Black Unicorn by Riot Seeds
Black Unicorn is an indica-leaning cannabis strain from Riot Seeds, bred by crossing Purple Unicorn × Black Grapes. Indoors it typically finishes flowering in around 67 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Black Unicorn grows against.
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Similar strains
| Breeder | Riot Seeds |
|---|---|
| Type | indica |
| Flowering time | ±67 days |
| Environment | Outdoors |
| Lineage | Purple Unicorn × Black Grapes |
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🧬 Explore the family: Purple Unicorn · Black Grapes
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Growing Black Unicorn: what to expect
As an indica-leaning plant, expect a modest stretch after the flip (roughly 50–100%) and dense bud structure — which makes late-flower humidity discipline the main risk: keep RH in the 40s once buds fatten to stay ahead of mold. Growers familiar with Purple Unicorn or Black Grapes will recognize much of its behavior. Whatever the listing says, the cut in YOUR tent is the ground truth: log feedings, readings, and photos, and let the trends — not the label — drive decisions.
Black Unicorn FAQ
How long does Black Unicorn take to flower?
Black Unicorn typically flowers in around 67 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Black Unicorn an indica or a sativa?
Black Unicorn is listed as indica.
What are the parents of Black Unicorn?
Black Unicorn was bred from Purple Unicorn × Black Grapes by Riot Seeds.
What environment does Black Unicorn like?
Standard cannabis bands work well: VPD 0.8–1.1 kPa in veg and 1.0–1.4 kPa in flower, with humidity stepping down from 65–75% as a seedling to 40–50% in late flower. See the stage-by-stage table on this page.
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