Original Auto Jack Herer 420 Fast Buds – High-Yielding Sativa-Dominant Autoflower with 21% THC & Citrus-Pepper Flavor

Jack Herer Auto by Fast Buds is a high-THC, sativa-dominant autoflower that delivers massive yields and a bold citrus-pepper flavor in just 9 weeks. This award-winning strain is perfect for growers who want quality, speed, and consistency.

Are you tired of waiting months just to see results?

Most sativa-dominant strains take forever to flower, leaving you stuck in limbo with no harvest in sight. You invest time, energy, and space, only to end up with mediocre yields or weak effects. It’s frustrating when your grow doesn’t deliver what it promised.

What if you could grow a legendary sativa in under 10 weeks?

Imagine harvesting dense, trichome-drenched buds in just 63 days — without flipping lights or stressing over training. Jack Herer Auto ends the wait. With genetics upgraded from the original Jack Herer and Fast Buds’ autoflowering mastery, this strain delivers 400–500 g/m² (1.3–1.6 oz/ft²) of high-potency flower, even in tight spaces.

Jack Herer Auto: Fast, Flavorful, and Built for Real Growers

• Feature: Sativa 65% / Indica 35% hybrid with Jack Herer x Fast Buds Auto #1 lineage
• Advantage: Delivers a balanced, clear-headed high without sedation
• Benefit: You stay focused and creative — perfect for daytime use, gaming, or artistic sessions

• Feature: 9-week flowering cycle from seed to harvest
• Advantage: No light cycle changes needed — grows under 18–20h light
• Benefit: You get fast, predictable results without complicated setups

• Feature: Compact size: 0.70–0.90 m (2.30–2.95 ft)
• Advantage: Fits in small tents or discreet outdoor spots
• Benefit: You can grow high-quality bud even in limited space

• Feature: Earthy, lemon, spicy, sweet terpene profile
• Advantage: Rich flavor with a peppery, mango-citrus finish
• Benefit: You enjoy a full-spectrum smoke that tastes as good as it feels

• Feature: Heavy trichome coverage and high resin production
• Advantage: Ideal for hash and rosin extraction
• Benefit: You get more value from every gram — perfect for concentrate lovers

Technical specifications

• Breeder / Brand: Fast Buds
• Type: Feminized autoflowering
• Dominance: Sativa 65% / Indica 35%
• Genetics: Jack Herer × Fast Buds Auto #1
• Flowering time: 9 weeks (63 days from seed)
• Indoor yield: 400–500 g/m² (1.3–1.6 oz/ft²)
• Outdoor yield: 60–140 g/plant (2–5 oz/plant)
• Indoor height: 0.70–0.90 m (2.30–2.95 ft)
• Outdoor height: 0.70–0.90 m (2.30–2.95 ft)
• THC: 21% (approx.)
• CBD:
• Difficulty: Low – ideal for beginners
• Structure: Medium internodal spacing, strong branching, moderate stretch
• Climate: Performs well in hot to moderate climates; tolerates cooler temps
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST; avoid topping or FIM
• Recommended pot: 18–27 L final pot (early transplant)
• Light: 18–20h throughout 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: Strong – carbon filter recommended
• Aromatic profile: Limonene, myrcene, caryophyllene
• Flavour: Earthy, lemon, spicy, sweet with mango-citrus finish
• Effect: Balanced – uplifting, euphoric, focused, great for daytime

How to grow Jack Herer Auto successfully

Get the most out of your grow with this simple, phase-by-phase guide based on real grower results and Fast Buds’ genetics.

Quick overview

Fast-flowering sativa-dominant autoflower, 9-week cycle, low difficulty, ideal for indoor and outdoor.

• Perfect for beginners and commercial growers
• Compact size fits small spaces
• High resistance to stress and temperature swings
• Thrives under 18–20h light all cycle
• Best grown in 18–27 L pots for max yield

Safe start

Begin strong with a solid germination and early transplant.

• Germinate in jiffy pellet or water at 22–25 °C
• Transplant when taproot is ~1 cm long
• Use well-aerated soil to prevent damping off
• For faster rooting, Piranha Advanced Nutrients boosts early development
• Keep humidity at 60–70% for first week

Directed growth

Keep your plant healthy and on track during veg.

• Provide 18–20h light daily
• Water when topsoil feels dry
• Use Grow Ph Perfect Advanced Nutrients for balanced veg growth
• Apply light LST to improve light penetration
• Avoid topping — autoflowers don’t recover well

Efficient flowering

Maximize bud density and resin production.

• Lower humidity to 40–50% to prevent mold
• Ensure strong airflow with oscillating fans
• Add Sensi Cal-Mag Xtra to prevent deficiencies
• Use PK boosters in weeks 5–7 for bigger buds
• Watch trichomes: harvest when milky with slight amber

Harvest and refinement

Finish strong with proper drying and curing.

• Flush with plain water 7–10 days before harvest
• Cut branches and hang upside down
• Dry at 18–22 °C and 50–60% RH for 7–10 days
• Cure in jars for 2–4 weeks, burping daily
• Final cure enhances flavor and smoothness

Frequently Asked Questions

How long does Jack Herer Auto take to grow?

From seed to harvest, Jack Herer Auto takes about 9 weeks (63 days). It’s one of the fastest sativa-dominant strains available, making it ideal for quick turnarounds.

Does Jack Herer Auto smell strong during flowering?

Yes, it has a strong, pungent aroma — especially in late flowering. Use a carbon filter if growing indoors to stay discreet.

Can I grow Jack Herer Auto outdoors in a cold climate?

Yes, it tolerates cooler temperatures well. Just ensure it gets plenty of sunlight and protect it from heavy rain to avoid mold.

Is Jack Herer Auto good for hash production?

Absolutely. It’s covered in trichomes and produces high-quality resin — perfect for rosin or dry sift. Many growers report excellent extraction yields.

Personal Experience of Pevgrow’s CEO (Alan)

I first grew Jack Herer Auto during a tight urban setup with limited space and light. I was skeptical — most sativas take forever and stretch like crazy. But this one stayed compact, hit 85 cm (2.8 ft), and started flowering like clockwork at week 3. By week 9, I had dense, frosty buds that smelled like lemon pepper and earth. The high was smooth, uplifting, and kept me creative all day — no couch lock. I made rosin from the trim, and it turned out golden and flavorful. My only mistake? I topped the first plant — it slowed down and underperformed. Now I stick to LST only. If you want fast, high-quality flower without the hassle, this is your strain.