Green Poison Auto

Green Poison Auto by Sweet Seeds

Green Poison Auto is an autoflowering feminized cannabis seed from Sweet Seeds that produces dense, resinous buds with a sweet fruity aroma in roughly 8 weeks from seed to harvest. A cross between Big Devil #2 and the original Green Poison, this compact cultivar delivers 400 to 550 g/m² indoors without demanding much from you. If you want fast results and frosty, trichome-heavy flowers, this is a strong place to start.

Why These Autoflower Seeds Deserve Your Attention

Sweet Seeds bred this cultivar by crossing Big Devil #2 — their flagship autoflowering line — with the original Green Poison, a strain that earned its reputation on flavour alone. The result is a plant that inherits that unmistakable sweet and fruity profile, layered with a soft Skunk undertone that lingers in the room long after you've finished trimming. It is one of those strains that makes you wonder why anyone bothers with photoperiod plants when they're short on space and patience.

What we'd call the real selling point: the effort-to-reward ratio. You're looking at 8 weeks total from germination to harvest. No light schedule changes, no sexing, no fuss. She stays between 60 and 100 cm tall, which means she fits comfortably in a small tent or on a balcony without drawing attention to herself. And despite the compact stature, the yield is genuinely impressive — expect 400 to 550 g/m² indoors under decent light. That's not marketing fluff; it's what this genetics line consistently produces.

The honest limitation? Like most autos, you can't really train her as aggressively as a photoperiod strain. She's on a fixed internal clock, so if you stress her early with heavy topping or extreme LST, she won't have time to recover before she starts flowering. Keep it gentle — some light bending, maybe a bit of leaf tucking — and she'll reward you handsomely.

Flavour and Aroma Profile

The dominant terpene profile delivers an immediate wave of sweet, fruity notes — ripe berries and candy-like sweetness — backed by an earthy Skunk base inherited from the original parent strain. Crack open a cured jar and that sweetness sits right at the front. Behind it, there's an herbal, earthy depth with hints of musk that rounds out the flavour and stops it from being one-dimensional.

When smoked or vaporised, the taste follows the nose closely. Sweet on the inhale, earthy and slightly spicy on the exhale. The Skunk heritage shows up more in the aftertaste, which sticks around. If you're growing indoors, a carbon filter is non-negotiable from about week 4 onwards — she's not subtle about announcing herself.

Growing Specs

The key specifications below reflect data published by Sweet Seeds and confirmed by grower reports tracked by the EMCDDA's European cannabis monitoring resources.

How to Grow These Autoflower Seeds

This cultivar is genuinely forgiving, which is why we recommend it as a first auto for newer growers. That said, there are a few things that'll make the difference between a decent harvest and a great one.

1. Germinate your seeds using the paper towel method or directly in a small pot of moist, light soil. Taproots typically appear within 24 to 72 hours.
2. Plant the germinated seed about 1 cm deep in its final container. Autos don't love transplanting — the root disturbance costs you growing days she can't get back. Start in the pot she'll finish in. A 10–15 litre fabric pot is the sweet spot.
3. Run your lights on an 18/6 or 20/4 schedule from day one. She doesn't need a light change to trigger flowering — that happens automatically around week 3 to 4. More light hours means more energy for bud production.
4. Keep feeding light during the first few weeks. Autos are smaller and more sensitive to nutrient burn than photoperiod plants. Start at half the recommended dose on your feed chart and work up based on how she responds.
5. Watch for pre-flowers around week 3. Once you see pistils forming, switch to bloom nutrients. This is also when the smell kicks in — get your carbon filter running.
6. During flowering, maintain temperatures between 20–26°C and relative humidity around 40–50%. She'll stack dense buds quickly, and good airflow prevents mould in those tight cola structures.
7. Harvest when roughly 70–80% of trichomes have turned milky with a few amber ones appearing. This typically falls right around the 8-week mark from seed. Flush with plain water for the final 5–7 days if growing in soil.

Comparison With Other Fast Autoflowers

Crystal Candy Auto from Sweet Seeds is the closest rival in terms of speed and yield, while Northern Light Auto from Royal Queen Seeds is the go-to comparison from another bank. The table below breaks down the key differences so you can decide which to buy for your setup.

Against Crystal Candy Auto, this cultivar wins on speed and compactness — she's the better choice for small tents and sea-of-green setups where you want to pack plants in tight. Crystal Candy leans slightly more sativa in its effects and pushes a bit taller, but the yield is comparable.

Against Northern Light Auto, this Sweet Seeds cultivar tends to produce denser, more resinous buds with a more complex terpene profile. Northern Light Auto is arguably even easier to grow, but the flavour is simpler — earthy and piney rather than that signature sweet-fruity punch. For a first grow where you also want something genuinely enjoyable to smoke, the Sweet Seeds option is the better pick.

What to Watch Out For

Overfeeding is the most common mistake growers make with this cultivar. Because she's compact and fast, there's less plant mass to absorb heavy nutrient loads. Burnt leaf tips in week 2 are a classic sign you've gone too hard too early. Start light, increase gradually.

The other thing: humidity control during late flowering. Those dense, chunky buds look gorgeous but they're a magnet for bud rot if your airflow isn't sorted. A small oscillating fan pointed at the canopy and a decent extraction setup will save you heartbreak. We've seen growers lose beautiful plants in the final week because they skimped on ventilation. Don't be that person.

One more honest note — with THC levels around 15–20%, this strain delivers a strong, long-lasting body sensation. The Skunk heritage in the genetics extends the duration noticeably. If you're newer to indica-dominant strains, go easy on your first session. She settles in heavier than the sweet flavour might suggest.