Jack 47 F1 Fast Version® Feminized Seeds – Sweet Seeds® | Ultra-Fast Flowering & High THC Sativa Hybrid

Jack 47 F1 Fast Version® feminized seeds from Sweet Seeds® give you ultra-fast flowering, sky-high potency, and a citrus-sweet punch in one sativa-dominant powerhouse – no more waiting weeks for harvest.

Are you tired of waiting forever for your sativas to finish flowering?

Most sativa-dominant strains take their sweet time, stretching out flowering for 9–10 weeks or more. That’s a long time to wait when you're eager to taste fresh buds or need a reliable turnaround. And if you're growing in a tight space or an unstable climate, long cycles mean more risk of mold, pests, or light leaks messing up your crop.

What happens when you stick with slow, outdated genetics?

You waste electricity, risk crop failure, and miss out on multiple harvests per year. Slow strains mean longer veg times, bigger plants, and more stress on your setup. You end up with mediocre yields, inconsistent resin, and a smoke that doesn’t live up to the hype. Worst of all? You’re stuck in a cycle of frustration – planting, waiting, hoping – instead of enjoying the fruits of your labor.

Jack 47 F1 Fast Version® is your shortcut to fast, potent, high-yield harvests

This isn’t just another Jack Herer clone. Jack 47 F1 Fast Version® is a photoperiod feminized hybrid bred from Jack 47® and Jack 47 Auto®, engineered to flower in just 7–8 weeks – one week faster than the original. You get massive 500–600 g/m² yields, THC levels up to 24%, and a vibrant citrus-incense flavor, all without sacrificing quality for speed.

Technical specifications

• Breeder / Brand: Sweet Seeds®
• Type: Feminized and photoperiod-dependent
• Genetics: Jack 47® (SWS08) × Jack 47 Auto® (SWS31)
• Dominance: 75% Sativa / 25% Indica
• Indoor flowering: 7–8 weeks
• Indoor yield: 500–600 g/m² (17.64–21.16 oz/ft²)
• Outdoor yield: maximum (exact g/plant varies by conditions)
• THC: 18–24%
• CBD: 1.4%
• Effects: Psychoactive, stimulating, relaxing
• Flavor: mango, orange, mandarin, sweet, fruity
• Awards: 3rd Prize - Sativa Indoor - II Copa del Rey, Bogotá 2016

Why this strain outperforms regular Jack 47® and other sativas

• Flowers 1 week faster than the original Jack 47®, giving you quicker turnaround and more grows per year
• Produces exceptionally vigorous plants with thick, resin-drenched buds – no fluffy popcorn here
• Delivers a complex aroma of fresh citrus, sweet flowers, and incense – a true sensory upgrade
• Higher resin production means more trichomes, better bag appeal, and stronger effects
• Perfect for indoor setups where space and time are limited
• Ideal for outdoor growers in Mediterranean or temperate climates looking for a fast finish before autumn rains

Real benefits you’ll experience with Jack 47 F1 Fast Version®

You’ll notice the difference from day one. Your plants explode in growth, showing exceptional vigor and resilience. The flowering phase kicks in fast, with dense buds forming early and swelling rapidly. By week 7, you’re already looking at harvest-ready colas covered in glistening trichomes. The flavor is bright and uplifting – think ripe mango and zesty lemon with a smooth, incense-like finish. And the high? It hits fast: cerebral, energizing, and perfect for daytime creativity or social vibes. Whether you're making extracts, rolling joints, or just enjoying a clean smoke, this strain delivers quality without compromise.

Step-by-step growing guide

1. Germinate seeds in a moist paper towel or starter cube at 22–25 °C (71.6–77 °F)
2. Transplant to final pot (11–20 L) once roots emerge – ideal for SCROG or LST training
3. Use a light, well-aerated soil or coco mix with good drainage
4. Provide 18/6 light cycle during vegetative stage for optimal growth
5. Switch to 12/12 to trigger flowering – expect buds in 7–8 weeks
6. Monitor humidity: 60–70% in seedling, 50–60% in veg, 40–50% in flowering
7. Harvest when most trichomes turn milky with some amber for a balanced effect

Frequently Asked Questions

How does Jack 47 F1 Fast Version® differ from the original Jack 47®?

This version flowers one week faster (7–8 weeks vs. 8–9) thanks to its cross with Jack 47 Auto®. It maintains the same high THC and sativa energy but with improved flowering speed and resin production.

Is this strain suitable for beginners?

Yes, it’s beginner-friendly with medium difficulty. It’s vigorous, responds well to training, and doesn’t require extreme conditions. Just avoid overwatering and respect light cycles.

Can I grow it outdoors?

Absolutely. It thrives in warm, sunny climates and finishes fast, making it ideal for regions with short summers. Harvest before late October in the Northern Hemisphere.

What’s the best way to maximize yield?

Use LST or SCROG to spread the canopy and expose more bud sites to light. Pair with Pro Organic Bloom ( Bio Thrive Bloom) during flowering for denser, resin-rich flowers.

Does it have a strong smell during flowering?

Yes, it has a medium to high odor – citrus and incense notes can be pungent. Use a carbon filter like those in Tent Set Pro Aptus to control smell discreetly.

What kind of effects does it produce?

A balanced high: stimulating and psychoactive at first, then gently relaxing. Perfect for daytime use, creative sessions, or social hangs – no couch-lock here.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve grown a lot of sativas, but Jack 47 F1 Fast Version® stands out for its speed and consistency. I ran it in a 1.20 m x 1.20 m (3.94 ft x 3.94 ft) tent with a 600W LED, using LST from week 2. Plants stayed under 90 cm (31.50 in) but produced massive colas. Flowering started at 7 weeks – I was trimming by week 8. The resin was insane; sugar leaves went straight to bubble hash. Flavor is bright: mango and lemon zest with a smooth, spicy finish. I pair it with FloraKleen for a clean flush and smooth smoke. If you want fast, potent, and flavorful, this is your strain.