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How to Grow Rainbow Belts Seeds (2025 Grow Diary)

November 5, 2025 / in Genetics Grow Guides / Mesmerise

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Why Grow Rainbow Belts?

Rainbow Belts is a vibrant hybrid that balances indica calm with sativa creativity. Its fruity-citrus flavor and sticky resin profile make it a favorite for flavor chasers and extractors alike. Growers love its forgiving nature, balanced growth, and heavy terpene punch that fills the room with sweet lemon-fuel aroma.

Balanced hybrid: easy for beginners, rewarding for pros
Fruity, flowery, and diesel terpene combo
Compact height with generous yields
Excellent trichome coverage for extraction

Setup Checklist for Growing Rainbow Belts Seeds

🏕️ Indoor Setup

Tent: 2×2 ft or larger
Light: Full-spectrum LED (300–500W)
Airflow: Inline fan + carbon filter
Medium: Soil or coco + perlite
Pots: 3–5 gallon fabric
pH: 6.2–6.6
Nutrients: Veg/bloom base + Cal-Mag

A labeled diagram of a basic indoor cannabis grow tent setup with full-spectrum LED light, inline fan + carbon filter, clip-on fan, fabric pots, and hygrometer.

🌞 Outdoor Setup

Climate: Warm and sunny
Soil: Well-draining, nutrient-rich
Support: Use stakes for dense buds
Harvest: Early to mid-October

Environment	Height	Yield	Flower Time	Difficulty
Indoor	30–50″	1.5–2 oz/ft²	9–10 weeks	Moderate
Outdoor	30–50″	17–25 oz/plant	Early Oct	Moderate

Germination: Starting Your Rainbow Belts Grow

Use the paper towel method for a reliable start.

Place seeds between two damp paper towels (not soaked)
Cover with two plates to keep the environment dark and humid
Keep around 70–75°F
Once the taproot reaches ½ inch, plant it root-tip down about ½ inch deep in your medium

⚠️ Avoid sealed plastic. Trapped moisture can lead to rot.

Week 1: Seedling Stage

Your Rainbow Belts seedlings will pop through the soil with two bright cotyledons.

Keep light gentle (24–30″ distance from LED)
Humidity: 65–70%
Temp: 72–77°F
Water lightly and keep air moving gently
Avoid feeding yet. Seedlings rely on stored nutrients

By the end of this week, you’ll see the first set of true leaves.

A visual showing the cannabis seedling stage, from sprouted seed to first set of true leaves.

Week 2: Early Veg + First Training

Growth picks up as new leaves and nodes appear.

Feed lightly (¼-strength veg nutrients)
Maintain RH 60–65% and temp 73–78°F
Begin gentle Low-Stress Training (LST) to spread branches
Keep watering around the base; avoid soaking

This helps form a wide, even canopy for future light coverage.

Week 3: Veg Expansion

Your Rainbow Belts plants become bushy and vigorous.

Height: around 8–10 inches
Humidity: 55–60%
Temp: 73–78°F
Increase nutrients to ½-strength
Consider topping at the 4th or 5th node to encourage lateral growth

The leaves should be deep green with strong branching by now.

Week 4: Pre-Flower Prep

Your plant is ready for its flowering transition.

Clean up lower leaves to improve airflow
Drop humidity to 50–55%
Maintain temps around 72–78°F
Stop heavy training, just small tie adjustments now
Switch to full-strength veg feed this week

You’ll start seeing early pistils at the nodes – the first hint of bloom.

Week 5–6: Flower Initiation

Rainbow Belts begins its bloom stretch, forming new bud sites along each branch.

Light cycle: 12/12
Height: up to 30–40 inches
RH: 45–50%
Temp: 70–77°F
Switch to bloom nutrients (low nitrogen, high P & K)

A sweet, fruity aroma emerges, with earthy undertones starting to develop.

A visual showing early cannabis bud development small white pistils, forming calyxes, and early trichome frost

Week 7–8: Bud Development

The fun part begins – buds start swelling fast and resin production explodes.

Trichomes begin to frost the sugar leaves
RH: 40–45% to prevent mold
Temp: 68–75°F
Maintain strong airflow and light defoliation
Optional: Add a terpene booster for even louder aroma

Expect a fruity-lemon scent that’s both sweet and sharp.

Week 9–10: Ripening & Flush

Your Rainbow Belts colas will now be thick and sticky, showing bright pistils and a rainbow of hues.

Start flushing with clean, pH-balanced water
Temp: 65–70°F
RH: 35–40%
Check trichomes: mostly cloudy with a few amber
Harvest when 70–80% of pistils darken

This stage defines the flavor and smoothness of your final buds.

Image showing cannabis trichomes at different maturity stages: clear, cloudy, and amber

Harvest & Curing

Dry: Hang whole branches for 10–14 days at 60°F and 55% RH
Cure: Transfer to glass jars, burping daily for the first week
Allow 3–4 weeks of curing to unlock the full tropical-diesel flavor

The finished buds should sparkle with trichomes and smell like a fruit smoothie with a diesel kick.

Final Thoughts on Growing Rainbow Belts Seeds

Rainbow Belts is the perfect hybrid for growers who crave color, balance, and bold aroma. It stays compact, yields generously, and bursts with fruity-citrus flavor when grown with care.

Balanced 50/50 genetics – ideal for all growers
Dense, resin-coated buds perfect for extraction
Uplifting and sociable high that inspires creativity

👉 Shop Rainbow Belts Seeds at Hypno Seeds
🌿 Explore more Hybrid Seeds
🔗 Learn more about Rainbow Belts on Leafly

FAQ: Growing Rainbow Belts Seeds

How long does Rainbow Belts take to flower?
9–10 weeks indoors, harvest around early October outdoors.

How tall does it grow?
30–50 inches; compact and easy to manage.

What yields can I expect?
Up to 2 oz/ft² indoors or 25 oz/plant outdoors.

What does it taste like?
A mix of sweet fruit, lemon, diesel, and earthy tones.

What effects does it have?
Creative, happy, and sociable – great for daytime use.