Black Rainbow by Seedstockers

Black Rainbow is the kind of plant that makes growers reach for the camera before the trimming scissors. This feminized photoperiod from Seedstockers stacks dark purple and almost black flowers, a sweet dark-fruit nose, and 20–26% THC into one indica-dominant package that finishes in just 8–9 weeks of bloom.

The cross is built on three modern names: Watermelon Zkittlez and Bacio Rainbow were combined first, and that hybrid was then crossed with Apollo Black Cherry. The goal is clear from the first harvest: deep color, heavy fruit terpenes, and a body-centered effect that belongs to the evening.

Plants stay in the medium range, roughly 80–120 cm (31–47 in) indoors, with thick stems that hold up dense flowers. Indoor growers can expect 450–550 g/m² (1.47–1.80 oz/ft²), while outdoor plants in full sun return around 400–600 g/plant (14.1–21.2 oz/plant).

Lineage: Watermelon Zkittlez, Bacio Rainbow, and Apollo Black Cherry

Watermelon Zkittlez brings the candy-fruit terpene drive, while Bacio Rainbow adds structure and color potential. Seedstockers crossed that pairing with Apollo Black Cherry, a dark-fruit line that pushes the deep anthocyanin tones this strain is known for.

The result is an indica-leaning hybrid that selects for dark phenotypes without giving up potency. Expect compact, heavy flowers, short internodes for a plant of its size, and a resin layer that stands out sharply against purple calyxes and orange pistils.

Aroma, Flavor, and Effect

The flavor opens with sweet mixed berries and ripe grape, then turns earthy on the exhale with a smooth finish that many smokers compare to a glass of red wine. The aroma follows the same path: dark fruit first, with a subtle floral and soil-like backdrop underneath.

The effect is unmistakably indica. A warm, heavy body sensation builds slowly from the shoulders down and settles into deep, full-body relaxation. The head stays calm rather than racy, which makes Black Rainbow a strain for late evenings, slow movies, and quiet nights at home rather than busy afternoons.

With THC in the 20–26% range, it rewards a measured approach. Smaller sessions keep things pleasant and mellow; larger ones push firmly toward the couch.

Growing Black Rainbow Indoors and Outdoors

Black Rainbow is rated for intermediate growers, mainly because dense flowers need careful humidity control. Keep relative humidity in check during late bloom, run steady air movement through the canopy, and avoid letting the tent stay damp after lights-off.

Indoors, flip to 12/12 when the plants reach about half the final height you can accommodate. A SCROG net works very well here: it evens the canopy, spreads light across every top, and lifts yields toward the upper end of 450–550 g/m² (1.47–1.80 oz/ft²). Final height usually lands between 80 and 120 cm (31–47 in).

To unlock the darkest colors, drop night temperatures to about 15–18 °C (59–64 °F) during the final two or three weeks of flower. The contrast between near-black buds and bright pistils becomes dramatic.

Outdoors, Black Rainbow likes full sun and can grow into a large plant, producing about 400–600 g (14.1–21.2 oz) each. Because the flowers are tight, plan to harvest before heavy autumn rains arrive to protect the colas from mold.

Black Rainbow Characteristics

Strain type	Feminized
Genetics	(Watermelon Zkittlez x Bacio Rainbow) x Apollo Black Cherry
Indica/Sativa	Indica dominant
THC	20–26%
Effect	Relaxing, heavy body, evening
Flavor	Mixed berries, grape, earthy, wine-like finish
Aroma	Blackberry, plum, grape, earthy-floral
Indoor yield	450–550 g/m² (1.47–1.80 oz/ft²)
Outdoor yield	400–600 g/plant (14.1–21.2 oz/plant)
Flowering time	8–9 weeks
Height	80–120 cm (31–47 in) indoors
Difficulty	Intermediate
Best cultivation technique	SCROG, cooler night temperatures in late bloom

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