Jack Flash #5 Feminized Seeds by Sensi Seeds – Uplifting Hybrid with Citrus & Pine Aroma · High Yield Indoors/Outdoors

Jack Flash #5 Feminized Seeds by Sensi Seeds give you a potent, high-yielding hybrid that combines euphoric energy with reliable growth and a bold citrus-pine aroma — perfect for daytime inspiration and creative flow.

Feeling overwhelmed by strains that promise energy but leave you anxious or unfocused?

Too many sativas are all buzz and no balance — harsh highs, spindly plants, disappointing yields. You want something that lifts your mood without burning you out, that grows strong without constant babysitting.

Jack Flash #5 is your reset. Born from Jack Herer, Super Skunk, and Haze, this 65% sativa hybrid delivers a smooth, uplifting high with enough indica calm to keep you grounded. It’s built for growers who want big harvests — up to 600 g (21.17 oz) per plant outdoors — without sacrificing quality or sanity.

Less Stress, More Spark: Why This Strain Just Works

Jack Flash #5 cuts through the noise with stable genetics and a balanced effect. Whether you're chasing creativity or just need a mental boost, this strain adapts to your rhythm. Its robust structure handles indoor training techniques like SCROG or SOG, while its resilience shines in sunny, Mediterranean climates. No more fragile sativas that collapse under their own weight — this one stands tall and delivers.

What You Gain When You Grow Jack Flash #5

• Uplifting, cerebral high that sparks focus and conversation
• Heavy yields — up to 600 g (21.17 oz) per plant outdoors
• Compact indoor growth (up to 1.10 m / 3.61 ft) with dense, resin-coated buds
• Distinctive aroma: earthy pine, citrus zest, and a hint of skunk
• Feminized seeds mean no male plants — just consistent, flower-ready females
• Fast flowering in 55–75 days, ideal for back-to-back grows

How to Build a High-Performance Grow with This Strain

1. Start with a stable seedling environment: 22–25 °C and high humidity
2. Use a well-aerated soil or coco mix to support strong root development
3. Apply gentle LST (Low Stress Training) early to shape bushy growth
4. Switch to 12/12 lighting to trigger flowering after 4–6 weeks of veg
5. Boost bud density in mid-flowering with a quality PK booster like PK 13/14
6. Monitor trichomes: harvest when milky with slight amber for balanced effects
7. Dry slowly at 18–22 °C and 50–60% RH, then cure for 2–4 weeks

Advantages of a Balanced Sativa Powerhouse

• Faster turnaround than pure sativas — ready in under 11 weeks
• Higher yields without stretching out of control
• Resilient to mold and pests when grown in dry, ventilated spaces
• Perfect for social moments, creative sessions, or active days
• Minimal nutrient demands compared to finicky hybrids

Technical specifications

• Breeder / Brand: Sensi Seeds
• Type: Feminized
• Dominance: 65% sativa / 35% indica
• Genetics: Jack Herer × Super Skunk × Haze
• Flowering time: 55–75 days
• Indoor yield: Up to 500 g/m² (16.75 oz/ft²)
• Outdoor yield: Up to 600 g/plant (21.17 oz/plant)
• Indoor height: 1.00–1.10 m (3.28–3.61 ft)
• Outdoor height: 1.80–2.50 m (5.91–8.20 ft)
• Difficulty: Medium
• Structure: Slender sativa or bushy indica phenotype
• Climate: Sunny / Mediterranean
• Resistance: Moderate to mold and pests
• Training: Suitable for LST, SCROG, topping
• Smell in grow: High — use carbon filter recommended
• THC: Approx. 18–22%
• CBD: Approx. 1%
• Aromatic profile: Limonene, pinene, myrcene
• Flavour: Earthy, citrus, pine, skunk, apricot
• Effect: Cerebral, energizing, uplifting — ideal for daytime

How to grow Jack Flash #5 Feminized Seeds

Quick overview: feminized photoperiod strain from Sensi Seeds, 55–75 day flowering, medium difficulty, ideal for indoor or Mediterranean outdoor grows.

For a hassle-free start, Kit Hesi Starterbox Soil gives seedlings the perfect balance of nutrients and pH stability.

In sustained growth, Dutch Formula Grow 1 keeps foliage lush and structure strong without overfeeding.

At the end of flowering, Sensi Cal-Mag Xtra helps prevent deficiencies and supports dense, resinous bud development.

Frequently Asked Questions

Is Jack Flash #5 good for beginners?

It’s better suited for growers with some experience. While stable, its height and high odor require good ventilation and space management.

What’s the difference between the two phenotypes?

One is tall and slender like a sativa, great for vertical grows. The other is compact and bushy, perfect for SOG setups. Both produce heavy, trichome-rich buds.

Can I grow it indoors successfully?

Absolutely. Keep it under 1.10 m (3.61 ft) with LST or early topping. Use a carbon filter — its citrus-pine smell is strong during flowering.

When should I harvest Jack Flash #5?

After 55–75 days of flowering. For a more energetic high, harvest when trichomes are mostly milky. For more relaxation, wait until some turn amber.

Personal Experience of Pevgrow’s CEO (Alan)

I first grew Jack Flash #5 during a summer in Andalusia — long days, dry air, perfect for sativas. I planted three seeds: one exploded vertically, hitting 2.30 m (7.55 ft), while the other two stayed compact and bushy. All three delivered massive yields, but the tall one was a resin factory — sticky buds that smelled like lemon and pine. I used Pure Zym to keep the roots clean and added PK 13/14 in week 4 of bloom. The high was clear, uplifting, and lasted for hours — perfect for hiking or jamming with friends. Not a couch-lock strain. If you want energy with depth, this is your seed. Just don’t skip the carbon filter.