Tropicanna Poison XL Auto® by Sweet Seeds – Red & Purple Autoflowering Strain with 24% THC

Tropicanna Poison XL Auto® by Sweet Seeds is a powerful, fast-flowering cannabis strain that produces frosty red and purple buds with THC levels up to 24%, delivering a sweet, tropical mango aroma and a creative, stimulating high in just 8 weeks.

Worried your autoflower won’t deliver color, flavor, or power?

Let’s be real: most autoflowers look green, taste generic, and barely hit the spot. You invest weeks of care only to end up with bland buds and weak effects — again.

What if your next grow actually wowed you?

Imagine opening your tent and seeing deep purple and red flowers glistening with resin, filling the room with a rich, sweet mango and woody aroma. That’s not a dream — it’s Tropicanna Poison XL Auto®.

Why Tropicanna Poison XL Auto® actually delivers where others don’t

Bred from elite Tropicanna Cookies (GSC x Tangie) and Red Poison Auto®, this isn’t just another autoflower. It’s a terpene-packed powerhouse designed to impress even picky growers. With up to 550 g/m² indoors and a complex flavor profile, it bridges the gap between speed and quality — no compromises.

Red and purple buds with up to 24% THC in just 8 weeks

• Produces dense, resinous flowers with a sweet, mango-dominant taste and subtle Skunk undertones — perfect for flavor lovers.
• Reaches 0.60–1.20 m (1.97–3.94 ft) tall, making it discreet for indoor grows and balconies.
• Delivers 400–550 g/m² (11.34–15.59 oz/ft²) indoors and 35–125 g (1.23–4.41 oz) per plant outdoors — high yield for an auto.
• Flowers in just 8 weeks from seed, so you’re harvesting fast without sacrificing potency.
• Approx. 85% of plants develop striking purple flowers — a visual upgrade over basic autoflowers.
• THC levels between 16–24% offer a balanced, uplifting high — great for creativity or chilling.

Think it’s too good to be true? Here’s the reality

• You think it’s just another purple auto. In reality, it’s a terpene-rich hybrid with genetics from one of the most famous Cookies strains in the US.
• You think autoflowers can’t be potent. In reality, this one hits up to 24% THC and delivers a strong, flavorful experience.
• You think red/purple phenotypes are rare. In reality, Sweet Seeds stabilized this trait — 85% of plants show it.

How to grow Tropicanna Poison XL Auto® for maximum color and resin

1. Start seeds in a final pot of 18–27 L to avoid transplant stress — ideal for autoflowers.
2. Provide 18–20 hours of light daily; use LED or HPS for best results.
3. Keep temperatures between 22–26 °C (71.6–78.8 °F) in veg and 20–25 °C (68–77 °F) in bloom.
4. Lower humidity to 40–50% in flowering to boost purple pigmentation and prevent mold.
5. Use a balanced soil or coco mix; add mycorrhizae like Funky Fungi B.A.C for stronger roots.
6. Apply bloom boosters like King Bloom by Trabe in mid-flower for denser buds.
7. Harvest when trichomes turn milky to amber for maximum potency and flavor.

Technical specifications

• Breeder / Brand: Sweet Seeds
• Type: Autoflowering
• Dominance: Indica-dominant hybrid (58.4% Indica, 40% Sativa, 1.6% Ruderalis)
• Genetics: Tropicanna Cookies × Red Poison Auto®
• Autoflowering cycle: 8 weeks from germination to harvest
• Indoor yield: 400–550 g/m² (11.34–15.59 oz/ft²)
• Outdoor yield: 35–125 g/plant (1.23–4.41 oz/plant)
• Height: 60–120 cm (23.62–47.24 in)
• Difficulty: Low to medium — suitable for beginners
• Structure: Bushy with tight internodes and strong lateral branching
• Resistance: Good resistance to mold and pests
• Training: Responds well to LST; avoid topping
• Recommended pot: 18–27 L final pot
• Light: 18–20 h daily throughout the cycle
• Temperature: 22–26 °C (71.6–78.8 °F) in veg; 20–25 °C (68–77 °F) in bloom
• Humidity: 60–70% seedling; 50–60% veg; 40–50% flowering
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• THC: 16–24%
• CBD: 0.1%
• Flavor: Sweet, mango, earthy, woody, Skunk
• Effect: Stimulating, creative, balanced body and mind high

Frequently Asked Questions

Does Tropicanna Poison XL Auto® really turn red and purple?

Yes, approximately 85% of plants develop purple flowers, and some show red hues, especially when nighttime temperatures drop during flowering.

Is this strain good for beginners?

Absolutely. It’s forgiving, grows fast, and doesn’t require advanced techniques — perfect for first-time autoflower growers.

Can I grow it indoors and outdoors?

Yes. It thrives both indoors under controlled conditions and outdoors in warm, sunny climates.

How potent is it?

With THC levels up to 24%, it’s one of the stronger autoflowers available — use responsibly.

Does it smell strong during grow?

Yes, it has a powerful aroma, especially in late flowering. Use a carbon filter like Seedfinder if discretion is needed.

Personal Experience of Pevgrow’s CEO (Alan)

I was skeptical at first — red autoflowers that actually deliver? But after growing Tropicanna Poison XL Auto®, I’m a believer. The first time I saw those deep purple colas covered in frost, I knew it was special. I ran two plants side by side: one in 20L soil, one in coco with Coco Grow A+B BAC. The coco version hit harder and smelled even more intense. My only tip: don’t top it. LST works great, but topping stresses it. This strain rewards patience and light training — and the payoff is next-level flavor and resin. Hands down one of the best autos I’ve grown in years.