Green Poison
Cannabis seeds
by Sweet Seeds
Green Poison Feminised Cannabis Seeds by Sweet Seeds
Green Poison is a feminised cannabis seed from Sweet Seeds that delivers indica-dominant genetics with a flowering time of just 8 weeks. Known for its dark green branches that shift to purple during maturation, heavy crystal-coated buds, and THC levels reaching up to 20%, this strain has earned a solid reputation among growers who want reliable, fast results without fussing over temperamental plants. If you're after a straightforward grow with serious yields, this is one of the better options on the shelf.
This guide is written for adults aged 18 and over. The growing characteristics and strain data below are intended for adult cultivators.
Pack Size
Green Poison feminised seeds from Sweet Seeds come in a pack of 3 seeds (SKU: CSSW0020). Each seed is feminised, so you won't waste time identifying and removing males — every seed that germinates should produce a flowering female plant.
Green Poison Growing Characteristics and Genetics
Sweet Seeds bred Green Poison as a fast-flowering indica-dominant hybrid, and the genetics show. Plants develop a large central cola with long, flexible side branches — the kind of structure that fills a grow space efficiently without needing aggressive training. The dark green foliage may turn purple during the later stages of maturation, which looks striking under light and tells you the plant is packing on resin.
THC content reaches up to 20%, and the buds come out dense, heavy, and covered in glittering trichomes. Flowering wraps up in roughly 8 weeks, which is quick for a strain that produces this kind of weight. We've seen growers get impatient with 10-week strains and chop early — with Green Poison, 8 weeks is genuinely enough.
| Specification | Detail |
|---|---|
| Seed Bank | Sweet Seeds |
| Seed Type | Feminised |
| Genetics | Indica-dominant |
| THC Content | Up to 20% |
| Flowering Time | Approximately 8 weeks |
| Indoor Yield | Up to 600 g/m² |
| Outdoor Yield | Approximately 550–600 g per plant |
| Fungus Resistance | Strong |
| Climate Suitability | Humid climates / indoor |
| Seeds per Pack | 3 |
| SKU | CSSW0020 |
Green Poison Yield and Indoor vs Outdoor Performance
Indoors, Green Poison can produce up to 600 g/m² — that's a serious haul for an 8-week flowering strain. Outdoors, expect roughly 550–600 g per plant, with about a 25 g difference between the two environments depending on conditions. The plant's strong resistance to fungus and grey mould makes it particularly well-suited to humid climate zones, which is a genuine advantage if you're growing in Northern Europe or anywhere the air stays damp through autumn.
The indica structure — stocky, with a dominant central cola — means you can pack more plants into a smaller footprint without them fighting each other for light. In a 1m² tent, 4 plants in 11-litre pots is a comfortable fit. SOG (Sea of Green) setups work well here too, given how naturally the strain forms that single fat main bud.
Aroma Profile and What to Expect from Green Poison
Here's the honest bit: Green Poison is loud. The aroma kicks in early in flowering — a very intense, sweet and fruity smell that only gets stronger as harvest approaches. We're not talking a subtle hint of fruit; this is the kind of strain that will announce itself through drywall if your ventilation isn't sorted. Make sure your carbon filter is fresh and your extraction fan is pulling enough air. If you're growing in a shared building, this is non-negotiable.
The buds themselves are dense and sticky, coated in a visible layer of trichome crystals that catch the light. The dark green colour of the branches and leaves, shifting to purple in the final weeks, makes this one of the more visually appealing plants you'll grow. It's the kind of strain you photograph before you chop — and then photograph again after drying.
How to Grow Green Poison Feminised Seeds
- Germinate your feminised seeds using the paper towel method or directly in a starter plug. Keep the environment warm (20–25°C) and moist. Taproots typically emerge within 24–72 hours.
- Transplant seedlings into their final containers once they've developed their first set of true leaves. 11-litre pots work well for indoor grows; outdoors, 20–30 litres gives the roots room to support those heavy colas.
- During the vegetative phase, maintain 18 hours of light. Green Poison's indica genetics mean it stays compact, so you won't need to top aggressively — but removing lower growth that won't receive light (lollipopping) helps direct energy to the main cola.
