Headrush is Karma doing what Karma does best: taking real American sour-leaning muscle and turning it into something you can actually hunt with. Chem91 on one side, Headbanger on the other—two lines with reputations that don’t need marketing, just honest runs and a careful eye.
This cross sits in that familiar Chem/OG/Banger territory where the room tells the story before the jar does. Not a novelty profile—more like a clean, traceable nod to modern loudness that still respects lineage and selection.
Genetics & release context
Chem91 × Headbanger
Photoperiod feminized release.
This is a “same family tree” pairing: fuel, sour funk, and hard structure. Expect individuals that can lean either way, with enough range to justify a proper selection run.
Chem family context: Chem D, Chem Sister & the Chem ’91 backbone
Within the Chemdog family, Chem D, Chem’s Sister, and especially Chem ’91 are the cuts that defined the line for growers who care about provenance. Chem ’91 in particular is often treated as the core reference point—sharp, fuel-forward, and structurally consistent. A big part of why it still exists in a credible form today is the preservation work credited to SkunkVA, a long-time holder of the verified Chem ’91 cut who kept it alive through the years and helped carry it forward into the modern era. If you’re building around that lane, explore our Lucky Dog Seed Co (SkunkVA) category here: /lucky-dog-seed-co.
What to expect from a run (9–11 weeks)
The 9–11 week window is real. Some phenos finish earlier with a sharper, cleaner punch; others want the full term to stack density and deepen the heavier, lingering side. This is the kind of pack where patience isn’t optional if you want the full expression.
Yield is listed as medium, which usually means the quality-to-plant ratio is the point. Don’t treat it like a numbers-only producer—treat it like a pack you run to keep something.
Grow notes (breeder-style, no hype)
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Flowering time: 9–11 weeks (pheno dependent)
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Stretch: typical of Chem/OG-influenced hybrids — plan your canopy
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Feeding: responds best to a steady program; don’t chase it with excess late flower
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Selection: run enough to see the range; keep standards tight if you’re hunting
For who (growers / collectors)
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Growers chasing authentic Chem/Headbanger lineage without fairy tales
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Collectors who want traceable Karma work in feminized photoperiod format
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Anyone building a room around fuel/sour direction and needing real selection potential
Shipping, authenticity & trust
Why this release earns its place
At Old School Genetics we don’t “curate” with marketing language—we select releases that make genetic and practical sense. Headrush earns its place because it’s built from two proven pillars (Chem91 and Headbanger) with a clear purpose: structure + selection range in a format you can run seriously.
Authorized Karma Genetics distributor & international shipping
Old School Genetics is an authorized distributor with a direct relationship and long-time collaboration history with Karma Genetics. We also ship to USA and handle international orders with the consistency experienced growers expect—clean provenance, no grey-market supply.
FAQ · Headrush (Karma Genetics)
What’s the genetic cross?
Chem91 × Headbanger.
Is it feminized or regular?
Photoperiod feminized.
How long is flowering?
Approximately 9–11 weeks, depending on phenotype and environment.
What yield should I expect?
Listed as medium—the focus here is quality and selection potential, not headline weight.
Is this a novelty “new profile” cross?
No. It’s rooted in proven US fuel/sour lines, framed for growers who value lineage and selection.
Is Old School Genetics an authorized Karma Genetics distributor?
Yes—authorized distribution with direct provenance.
Do you ship to the USA and internationally?
Yes—USA & worldwide.
