Mental Rainbow F1 Fast Version® by Sweet Seeds – Fast-Flowering, High-THC Hybrid with Tropical Flavors

Mental Rainbow F1 Fast Version® by Sweet Seeds is a photoperiod-dependent powerhouse that delivers top-tier potency and exotic flavor in record time, perfect for growers who want big results without the long wait.

Are you tired of waiting months to harvest?

Most photoperiod strains keep you on edge for 10–12 weeks in flowering — time that eats up electricity, nutrients, and patience. In humid climates, that extra time also means higher risk of mold wiping out your entire crop just before harvest.

What happens if you keep growing slow-flowering strains?

You’re not just wasting weeks — you’re burning through power, increasing the chance of pests or mold, and delaying your next grow. For outdoor growers in rainy areas, that late-October harvest window can mean a soggy, ruined yield. And let’s be real: who wants to wait that long when your stash is running low?

The solution: Fast-flowering power without compromise

Mental Rainbow F1 Fast Version® cuts the flowering time to just 7–8 weeks while keeping the high THC (up to 30%) and complex terpene profile of its elite Californian lineage. It’s the best of both worlds: photoperiod flexibility with autoflowering speed. Whether you're indoors or out, you’ll harvest earlier, save on costs, and avoid the autumn mold rush.

What this strain does for your grow

From rapid harvests to explosive aromas, Mental Rainbow F1 Fast Version® transforms your grow into a high-efficiency, high-reward experience. Compact and resilient, it’s built for discretion and performance — no wasted space, no wasted time.

Key features and benefits in a nutshell

• 7–8 week flowering → harvest weeks earlier than standard photoperiods, saving energy and effort
• THC 22–30% → powerful, balanced high that lifts your mood and melts stress
• Mango, papaya, citrus aroma → a tropical punch that lingers on the palate and in the room
• Abundant trichomes → ideal for extracts, hash, and high-potency products
• 65% indica dominance → compact, bushy structure perfect for small spaces or stealth grows

How to grow Mental Rainbow F1 Fast Version® for best results

Optimized for speed and resilience, this strain thrives with simple, smart techniques. Start with a stable seedling phase and maintain control through flowering for maximum yield and flavor.

1. Germinate seeds in a moist paper towel or starter cube; transplant once the taproot is 1–2 cm (0.4–0.8 in) long.
2. Use 11 L pots indoors at 9 per m² (0.84 ft²) and apply Bio Boost by Canna to strengthen roots and early growth.
3. Run an 18/6 light cycle until flowering; switch to 12/12 to trigger bloom.
4. Apply LST or SOG techniques early to maximize light exposure and bud sites.
5. Support heavy colas with stakes, especially outdoors, to prevent breakage under 350–500 g (12.35–17.64 oz) of dense, resinous buds.

Technical specifications

• Breeder / Brand: Sweet Seeds
• Type: Feminized / Photoperiod-dependent
• Dominance: 65% Indica / 35% Sativa
• Genetics: Rainbow Sherbert #11 × Papaya Zoap Auto®
• Indoor flowering: 7–8 weeks
• Outdoor harvest (N. Hemisphere): September – October
• Indoor yield: 450–500 g/m² (15.87–17.64 oz/ft²)
• Outdoor yield: 350–500 g/plant (12.35–17.64 oz/plant)
• Indoor height: 80–110 cm (2.62–3.61 ft)
• Outdoor height: 1.20–1.50 m (3.94–4.92 ft)
• THC: 22–30%
• CBD: 0.1%
• Aromatic profile: Mango, papaya, citrus, earthy, spicy
• Effect: Euphoric, uplifting, relaxing, creative
• Difficulty: Low to medium
• Resistance: Good resistance to mold and pests

Frequently Asked Questions

How long does Mental Rainbow F1 Fast Version® take to flower?

Indoors, it flowers in just 7–8 weeks. Outdoors, harvest is typically ready between September and October in the Northern Hemisphere.

Is this strain good for beginners?

Yes, it’s beginner-friendly thanks to its resilience, compact size, and fast cycle. Just avoid overwatering and respect light cycles.

Can I use this for extractions?

Absolutely. Its heavy trichome coating makes it a top choice for hash, rosin, and other concentrates.

Does it smell strong during grow?

Yes, it has a powerful tropical aroma. Use an odor filter if discretion is a priority.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve tested a lot of fast-flowering strains, but Mental Rainbow F1 Fast Version® stands out. I grew it in my 1.20x1.20 m (3.94x3.94 ft) tent with a 600W LED, and it filled the space perfectly in just 8 weeks of bloom. The smell during flowering was unreal — like opening a fresh fruit market. I used LST to spread the canopy and got over 480 g (16.93 oz) of frosty, dense buds.

What really blew me away was the effect: a clear-headed euphoria that didn’t knock me out, followed by deep relaxation. I shared it with friends and everyone agreed — it’s a social strain that also works for unwinding. I’ve already ordered more seeds because it’s become my go-to for quick-turnaround grows. If you want speed, flavor, and power in one package, this is it.