Auto Rainbow Sherbet #11 by Advanced Seeds – 27% THC, 500 g/m² Yield, Fast 75-Day Cycle

Auto Rainbow Sherbet #11 by Advanced Seeds is a high-THC autoflowering strain that delivers up to 500 grams per square meter in just 75 days, offering a sweet tropical flavor and balanced cerebral-body effect perfect for any time of day.

Worried your first auto won’t deliver?

It’s normal to hesitate—especially if you’ve tried autoflowers that underperformed, stayed small, or barely packed a punch. You invest time, space, and care, only to get wispy buds and a weak high.

That fear can make you play it safe—low doses, minimal nutrients, no training—keeping you from unlocking the plant’s full potential. You end up with a plant that just… exists, rather than thrives.

Auto Rainbow Sherbet #11 isn’t that strain. Bred for power and resilience, it’s designed to impress even in less-than-ideal conditions. With genetics from Pink Guava and Sunset Sherbert, this auto doesn’t just grow—it dominates. You’ll get dense, resinous buds and a 27% THC kick that balances euphoria with deep relaxation. No more settling for mediocre harvests.

What to expect in your first few grows

At first, you’ll notice a compact, bushy structure with short internodes—ideal for stealth grows. The plant stays manageable at 0.70–0.85 m (2.30–2.79 ft) indoors, but don’t be fooled by its size. Within weeks, it develops thick colas coated in trichomes. Early on, the aroma is subtle—sweet and slightly earthy—but it intensifies dramatically in week 5. You might see purple hues emerge under cooler nights, a visual bonus that hints at its potency. Stick to a simple routine, and you’ll be rewarded with a harvest-ready plant in just 10–11 weeks.

Common mistakes and how to fix them

• Overpotting too early: Use a 3–5 L pot for germination, then transplant to 18–27 L (5–7 gal) to avoid waterlogging.
• Overwatering seedlings: Let the top inch of soil dry between waterings to prevent damping off.
• Using flowering nutrients too soon: Stick to grow formula until pre-flower signs appear around week 3.
• Pruning aggressively: Autos don’t recover well—skip topping and stick to light defoliation if needed.
• Ignoring humidity: Keep RH at 50–60% in veg and 40–50% in flower to avoid mold.

How to fine-tune your grow for maximum results

1. Start with a quality soil mix like Soil Grow for strong roots.
2. Use an 18/6 light cycle indoors—consistent light keeps autos stress-free.
3. Introduce bloom boosters like Bloombastic Soil Box ATA in week 5 for denser buds.
4. Monitor trichomes: Harvest when 70% are milky and 30% amber for balanced effects.
5. Flush with plain water 7 days before harvest to improve flavor and smoothness.

Why treating it as a learning journey pays off

• Greater control over yield and potency with each grow.
• Increased confidence in your growing skills.
• Better understanding of how environment affects flavor and effect.
• Less frustration and wasted time in future cycles.
• Ability to spot issues early and correct them fast.

Technical specifications

• Breeder / Brand: Advanced Seeds
• Type: Autoflowering, feminized
• Dominance: Balanced hybrid (indica-sativa)
• Genetics: (Pink Guava × Sunset Sherbert) × Ruderalis
• Total cycle: 75 days (10–11 weeks from seed to harvest)
• Indoor yield: 450–500 g/m² (15.87–17.64 oz/ft²)
• Outdoor yield: Up to 200 g/plant (7.05 oz/plant)
• Indoor height: 70–85 cm (27.56–33.46 in)
• Outdoor height: 100–120 cm (3.28–3.94 ft)
• THC: Up to 27%
• CBD: Approx. 1%
• Aromatic profile: Limonene, myrcene, caryophyllene
• Flavour: Guava, citrus, tropical fruit, light diesel
• Effect: Cerebral euphoria followed by physical relaxation
• Difficulty: Low to medium
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST; avoid topping
• Recommended pot: 18–27 L (5–7 gal) final pot
• Light: 18–20 hours daily
• Smell in grow: Medium – use a carbon filter if needed

How to grow Auto Rainbow Sherbet #11 – expert tips

Get the most from your Auto Rainbow Sherbet #11 with this concise grow guide.

Quick start: Germinate in a moist paper towel or directly in a starter cube. Transplant once the taproot is 1–2 cm long.

• Use a well-aerated substrate like Soil Grow for optimal root development.
• Keep temperatures at 22–26 °C (71.6–78.8 °F) during veg.
• Water when the top layer feels dry—avoid soggy soil.
• Apply root stimulants like RootFast by Atami at transplant for faster establishment.

Steady growth: Maintain a consistent 18/6 light cycle and monitor for early pistil development.

• Switch to bloom nutrients once pre-flowers appear (around week 3).
• Use LST to open up the canopy and improve light penetration.
• Keep humidity at 50–60% to prevent stress.
• Avoid aggressive pruning—autos don’t recover well.

Flowering boost: Support heavy colas and enhance resin production.

• Add a PK booster like Bloombastic Soil Box ATA in weeks 5–7.
• Ensure good airflow to prevent mold on dense buds.
• Lower humidity to 40–50% in mid to late flower.
• Feed with low N, high P/K nutrients for optimal bud development.

Harvest ready: Time it right for your preferred effect.

• Check trichomes: clear → milky → amber.
• Harvest at 70% milky, 30% amber for balanced high.
• Flush with plain water 7 days before harvest.
• Dry slowly at 18–22 °C (64.4–71.6 °F) and 50–60% RH.
• Cure in jars for 2–4 weeks to enhance flavor and smoothness.

Frequently Asked Questions

How long does it take to grow Auto Rainbow Sherbet #11?

From seed to harvest, it takes about 75 days (10–11 weeks), making it ideal for quick, successive grows.

Can I grow this strain outdoors in a colder climate?

Yes, it’s adaptable and can be grown from late spring to late autumn. In cooler areas, the cycle may extend slightly, but it remains resilient.

Is this strain good for beginners?

Absolutely. With low maintenance needs, resistance to common issues, and forgiving genetics, it’s a top choice for novice growers.

Does it smell strong during flowering?

It has a medium odor—sweet and fruity with a diesel hint. Use a carbon filter if discretion is a priority.

What’s the best way to maximize yield?

Use a final pot of 18–27 L, apply bloom boosters in mid-flower, and maintain optimal light, humidity, and nutrients.

Personal Experience of Pevgrow’s CEO (Alan)

I grew Auto Rainbow Sherbet #11 in my first small tent setup—just 60x60x160 cm—and was blown away. I started with a 3 L pot, transplanted to 20 L at week 3, and used Soil Grow with light organic additives. I kept it simple: 18/6 light, no topping, just light LST. By week 10, the trichomes were milky with amber tips. I flushed, harvested, dried, and cured for three weeks. The result? Dense, purple-tinged buds with a syrupy guava-citrus punch. The high was uplifting at first, then deeply relaxing—perfect for unwinding after work. My biggest lesson? Don’t overthink it. This strain rewards consistency, not complexity.

One small change made a huge difference: switching to Bloombastic Soil Box ATA in week 5. The buds got noticeably denser and more resinous. If you want more from your autos, that’s the move.