Green Poison XL Auto® by Sweet Seeds – Tall, Resilient & High-Yielding Autoflower

Green Poison XL Auto® by Sweet Seeds is a powerhouse 3rd-generation autoflowering strain engineered for taller growth, higher yields, and unshakable resilience — all without sacrificing the beloved sweet Skunk character of its legendary parent.

Are you tired of small, weak autos that barely survive?

Too many growers assume autoflowering means compromise: short plants, low yields, and fragile genetics. But what if you could grow a plant that’s both fast AND big? What if you didn’t have to choose between speed and substance?

Confusion is killing your harvests before they start

Endless forum debates, outdated advice, and exaggerated marketing blur the line between myth and reality. Some say autos can’t be trained. Others claim they’re all weak. The truth? A lot of bad results come from bad habits — like transplanting too late, overfeeding, or using poor genetics. And when the plant underperforms, growers blame the strain, not their setup.

Green Poison XL Auto® is the real deal — no hype, just results

This isn’t another ‘fast but forgettable’ auto. It’s a refined, 3rd-gen specimen bred from the best tall-stemmed Green Poison Auto® plants over multiple generations. You get a strain that grows up to 1.25 m (4.10 ft), produces dense, resin-coated buds, and laughs off stress — all in just 8 weeks from seed to harvest.

Myths vs. Reality: What You Need to Know

• Myth: Autoflowers can’t grow tall. Reality: Green Poison XL Auto® reaches up to 1.25 m (4.10 ft) — 25% taller than average.
• Myth: Autos don’t yield much. Reality: Expect 450–600 g/m² (1.42–1.90 oz/ft²) indoors with proper care.
• Myth: Autoflowers are fragile. Reality: This strain laughs off heat, drought, and transplant shock.
• Myth: Auto buds lack flavor. Reality: Sweet, fruity Skunk with walnut and arugula notes — complex and intense.
• Myth: You can’t train autoflowers. Reality: Gentle LST works great — just avoid topping.

What Green Poison XL Auto® Really Delivers (And What It Doesn’t)

This strain delivers explosive growth, rock-solid resilience, and a balanced high that’s uplifting yet relaxing — perfect for evening creativity or unwinding after work. It produces thick, trichome-heavy buds with a THC level of 15–20%, making it potent but not overwhelming.

What it doesn’t do? It won’t magically fix poor lighting or overwatering. It’s not a photoperiod — so no 12/12 switch needed. And while it’s forgiving, it still needs proper nutrients and airflow to shine. But get the basics right, and it rewards you with a harvest that looks, smells, and tastes like premium hand-trimmed flower.

Advantages and Benefits When Grown Right

• Harvest in just 8 weeks — perfect for quick, discreet grows.
• 25% taller than standard autos — more bud sites, higher yields.
• Thrives in soil or coco — adapts to your setup.
• Resistant to mold and pests — ideal for humid or unpredictable climates.
• Sweet, complex aroma — fills the room without screaming “weed!”.
• Smooth, balanced high — not too cerebral, not too stony.
• Easy to train with LST — maximize light exposure without stress.
• Consistent performance — every seed is a winner.

How to Choose Based on Your Goals

Looking for speed and simplicity? This is your go-to. Want big yields without a long wait? Green Poison XL Auto® delivers. Need a plant that survives mistakes? It’s practically bulletproof.

• If you want fast results: Stick to 18–20h light and avoid late transplants.
• If you want maximum yield: Use a 20–27 L pot and support with HESI Power Zyme for root strength.
• If you’re growing outdoors: Plant in spring for best light and temps.
• If flavor matters: Cure for 3–4 weeks to enhance the sweet Skunk and nutty notes.
• If discretion is key: Its moderate smell and compact structure make it stealth-friendly.

