Blackjack by Nirvana
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Blackjack lands on the indica-leaning side of the spectrum, Nirvana's take on the Black Domino × Jock Horror line. Indoors it typically finishes flowering in around 70 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Blackjack grows against.
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Similar strains
| Breeder | Nirvana |
|---|---|
| Type | indica/sativa |
| Flowering time | ±70 days |
| Environment | Outdoors |
| Lineage | Black Domino × Jock Horror |
| Descendants | Black Jack Automatic, The Bern |
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🧬 Explore the family: Black Domino · Jock Horror · Black Jack Automatic · The Bern
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Growing Blackjack: 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 Black Domino or Jock Horror 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.
Blackjack FAQ
How long does Blackjack take to flower?
Blackjack typically flowers in around 70 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Blackjack an indica or a sativa?
Blackjack is listed as indica/sativa.
What are the parents of Blackjack?
Blackjack was bred from Black Domino × Jock Horror by Nirvana.
What environment does Blackjack 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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