Royal Jack Auto by Royal Queen Seeds – Fast Autoflowering Sativa Hybrid for Creative Daytime Use

Meet Royal Jack Auto by Royal Queen Seeds – a fast, sativa-dominant autoflower that delivers creative energy and impressive yields in just 9–10 weeks, perfect for discreet and reliable grows.

Worried your grow won’t deliver on time, or that your plants will be too tall or too fussy? You’re not alone. Many growers stress about unpredictable cycles, stretchy sativas, or plants that demand constant attention. It’s frustrating when you want quality, but your space or schedule says otherwise.

That anxiety builds when you’re stuck with photoperiod strains that need light cycle changes, or autos that barely produce. You end up sacrificing yield, discretion, or peace of mind. The last thing you need is a plant that grows like a vine or collapses at the first sign of stress.

Enter Royal Jack Auto: the compact, resilient autoflower that packs the legendary Jack Herer genetics into a low-maintenance, high-reward package. It finishes fast, stays short (0.40–0.80 m indoors), and produces up to 400 g/m² (11.80 oz/ft²) of spicy, peppery bud — all without light cycle manipulation. It’s the discreet, dependable grow you’ve been waiting for.

Compact Size, Maximum Discretion

With a final height of 0.40–0.80 m (1.31–2.62 ft) indoors, Royal Jack Auto is built for stealth. Whether you're growing in a small tent, a balcony, or a hidden corner, its compact structure keeps you under the radar. It doesn’t stretch excessively during flowering, so you won’t need to top or aggressively train it — a major plus for beginners and low-profile setups.

The plant’s dense branching and bushy form fill space efficiently without spilling over. Its manageable size also means you can fit more plants per square meter, boosting your total yield without sacrificing control.

Total Control Over Your Grow Cycle

• Autoflowers from seed to harvest in just 50–55 days, no light schedule changes needed
• Stable genetics ensure consistent performance, plant to plant
• Compact height (0.40–0.80 m) fits perfectly in small tents or stealth grows
• Resilient to temperature swings and minor nutrient imbalances
• Thrives in both soil and coco, adapting to your preferred medium
• Low odor profile reduces the need for heavy carbon filtration
• Consistent yields of 350–400 g/m² (10.36–11.80 oz/ft²) indoors

How to Grow Royal Jack Auto Successfully

For a strong start, germinate seeds in a moist, dark environment at 22–25°C. Transplant once the taproot is about 1 cm long. Use a well-draining soil or coco mix to prevent overwatering.

1. Start in a final pot of 18–27 L to avoid transplant stress and encourage root development
2. Provide 18–20 hours of light daily throughout the entire cycle
3. Water when the top inch of soil feels dry — avoid waterlogging
4. Use mild nutrients, increasing gradually as the plant matures
5. Apply Bio Rhizotonic early to boost root health and resilience
6. Support branches with soft ties if needed during mid-flowering
7. Keep humidity at 40–50% in flowering to prevent mold
8. Harvest when trichomes turn mostly milky with some amber for a balanced effect

Why Growers Love This Strain

• More confidence in every grow — no guesswork, no surprises
• Greater peace of mind knowing your plant is resilient and low-maintenance
• Enjoy a reliable, creative high perfect for daytime productivity
• Feel proud of dense, aromatic buds with a spicy, earthy flavor
• Experience the legacy of Jack Herer in a modern, easy-to-grow format

Technical specifications

• Breeder / Brand: Royal Queen Seeds
• Type: Autoflowering
• Dominance: Sativa 40% / Indica 30% / Ruderalis 30%
• Genetics: Jack Herer × Ruderalis
• Life cycle: 50–55 days from seed to harvest
• Indoor yield: 350–400 g/m² (10.36–11.80 oz/ft²)
• Outdoor yield: 70–120 g/plant (2.47–4.23 oz/plant)
• Indoor height: 0.40–0.80 m (1.31–2.62 ft)
• Outdoor height: 0.60–0.80 m (1.97–2.62 ft)
• Difficulty: Low
• Structure: Bushy, dense branching, moderate stretch
• Climate: Temperate, Mediterranean, long summers
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST; avoid topping or FIM
• Recommended pot: 18–27 L final pot from the start
• Light: 18–20 h daily (entire 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 – a carbon filter is recommended in confined spaces
• THC: Up to 16%
• CBD: Medium (1–3%)
• Aromatic profile: Earthy, herbal, pepper, pine
• Flavour: Spicy, herbal, with pine and pepper notes
• Effect: Creative, motivating, uplifting – ideal for daytime use

How to grow the seed

Fast, resilient, and beginner-friendly — Royal Jack Auto thrives with minimal intervention.

Quick overview: Autoflowering · Royal Queen Seeds · 50–55 day cycle · ideal for small spaces and Mediterranean climates.

Safe start: Germinate in a damp paper towel at 22–25°C.

• Transplant when the taproot reaches ~1 cm
• Use a light, airy seedling mix
• Keep humidity high (60–70%)
• Apply Bio Rhizotonic to strengthen roots early

Stable growth: Move to final 18–27 L pot immediately.

• Provide 18–20 hours of light daily
• Water when topsoil is dry
• Use mild organic nutrients
• Train gently with LST if needed

Flowering support: Monitor trichomes from day 45.

• Maintain RH at 40–50% to prevent mold
• Boost bud density with Megabud in mid-flowering
• Avoid pruning — autos don’t recover well
• Flush 7–10 days before harvest

Frequently Asked Questions

Is Royal Jack Auto good for beginners?

Yes. Its autoflowering nature, resilience, and forgiving growth pattern make it perfect for first-time growers.

How discreet is this strain?

Very. It stays short (under 0.80 m) and has a medium odor, making it ideal for stealth grows with basic ventilation.

Can I grow it outdoors in a cold climate?

It prefers long, warm summers. In cooler areas, grow in a greenhouse or during the warmest months for best results.

Does it need topping or pruning?

No. Avoid topping or aggressive pruning. Use low-stress techniques like LST instead.

What’s the best time to harvest?

Harvest when most trichomes are milky with some amber for a balanced, uplifting effect.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve grown Royal Jack Auto three times now, and it’s become my go-to for quick test grows and reliable daytime sessions. What impresses me most is how forgiving it is — I once left it in a hot tent (up to 30°C) for days while traveling, and it bounced back without stress. I grow it in 20 L pots with a light soil mix, and I never top it. Instead, I use gentle LST to open up the canopy. By week 4, it’s a bushy powerhouse. I feed it lightly, ramping up only in mid-flowering, and I always add Megabud for denser buds. The high is clean, creative, and never overwhelming — perfect for working or socializing. It’s not the most pungent, but the spicy, piney aroma is unmistakable. If you want a no-drama grow that delivers quality bud in under 10 weeks, this is it.