Viper by Reeferman
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Viper, from breeder Reeferman, is a sativa-leaning strain descended from Burmese Pure × Blackseed. 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 Viper grows against.
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Similar strains
| Breeder | Reeferman |
|---|---|
| Type | mostly sativa |
| Flowering time | ±70 days |
| Environment | Outdoors |
| Lineage | Burmese Pure × Blackseed |
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🧬 Explore the family: Burmese Pure · Blackseed
Ancestry Pedigree
Reefermans Seeds
Original Strains
Reefermans Seeds
Original Strains
Growing Viper: what to expect
As a sativa-leaning plant, plan for a big stretch after the flip (often 100–200%) — flip earlier than feels natural and keep training options ready. Sativa-leaning plants also generally prefer a lighter feed than heavy indicas. Growers familiar with Burmese Pure or Blackseed 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.
Viper FAQ
How long does Viper take to flower?
Viper 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 Viper an indica or a sativa?
Viper is listed as mostly sativa.
What are the parents of Viper?
Viper was bred from Burmese Pure × Blackseed by Reeferman.
What environment does Viper 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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