Technical specifications

• Breeder / Brand: Sweet Seeds
• Type: Autoflowering
• Dominance: Indica-dominant hybrid (57% Indica, 40% Sativa, 3% Ruderalis)
• Genetics: Green Poison Auto® × Green Poison Auto® (recurrent selection)
• Life cycle: 8 weeks from germination to harvest
• Indoor yield: 450–600 g/m² (1.42–1.90 oz/ft²)
• Outdoor yield: 60–250 g/plant (2.12–8.82 oz/plant)
• Indoor height: 0.80–1.25 m (2.62–4.10 ft)
• Outdoor height: 0.80–1.25 m (2.62–4.10 ft)
• Difficulty: Low — ideal for beginners
• Structure: Tall, strong stem, dense branching
• Climate: Thrives in Mediterranean, temperate, and continental climates
• Resistance: High resistance to fungi, pests, and water stress
• Training: Suitable for LST and SCROG — avoid topping or FIM
• Recommended pot: 18–27 L final pot, early transplant recommended
• Light cycle: 18–20h light / 4–6h dark (entire cycle)
• Temperature: 22–26 °C (71.6–78.8 °F) in veg; 20–25 °C (68–77 °F) in flower
• Humidity: 60–70% seedling; 50–60% veg; 40–50% flower
• pH: 6.0–6.5 (soil); 5.8–6.2 (coco/hydro)
• THC: 15–20%
• CBD: 0.07%
• Aromatic profile: Limonene, myrcene, pinene
• Flavour: Sweet, fruity, Skunk, walnut, arugula
• Effect: Happy, stimulating, relaxing — balanced cerebral and body high

How to Grow Green Poison XL Auto® for Maximum Results

Get the most from this resilient autoflower with a simple, science-backed approach that works for beginners and experts alike.

Quick overview: Sweet Seeds’ 3rd-gen autoflower · 8-week cycle · low difficulty · ideal for indoor or outdoor in warm climates.

Safe start: Germinate in a warm, moist environment.

• Use a heat mat to maintain 22–25 °C (71.6–77 °F).
• Germinate in Jiffy pellets or moist paper towel.
• Transplant gently when the taproot is ~1 cm (0.39 in).
• For faster rooting, try HESI Power Zyme to boost root development.

Stable seedling: Protect early growth with the right environment.

• Use 18–20h light with a CFL or LED.
• Keep humidity at 60–70% and avoid cold drafts.
• Water lightly — let the top soil dry slightly.
• Add mycorrhizae to improve nutrient uptake and resilience.

Directed growth: Set up for success with early final pot.

• Move to final 20–27 L pot by day 10–14.
• Use airy soil or coco with good drainage.
• Apply Pro Organic Grow (BioThrive Grow) to fuel strong vegetative growth.
• Use LST to spread the canopy and maximize light.

Efficient flowering: Support bud development without stress.

• Keep light at 18–20h — no photoperiod switch needed.
• Maintain RH at 40–50% to prevent mold.
• Boost resin with HESI Phosphorus Plus during peak flowering.
• Avoid aggressive pruning — autos don’t recover well.

Harvest and refinement: Time it right for the perfect high.

• Harvest when 70% of trichomes are milky, 30% amber.
• Flush 7–10 days before harvest with Flush Miner for cleaner taste.
• Dry at 18–22 °C (64.4–71.6 °F) and 50–60% RH for 7–10 days.
• Cure in jars for 3–4 weeks, burping daily.

Frequently Asked Questions

Is Green Poison XL Auto® good for beginners?

Yes. It’s one of the most forgiving autoflowers — resistant to stress, pests, and overfeeding. Just keep the basics right and it’ll thrive.

Can I grow it outdoors in a cold climate?

It prefers warm, sunny conditions. In colder areas, grow in late spring or early summer for best results. Use a greenhouse if needed.

Does it smell strong during flowering?

It has a moderate smell — sweet Skunk with nutty notes. Not the strongest, but use a carbon filter if discretion is crucial.

Can I top or FIM this strain?

No. As an autoflower, it has a fixed timeline. Topping can stunt growth and reduce yield. Stick to LST for shaping.

How many seeds should I start with?

Since it’s 100% feminized, almost all seeds will be female. Start with 1–3 seeds per desired plant for best results.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve grown a lot of autos, but Green Poison XL Auto® stands out. I first tried it in a 20 L AirPot with coco and LED — transplanted at day 12. By week 3, it was already 40 cm (15.75 in) tall and showing pistils. I used a light organic grow booster and switched to bloom nutrients early. The stretch was solid, and by week 6, it hit 1.20 m (3.94 ft). The buds packed on fast — dense, sticky, and full of that signature sweet Skunk. I harvested at 8 weeks, dried slowly, and cured for 4 weeks. The high? Perfect balance — creative but calm. I’ve seen people drop their photoperiods just to stick with this auto. It’s that good. My only tip? Don’t overthink it. This plant wants to succeed.