How to Grow Red Poison Autoflower
Red Poison is a colorful, fast-finishing autoflowering strain, an auto version of the classic Green Poison. It is a 70/30 indica-leaning plant with a medium 20-22% THC, a fruity, skunky and sweet flavor, and a euphoric, relaxed and creative effect. Striking red and purple buds, a quick 8-week life cycle and easy growing make it a great beginner-friendly auto with real eye appeal.
As an autoflowering strain, Red Poison flowers automatically with age rather than waiting on a change in the light cycle, so there is no need to switch it to shorter days. You simply give it long days from start to finish and it starts flowering on its own after a few weeks, running its whole life cycle in about 8 weeks from seed to harvest. That speed and simplicity are exactly what make autos so easy to grow.
Recommended Strains
Red Poison Auto
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THC | 20% - 22% (Medium) |
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Type | Autoflowering |
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Yield | High |
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Phenotype | 70% Indica / 30% Sativa |
Red Dragon
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THC | 21% - 22% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 55% Indica / 45% Sativa |
Colorful, fruity and quick, Red Poison Autoflower is a rewarding auto to grow whether you are new to it or experienced. You can see the full genetics and buy Red Poison Auto seeds on the strain page, and browse the rest of our autoflowering seeds alongside it.
Strain Profile at a Glance
| THC | Medium (20-22%) |
|---|---|
| Lineage | Green Poison x ruderalis (auto) |
| Type | Autoflowering |
| Genetics | 70% Indica / 30% Sativa |
| Climate | Tropical, warm |
| Life cycle | 8 weeks seed to harvest |
| Harvest (outdoor) | All season |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.31-1.8 oz/ft² (400-550 g/m²) |
| Yield outdoor | 2.82-6.35 oz/plant (80-180 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Fruity, Skunk, Sweet |
| Effects | Euphoric, Relaxed, Creative |
Promos & Deals
Growing an Autoflowering Strain
Red Poison flowers on its own schedule, starting to bloom a few weeks after it sprouts no matter how long the days are. That means you keep it under long light the whole way through, typically 18 hours on and 6 off, or even 20/4, from seedling right to harvest; there is no switch to a shorter day to trigger flowering. The trade-off is that you cannot delay flowering to grow the plant bigger first, so every week of healthy early growth counts.
Because autos grow fast and do not like having their roots disturbed, start Red Poison in its final pot rather than transplanting it. Sow the seed straight into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. With a short life cycle of around 8 weeks from seed to harvest, a smooth start is the single biggest thing you can do for a strong, even finish.
Climate and Where to Grow It
Red Poison suits a warm, tropical-leaning climate and, like most autos, it is flexible about when you plant it. Because it flowers on age rather than on the season, you can run it at almost any time where the weather is warm enough, which is why its harvest window is listed as all season; outdoors you can even fit in more than one cycle in a long, warm year. It is happy both indoors in a tent and outdoors in a sheltered, sunny spot.
Yields are high for an auto, giving around 400-550 g/m² indoors and 80-180 g per plant outdoors on its short cycle. At around 1.5 m it is tall for an autoflower, so give it a little room, keep the canopy open, and support the colorful colas as they fill out. As a standout from our best autoflowering seeds, it delivers a lot of color and flavor from a quick, easy grow.
Keep humidity sensible through flowering to protect those dense, resinous buds: around 55-60% early on, nearer 40% as the flowers fill out, and lower toward harvest. A resin-heavy auto can trap moisture inside its colas, so steady airflow keeps the finish clean. Aim for temperatures around 68-80°F (20-27°C), and let the nights cool a little late in flower to bring out the deep red and purple tones this strain is named for.
Feeding Schedule (EC Guide)
Red Poison is a vigorous auto, but autos want a lighter hand than photoperiod plants, so keep the feed modest and build slowly. Start very light, raise it gently as the plant grows, push a little more phosphorus and potassium through flower, then flush at the end so the fruity, skunky and sweet notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish in the final pot |
| Early growth | 0.8-1.2 | Raise nitrogen gently as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Red Poison starts flowering a few weeks from sprouting and runs its whole cycle in about 8 weeks from seed to harvest, with no change in the light cycle needed. It fills out with dense, resin-coated, trichome-frosted buds that take on striking red and purple tones in a cool finish, developing a skunky aroma over a sweet, fruity base. Because it flowers on age, its harvest comes on a fixed, fast timeline.
