Blackjack Feminized Seeds – Nirvana's Sativa-Dominant Hybrid for High Resin & Focus · Fast Flowering, Cold-Resistant

Blackjack Feminized Seeds from Nirvana give you a fast-finishing, high-resin sativa-dominant hybrid that delivers focused energy and bold earthy-citrus flavor—perfect for daytime use and challenging climates.

Worried your next grow won’t survive a cold snap or surprise rainstorm? That sinking feeling when powdery mildew creeps in just before harvest? Or worse—spending weeks on a finicky sativa only to get lackluster yields and weak effects?

It’s frustrating when a strain promises vigor but folds under pressure. You invest time, space, and trust—only to end up with airy buds, stretchy plants, or a harvest ruined by moisture. And if you're growing discreetly, height and smell become real concerns. The last thing you need is a plant that screams 'look at me' or collapses at the first sign of stress.

Meet Blackjack Feminized—Nirvana’s answer to resilient, rewarding grows. Bred from Black Domina and Jock Horror, this hybrid combines sativa-driven focus with indica-like toughness. It finishes in just 8–9 weeks, resists mold and cold, and produces dense, trichome-rich buds even in short summers. Whether you're training for SCROG or planting it in a stealthy corner of your garden, Blackjack stands strong—delivering consistent flavor, potency, and yield without the drama.

Why Blackjack Feminized Is Worth Your Grow Space

Blackjack isn’t just another fast-finishing strain—it’s a reliable workhorse that balances performance, resilience, and quality. With THC levels between 16–20%, it delivers a clear-headed, energizing high perfect for creative work or morning motivation. Its earthy, citrus-pine aroma is bold but not overwhelming, and the flavor lingers with a spicy, moorish kick. Plus, its compact size and resistance to cold and wet conditions make it ideal for outdoor growers in temperate zones. Whether you're a novice looking for a forgiving sativa or an expert optimizing for SCROG, Blackjack earns its spot in your rotation.

Key Features and Benefits

• Fast flowering in 8–9 weeks—perfect for short seasons or quick turnover.
• High resistance to cold, wet weather, and mold—thrives where other sativas fail.
• Produces up to 450 g/m² indoors and 650 g (1.43 lb) per plant outdoors—serious yield potential.
• Compact height of 100 cm (3.28 ft)—ideal for discreet grows and SCROG setups.
• Distinctive citrus, earth, and pine flavor with a pungent, spicy aroma—rich sensory experience.
• Sativa-dominant effect delivers focus, motivation, and mental clarity—great for daytime use.
• Feminized seeds ensure all plants are bud-bearing females—no guesswork or wasted space.
• Responds well to topping, LST, and SCROG—maximize canopy and light exposure.

Common Doubts—Clear Answers

Let’s clear the table on what really matters:

• You think that sativas are too tall and fragile. In reality, Blackjack stays short and stocky, with strong stems and bushy branching—built for resilience.
• You think that fast-flowering means weak effects. In reality, 16–20% THC delivers a potent, uplifting high that lasts—no compromise on potency.
• You think that outdoor plants are prone to mold. In reality, Blackjack’s hybrid vigor gives it high resistance to powdery mildew and botrytis—especially in humid conditions.
• You think that high yield requires complex training. In reality, even untrained plants produce solid returns, but SCROG or topping can significantly boost output.
• You think that pungent strains are hard to hide. In reality, while aromatic, its moderate smell during grow is manageable—especially with proper airflow or a carbon filter.

How to Grow Blackjack Feminized Successfully

1. Start seeds in a humid environment at 22–25 °C; use a propagation dome for best germination.
2. Transplant to final pot early—11–20 L depending on space—and use well-draining soil or coco.
3. Use 18/6 light cycle in veg and switch to 12/12 to trigger flowering after 3–6 weeks.
4. Apply low-stress training (LST) or topping early to create an even canopy—ideal for SCROG.
5. Maintain humidity at 50–60% in veg and drop to 40–50% in flowering to prevent mold.
6. Feed with balanced nutrients in veg, then shift to bloom formula rich in PK during flowering.
7. Harvest after 8–9 weeks when trichomes turn milky—use a jeweler’s loupe to check.

Technical specifications

• Breeder / Brand: Nirvana Seeds
• Type: Feminized
• Dominance: Sativa-dominant hybrid
• Genetics: Black Domina × Jock Horror
• Flowering time: 8–9 weeks (indoor), 56–65 days (outdoor)
• Yield: Up to 450 g/m² (1.5 oz/ft²) indoors · 650 g (22.93 oz) per plant outdoors
• Height: 100 cm (3.28 ft) indoors and outdoors
• Difficulty: Hard (best for intermediate to advanced growers)
• Structure: Short internodal spacing, bushy branching, moderate stretch
• Climate: Thrives in temperate, Mediterranean, and continental climates
• Resistance: High resistance to cold, wet conditions, mold, and mildew
• Training: Excellent for LST, topping, SCROG—responds well to training
• Substrate: Soil or coco—ensure good aeration and drainage
• Light: 18/6 in veg, 12/12 in flowering
• Temperature: 22–26 °C in veg, 20–25 °C in flowering
• Humidity: 50–60% in veg, 40–50% in flowering
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• THC: 16–20%
• CBD: 0.1–1%
• Terpenes: Humulene, Caryophyllene, Pinene
• Flavour: Citrus, earthy, pungent, spicy, pine
• Effect: Focusing, energizing, relieving—ideal for daytime use

Frequently Asked Questions

Is Blackjack Feminized good for beginners?

It’s better suited for intermediate growers due to its sativa tendencies and need for training. However, its resilience to cold and mold makes it forgiving in tough conditions.

How tall does Blackjack get?

It reaches about 100 cm (3.28 ft), making it compact and discreet—perfect for small spaces or stealth grows.

Can I grow Blackjack outdoors in a cold climate?

Absolutely. It’s highly resistant to cold and wet weather, thriving even in short summers—ideal for regions like Northern Europe or Canada.

Does Blackjack smell strongly during flowering?

Yes, it has a pungent, earthy-citrus aroma. Use good ventilation or a carbon filter if growing indoors discreetly.

What’s the best way to increase yield?

Use SCROG, topping, or LST to maximize light exposure. Combined with proper nutrients like Weed fertilizer kit Tripack Flora GHE, you can push yields even higher.

Personal Experience of Pevgrow’s CEO (Alan)

I’ll admit—I was skeptical at first. Sativa-dominant strains? Fast finishers? High resin? Usually, you pick two. But Blackjack surprised me. I grew it in my coastal setup where humidity spikes and autumn comes early. Most sativas would’ve rotted. Not this one. It stood firm, bushy and strong, with dense colas that glistened under the morning dew.

I used LST from week two and ran it under a SCROG net—doubled my yield compared to a free-grow plant. The flavor? Bold. Earthy lemon with a spicy kick. And the high? Clean, focused, no anxiety—perfect for writing or long walks. I’ve seen customers return three times for this strain. Not because it’s easy—but because it’s honest. It doesn’t promise miracles, but it delivers, harvest after harvest. My tip? Don’t rush the flush. Give it 7–10 days. The taste improves dramatically.