Auto Critical 47 Express by Positronics – Fast, High-Yielding Autoflowering Strain · Easy Grow for Big Harvests

Auto Critical 47 Express by Positronics isn’t just another autoflower—it’s your shortcut to a mountain of sticky, potent buds in under 9 weeks. This high-yielding powerhouse combines speed, resilience, and serious production, making it a top pick for growers who want maximum output with minimal fuss.

Still relying on slow photoperiods or weak autos that barely fill a jar? You’re wasting time, space, and energy on strains that stretch too much, yield too little, or collapse under mild stress. And let’s be real—nobody wants to babysit a plant for 14 weeks just to end up with airy popcorn.

Now imagine harvesting dense, resin-coated colas in just 8–9 weeks, with zero light cycle changes, no pruning stress, and a plant that laughs at mold and heat. That’s not a dream—that’s Auto Critical 47 Express.

Why Auto Critical 47 Express smokes the competition

Forget the old-school grow-and-pray method. This strain grows fast, stays compact (perfect for stealth), and delivers yields that rival much taller photoperiods. Indoors, it adapts to any setup—SOG, SCROG, or solo—and outdoors, it thrives in Mediterranean or temperate climates, finishing before the autumn rains hit. No more losing crops to botrytis.

Key features you’ll notice from the very first grow

• Ready in just 8–9 weeks from seed to harvest—ideal for quick turnover or multiple cycles per year.
• Massive yields up to 600 g/m² indoors (2.12 oz/ft²) and 120 g/plant outdoors (4.23 oz/plant)—dense, resinous buds guaranteed.
• Compact size: 70–90 cm (27.56–35.43 in) indoors, 90–110 cm (2.95–3.61 ft) outdoors—perfect for discreet grows.
• High resistance to mold, pests, and temperature swings—ideal for beginners and outdoor growers.
• Smooth, balanced high: uplifting yet relaxing—great for daytime or evening use.
• Earthy, sweet aroma with citrus and pine notes—flavourful smoke that lingers without overwhelming.
• THC levels up to 20%—potent but not overwhelming, perfect for recreational and mindful use.

Who this strain is especially interesting for

Whether you're a rookie or a seasoned grower, Auto Critical 47 Express fits like a glove. It’s especially valuable for those who want:

• Fast results without sacrificing quality or yield.
• Discreet, space-saving plants for balconies, closets, or small tents.
• Low-maintenance grows with high resistance to common stressors.
• Multiple harvests per year, especially in greenhouses or indoor setups.
• A reliable strain that performs consistently, harvest after harvest.

How to grow Auto Critical 47 Express without overcomplicating things

Start in a 20 L pot from day one—no transplanting stress. Use a light, airy soil or coco mix with good drainage. Keep the light cycle at 18–20 hours daily. Water when the top inch feels dry, and avoid overfeeding—this strain doesn’t need heavy nutrients. For stronger roots, consider adding Mygal (Mycorrhizal gel) at transplant. In flowering, boost resin production with Liquid Weight Green Planet for denser buds.

Technical specifications

• Breeder / Brand: Positronics
• Type: Autoflowering
• Dominance: Indica-dominant hybrid (70% indica / 30% sativa)
• Genetics: Critical + Auto #47 (selected elite cross)
• Life cycle: 8–9 weeks from seed to harvest
• Indoor yield: Up to 600 g/m² (2.12 oz/ft²)
• Outdoor yield: Up to 120 g/plant (4.23 oz/plant)
• Indoor height: 70–90 cm (27.56–35.43 in)
• Outdoor height: 90–110 cm (2.95–3.61 ft)
• Difficulty: Low
• Structure: Compact, dense branching, minimal stretch
• Climate: Temperate, Mediterranean, continental
• Resistance: High resistance to mold, pests, and heat stress
• Training: Suitable for LST; avoid topping or FIM (not recommended for autos)
• Recommended pot: 20 L final pot from seed
• Light: 18–20 h daily throughout the cycle
• Temperature: 22–26 °C (veg), 20–25 °C (flowering)
• Humidity: 60–70% (seedling), 50–60% (veg), 40–50% (flowering)
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• Smell in grow: Medium (recommended to use a carbon filter in confined spaces)
• THC: Up to 20%
• CBD: Approx. 1%
• Aromatic profile: Myrcene, limonene, pinene
• Flavour: Earthy, sweet, citrus, pine
• Effect: Balanced, relaxing, uplifting—ideal for daytime or evening use

