest for a smoother smoke
• Harvest when trichomes turn milky to amber for a balanced effect

Technical specifications

• Breeder / Brand: Silent Seeds
• Type: Autoflowering feminized
• Dominance: 60% Indica / 40% Sativa
• Genetics: Critical+ 2.0 × Haze 2.0 Auto
• Flowering time: 70–80 days from seed
• Indoor yield: 450–500 g/m² (15.87–17.64 oz/ft²)
• Outdoor yield: 100–250 g/plant (3.53–8.82 oz/plant)
• Indoor height: 0.50–1.00 m (1.64–3.28 ft)
• Outdoor height: 0.50–1.00 m (1.64–3.28 ft)
• Difficulty: Medium
• Structure: Bushy, compact, strong branching
• Climate: Temperate, Mediterranean, tolerates mild humidity
• Resistance: Good resistance to mold, pests, and stress
• Training: Suitable for LST; avoid topping or aggressive pruning
• Recommended pot: 18–27 L final pot from the start
• Light: 18–20 h daily throughout the cycle
• Temperature: 22–26 °C (veg), 20–25 °C (flower)
• Humidity: 50–60% (veg), 40–50% (flower)
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• Smell in grow: Medium to high — consider a carbon filter
• THC: 12–15%
• CBD: 0.01–0.2%
• Aromatic profile: Ocimene, Caryophyllene
• Flavour: Sweet, spicy, Haze, cedar
• Effect: Balanced cerebral and physical buzz, relaxing full-body stone

Frequently Asked Questions

How long does Critical Jack Auto take to harvest?

Critical Jack Auto is ready to harvest in 70 to 80 days from seed, regardless of light cycle. This makes it perfect for quick indoor grows or multiple outdoor harvests per season.

Is Critical Jack Auto good for beginners?

Yes, it's beginner-friendly thanks to its resilience and forgiving nature. However, it’s medium difficulty due to its feeding needs in flower. Avoid overwatering and aggressive training, and you’ll do great.

What does Critical Jack Auto taste and smell like?

It has a rich, complex profile with sweet citrus, spicy notes, hints of cedar, and a classic Haze finish. The aroma is noticeable during flowering, so discretion is advised.

Can I grow Critical Jack Auto outdoors in a cold climate?

Yes, its ruderalis heritage gives it good tolerance to cooler temperatures. Just ensure it gets plenty of sunlight and protect it from heavy rain to prevent mold.

Personal Experience of Pevgrow’s CEO (Alan)

I first grew Critical Jack Auto during a tight summer window in my rooftop setup. I needed something fast, discreet, and potent — and this strain delivered. Planted in 20L pots with Light Mix and a simple nutrient line, it grew bushy and strong without any fuss. By week 10, the trichomes were milky with a hint of amber, and the smell was unreal — sweet, spicy, and unmistakably premium.

What surprised me most was the yield. I got 210 grams from just three plants outdoors — and the quality was better than some photoperiods I’ve grown. The high is smooth: it starts with a clear-headed buzz and melts into deep relaxation. Perfect for unwinding after work or sharing with friends.

I’ve since recommended it to dozens of customers, especially those with limited space or time. It’s not the easiest auto out there, but if you respect its feeding needs and avoid pruning, it rewards you with top-tier bud. A solid 9/10 in my book.