What is Rainbow?
Rainbow is an Indica-dominant hybrid combining Blueberry with Dancehall, producing the colorful purple-magenta-green expression that gives the strain its name. With THC at 15-19% — moderate by modern standards — Rainbow prioritizes flavor complexity, visual appeal, and a balanced effect profile over raw potency. Royal King Seeds offers feminized Rainbow seeds with stabilized expression of the multi-color flower phenotype.
Reported effects
Rainbow delivers a balanced, mellow high that starts with mild cerebral euphoria and settles into a relaxed, slightly creative body experience. The moderate THC level keeps it accessible — a good choice for low-tolerance users, social settings, and creative work without the racy edge of higher-THC Sativas. Myrcene-leaning terpene profile contributes to the gentle relaxation.
These are consumption effects reported by growers and consumers for this cultivar. Nothing here is medical advice or a claim that this plant treats, prevents or relieves any condition.
Growing Rainbow
Rainbow is beginner-friendly: short structure (1.3-1.6x stretch), 9-week flowering, and good resilience to common pests. Cold night temps (15-17°C) in late flower amplify the purple-magenta coloration that gives the strain its name. Indoor yields are moderate (350-450 g/m²) but visual appeal is exceptional. Outdoor harvest is late September to early October in temperate climates.
Frequently Asked Questions
Why is the Rainbow strain colorful?
Rainbow expresses purple, magenta, and green coloration in flower due to anthocyanin pigments triggered by cool night temperatures (15-17°C) in late flower.
Is Rainbow good for beginners?
Yes — Rainbow is short, fast-flowering, and forgiving of minor grow mistakes, making it one of the best Indica-leaning choices for first-time growers.
Compiled and reviewed by the Royal King Genetics team · August 2026. Lineage is the parentage we worked this line from; where a cultivar originated with another breeder, that history belongs to them, not to us. Spotted something wrong? Tell us and we will correct it.
More on the breeding protocol: how a seed line is developed.