Melted Rainbow Feminized Seeds – Z Head x Runtz Hybrid by The Grateful Seeds

Melted Rainbow by The Grateful Seeds is a limited-edition feminized hybrid that fuses Z Head #18 and Runtz into a terpene bomb with explosive resin production and a lightning-fast 55–60 day flowering cycle.

Ever feel like your grow space is full of underwhelming strains that promise flavor but deliver bland smoke? You’re not alone—so many hybrids look flashy but taste like cardboard and leave your fingers dry. Imagine wasting weeks of care only to harvest buds that barely stick to your scissors. That’s the frustration of chasing hype without genetics to back it up. Melted Rainbow flips the script: it’s bred for growers who demand real terps, serious resin, and results that justify the wait. With its Zkittlez-drenched lineage and Runtz backbone, this one-shot edition delivers exactly what collectors and cultivators crave.

Why Melted Rainbow Stands Out in a Sea of Hybrids

This isn’t just another pretty phenotype—it’s a functional powerhouse. The Grateful Seeds crafted Melted Rainbow for those who want dense, medium-to-tall plants that finish fast without sacrificing yield or aroma. Whether you’re growing in a tight tent or a sun-drenched garden, it adapts with vigor and rewards attention with buds so sticky, they’ll coat your fingers in oily trichomes. It’s ideal for growers tired of waiting 10+ weeks for harvest and ready to experience a true flavor-forward hybrid with backbone.

Key Features and Benefits

• Genetics: Z Head #18 × Runtz – merges Zkittlez sweetness with Runtz’s gassy funk for a complex, loud terpene profile.
• 55–60 day indoor flowering – harvest faster than most photoperiods, perfect for quick turnarounds.
• Huge resin production – buds exude melty, oily trichomes ideal for extractions and sensory satisfaction.
• Medium/high yields – delivers 500–600 g/m² (1.64–2.00 oz/ft²) indoors and 400–1000 g/plant (14.11–35.27 oz/plant) outdoors.
• Compact, dense bud structure – resists mold and supports heavy colas without excessive stretching.
• High THC content – offers a potent, balanced hybrid effect: euphoric lift followed by deep physical relaxation.
• One Shot Edition – limited availability adds collectible value for serious seed hunters.

Common Concerns—Clear Answers

Let’s tackle the doubts head-on:

• You think that fast-flowering means low yield. In reality, Melted Rainbow’s compact structure and vigorous growth deliver medium-to-high yields without the long wait.
• You think it’s too gassy for discreet grows. In reality, while the aroma is loud, proper ventilation and a carbon filter setup easily contain it.
• You think limited editions are just marketing. In reality, The Grateful Seeds’ One Shot releases are carefully stabilized phenotypes—this is a functional strain, not just a collectible.

How to Grow Melted Rainbow Successfully

Maximize flavor, resin, and yield with this streamlined guide:

1. Germinate in a moist, warm environment (22–25°C / 71.6–77°F) and transplant into a final pot early—18–20 L (4.76–5.28 gal) for indoor, larger for outdoor.
2. Use a light, airy substrate like Substrat Complete Mix Top Crop to support root oxygenation and prevent compaction.
3. During veg, provide 18/6 light and gentle LST to open the canopy—avoid aggressive pruning as it’s a photoperiod with moderate stretch.
4. Switch to 12/12 to induce flowering; maintain 40–50% RH and temps of 20–25°C (68–77°F) to protect terpenes and prevent mold.
5. Flush 7–10 days before harvest; aim for milky trichomes with amber tips for a balanced euphoric-to-relaxing effect.
6. Dry slowly at 18–22°C (64.4–71.6°F) and 50–60% RH, then cure in jars for 2–4 weeks to unlock full flavor.

Technical specifications

• Breeder: The Grateful Seeds
• Type: Feminized photoperiod
• Genetics: Z Head #18 × Runtz
• Genotype: Indica-dominant hybrid (approx. 60% Indica)
• Indoor flowering time: 55–60 days
• Outdoor harvest: October (Northern Hemisphere)
• Indoor yield: 500–600 g/m² (1.64–2.00 oz/ft²)
• Outdoor yield: 400–1000 g/plant (14.11–35.27 oz/plant)
• Indoor height: 0.80–1.10 m (2.62–3.61 ft)
• Outdoor height: 1.20–1.80 m (3.94–5.91 ft)
• Difficulty: Medium (tolerant but rewards attention to RH and airflow)
• Smell during grow: High – gassy, funky, with sweet Zkittlez undertones
• THC: High (approx. 20–25%)
• CBD: Low (approx.
• Flavor: Funky, gassy, gelato, with a bright Zkittlez hit
• Effect: Balanced hybrid – cerebral euphoria transitioning to body relaxation

Frequently Asked Questions

Is Melted Rainbow suitable for beginners?

It’s best for growers with basic experience—its fast cycle and mold resistance help, but managing its strong aroma and dense buds requires attention to airflow and humidity.

Can I grow it in a small tent?

Yes! Its medium height and compact structure fit well in 1–1.2 m (3.28–3.94 ft) tents. Use LST early to control vertical growth.

Is it good for hash or rosin?

Absolutely. Its “melty and oily resin” makes it a top choice for extractions—expect high yields of flavorful, potent concentrates.

Why is it called a “One Shot” edition?

It’s a single, stabilized phenotype released once—no future batches. That makes it a collector’s item with real growing potential.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve tested dozens of Runtz crosses, but Melted Rainbow stopped me mid-roll. The first time I broke a bud, my fingers were soaked in resin—it smelled like gas station candy meets diesel, in the best way. I grew it in a 1m² tent with Lemon Kick Plagron for terpene boost, and the result? Dense, purple-tinged colas that tested off the charts for limonene and caryophyllene. My only tip: don’t overfeed. This plant thrives on clean nutrients and dry nights during flower. If you’re chasing flavor over sheer volume, this is your strain. And honestly? It’s worth the hunt while it’s still available.