How to grow Auto Critical 47 Express for maximum yield

Quick overview: autoflowering · Positronics · 8–9 week cycle · low difficulty · ideal for indoor tents or outdoor patios.

Safe start: germinate in a moist paper towel or directly in final pot. Transplant only once—if at all.

• Use a 20 L pot from day one to avoid root stress.
• Choose light, well-aerated soil or coco with perlite.
• Keep RH at 60–70% and temp at 22–25 °C.
• Apply Raziel Lite (Liquid rooting) to speed up germination.
• Place under 18–20 h of light from day one.

Stable seedling: focus on root development and strong early growth.

• Water lightly—only when topsoil is dry.
• Use mild nutrients (25–30% strength) in week 2–3.
• Add Mygal to boost root colonization.
• Keep airflow gentle but constant to strengthen stems.
• Avoid any pruning or training in early stages.

Directed growth: support steady development without overstimulation.

• Maintain 18–20 h light cycle—no changes needed.
• Gradually increase nutrients to 50–60% strength.
• Use LST to open canopy—do not top or FIM.
• Ensure good airflow to prevent humidity buildup.
• Monitor pH weekly—keep in optimal range.

Efficient flowering: maximize resin and bud density.

• Switch to bloom nutrients at week 4 (or when pre-flowers appear).
• Lower RH to 40–50% to prevent mold.
• Support branches if needed—colas get heavy.
• Use Liquid Weight from week 5 for denser buds.
• Flush 7–10 days before harvest to improve taste.

Harvest and refinement: time it right for the perfect effect.

• Harvest when 70–80% of trichomes are milky, 20–30% amber.
• Dry at 18–22 °C and 50–60% RH for 7–10 days.
• Cure in glass jars, burping daily for 2–4 weeks.
• Store in a cool, dark place for long-term freshness.
• Enjoy a smooth, balanced high with rich flavour.

Frequently Asked Questions

Is Auto Critical 47 Express good for beginners?

Yes, absolutely. It’s low-maintenance, resistant to stress, and doesn’t require pruning or complex training. Just plant, water, and harvest in under 9 weeks.

Can I grow this strain outdoors in a rainy climate?

Yes, thanks to its high mold resistance. Just make sure it finishes before heavy autumn rains—its fast cycle makes it perfect for shorter seasons.

Do I need to top or prune this autoflower?

No. Topping or FIM can stress the plant and reduce yields. Use LST (low-stress training) instead to shape the canopy gently.

What’s the best nutrient schedule for this strain?

Start mild and increase gradually. Use a complete base nutrient line like Jungle Juice Micro Advanced Nutrients and add bloom boosters in flowering.

How discreet is this plant?

Very. It stays short and bushy, with a medium odor. Use a carbon filter indoors, and it’s perfect for balconies or small spaces.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve grown dozens of autos, but Auto Critical 47 Express stood out from the first harvest. I used to rely on photoperiods for yield, but this one changed my mind. I planted it in a 20 L pot in my balcony tent, gave it 18 hours of light, and forgot about it for weeks. When flowering kicked in, the smell was noticeable but not overwhelming—citrus and earth, like a forest after rain. The buds packed on weight fast, and by week 9, I had dense, trichome-covered colas that tested at 19.5% THC. I cured them for three weeks, and the smoke was smooth, balanced—perfect for chilling after work. I’d recommend this to anyone who wants big harvests without the hassle. It’s now my go-to for quick test grows and backup crops.