Yields are high for an auto: around 400-550 g/m² indoors and 80-180 g per plant outdoors on its short cycle. Keep the colas supported and the canopy open so the lower buds get light, feed it lightly through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest fruity-skunk flavor and the deepest red color.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry matters with dense, resinous buds, because they can stay damp in the middle while the outside dries, and a gentle dry protects both the fruity-skunk aroma and the red-purple color.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the fruity, skunky and sweet notes and smooths the smoke, and it also helps preserve the deep red color that makes this auto stand out.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Red Poison is a resinous plant, so its trim is good for dry sift, bubble hash or rosin. That resin and sweet, fruity-skunk aroma carry right through into a concentrate, so saving the trim turns offcuts into a flavorful, aromatic run rather than waste.
Flavor and Terpenes
Red Poison leads with a sweet, fruity flavor laced with the classic skunk note it inherits from Green Poison, a lively and distinctive profile for an auto. It is a smooth, flavorful smoke, and a good cure really brings that fruity-skunk character forward in the jar and on the inhale.
Its terpene profile shapes that flavor. Caryophyllene drives the warm, peppery, skunky pungency, while myrcene rounds out a sweet, fruity base and terpinolene adds a fresh, herbal lift. Together these three dominant terpenes frame the fruity, skunky and sweet character Red Poison is known for.
Effects and Best Use
With its medium 20-22% THC and indica-leaning 70/30 make-up, Red Poison delivers a balanced, approachable experience. It is reported as euphoric, relaxed and creative, pairing a bright, upbeat head with a comfortable, settled body, which makes it a versatile strain for the later part of the day. Its medium potency keeps it easy to enjoy and easy to dose.
That euphoric, relaxed, creative profile makes it an easygoing all-rounder, good for unwinding or a creative afternoon while enjoying its sweet, fruity-skunk flavor and striking red looks. The combination of a fast, beginner-friendly auto grow, a balanced effect and a colorful, flavorful finish is exactly why this autoflower stands out.
Common Problems and Pro Tips
Red Poison is forgiving, but autos reward a careful start. Sow it straight into its final pot to avoid a transplant check, go light on the nutrients while it is young, and do any training early and gently, because once an auto starts flowering it will not recover lost time. Heavy topping late can cost you yield, so stick to low-stress training and only while the plant is still growing.
At around 1.5 m it is tall for an auto, so give it headroom and support the colas as they fill out and get heavy with resin. Those dense buds can trap moisture, so keep the air moving and humidity sensible through flower, and defoliate a few of the largest fan leaves so light reaches the lower buds. To bring out the deep red color, let the nights cool a few degrees in the last couple of weeks of flower.
As a pro tip, protect what makes this plant special: keep the feed modest, finish with a proper plain-water flush, and give it a full three to four week cure to bring out the fruity-skunk flavor and preserve the red color. Save the resinous trim for concentrates, and harvest when most trichomes are cloudy with a few amber for a balanced, flavorful result from a quick, easy grow.
FAQ
Is Red Poison an autoflowering strain?
Yes. Red Poison Auto flowers automatically with age rather than on a change in the light cycle, so you keep it under long days, usually 18/6 or 20/4, from seedling to harvest. It starts flowering on its own a few weeks after sprouting and runs its whole life cycle in about 8 weeks from seed to harvest, which makes it fast and simple to grow.
Should I transplant Red Poison?
No. Autos grow fast and do not like having their roots disturbed, so start Red Poison straight in its final pot rather than transplanting it. Sow the seed into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. A smooth, uninterrupted start is the single biggest thing you can do for a strong finish.
How do I get Red Poison to turn red?
The deep red and purple tones come out when the nights cool by a few degrees in the last couple of weeks of flower. It is a trait baked into this strain, so a cool, dry finish encourages the color to show in the buds and leaves. A slow, gentle dry then helps preserve that striking red color through to the jar.
How long does Red Poison take?
Red Poison runs its whole life cycle in about 8 weeks from seed to harvest, because it flowers on age rather than on the season. That short, fixed timeline means you can plant it almost any time where it is warm enough, and outdoors you can fit more than one cycle into a long, warm year. There is no light-cycle change to manage.
What does Red Poison taste like?
Red Poison has a sweet, fruity flavor laced with a classic skunk note from its Green Poison side. Caryophyllene drives the peppery skunk pungency, myrcene a sweet fruity base, and terpinolene a fresh herbal lift. A proper three to four week cure really brings that fruity-skunk character forward on the inhale and smooths the smoke.
How much does Red Poison yield?
Red Poison is a high yielder for an auto, giving around 400-550 g/m² indoors and 80-180 g per plant outdoors on its short cycle. Give it a big enough final pot, plenty of light and an open canopy, and support the col.