- Switch to a 12/12 light cycle to trigger flowering. The sweet, fruity aroma starts almost immediately, so activate your carbon filter before flipping, not after.
- Feed with a bloom-specific nutrient schedule. The plants are heavy feeders in weeks 3–6 of flowering as those buds pack on weight.
- Watch for the colour shift from dark green to purple in the final 1–2 weeks. Trichomes should turn from clear to milky-white — that's your harvest window. Around 8 weeks from the flip.
- Dry in a dark, well-ventilated space at 18–20°C and 55–60% humidity for 7–10 days. Cure in glass jars for at least 2 weeks, burping daily for the first week.
Why Green Poison Is Worth Growing
We get asked a lot which feminised strain gives the best return for the least hassle. Green Poison is one of the first names that comes up. The combination of an 8-week flowering period, up to 600 g/m² yield, and genuine fungus resistance means you're not gambling on a long, fragile grow cycle. You plant it, feed it, and 8 weeks later you're trimming fat, crystal-covered buds.
The one thing to watch: that aroma. It's a double-edged sword. The intense sweet and fruity terpene profile is exactly what you want in the final product, but it makes stealth growing almost impossible without proper carbon filtration. If your current filter has been running for more than 6 months, replace it before popping these seeds. We've seen growers underestimate this strain's smell and regret it by week 3 of flower.
Compared to something like Royal Queen Seeds' Royal Cheese — another fast indica — Green Poison edges ahead on yield and fungus resistance, though Royal Cheese has a more pungent, savoury profile if that's your preference. For pure weight and speed, Green Poison is the stronger pick.
Complete your setup: pair Green Poison seeds with a carbon filter and extraction fan kit to handle the intense aroma from early flowering. A pH meter is also worth grabbing — heavy-feeding indicas like this one are sensitive to nutrient lockout if your pH drifts outside 6.0–6.5 in soil.
Green Poison Feminised Seeds — Climate and Resistance
One of Green Poison's standout traits is its strong resistance to fungal attacks and grey mould (botrytis). This isn't marketing fluff — the dense indica bud structure normally makes strains more susceptible to mould, but Sweet Seeds bred this one to handle humid conditions. If you're growing outdoors in the UK, the Netherlands, or anywhere with a damp autumn, this resistance is a genuine practical advantage over many other indica-dominant strains.
Indoor growers in tents benefit too. Even with good airflow, dense buds in a closed environment can develop issues. Green Poison's genetics give you a buffer — though you should still keep relative humidity below 50% during the last 2 weeks of flowering as a precaution.
Frequently Asked Questions
How long does Green Poison take to flower?
Green Poison flowers in approximately 8 weeks from the light flip to 12/12. That's fast for an indica-dominant strain producing up to 600 g/m². Most growers harvest right at the 8-week mark when trichomes are milky-white.
What yield can I expect from Green Poison indoors?
Up to 600 g/m² indoors under optimal conditions. Outdoors, expect 550–600 g per plant. The large central cola and long side branches contribute to the heavy harvest, especially in SOG setups.
Is Green Poison resistant to mould?
Yes. Sweet Seeds bred Green Poison with strong resistance to fungal attacks and grey mould, making it suitable for humid climate zones. Still keep humidity below 50% in the final flowering weeks for best results.
Does Green Poison smell a lot during flowering?
Intensely. The sweet, fruity aroma starts from the very beginning of flowering and only gets stronger. A functioning carbon filter and extraction fan are critical — this strain will overpower a passive ventilation setup easily.
Do Green Poison plants turn purple?
They can. The dark green branches may shift to purple during the maturing stages, particularly in the final 1–2 weeks before harvest. Cooler night temperatures (around 15–18°C) can encourage this colour change.
Are Green Poison seeds feminised?
Yes. Every seed in the pack is feminised by Sweet Seeds, so each germinated seed should produce a female flowering plant. No need to sex plants or remove males.
What is the THC content of Green Poison?
THC levels reach up to 20%. The buds develop dense trichome coverage — visible as glittering crystals — which accounts for the high cannabinoid content. Actual THC depends on growing conditions, light quality, and curing.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.