Gamma Jack by Seattle Chronic Seeds
Gamma Jack is a sativa-leaning cannabis strain from Seattle Chronic Seeds, bred by crossing CBD MediHaze × Jack Herer. Indoors it typically finishes flowering in around 66 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Gamma Jack grows against.
🌿 Start a Gamma Jack journal — free →
Similar strains
| Breeder | Seattle Chronic Seeds |
|---|---|
| Type | mostly sativa |
| Flowering time | ±66 days |
| Environment | Outdoors, Greenhouse |
| Lineage | CBD MediHaze × Jack Herer |
🌱 Get Gamma Jack seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: CBD MediHaze · Jack Herer
Ancestry Pedigree
CBD Crew
Mr Nice Seedbank
Green House Seeds
Cultivators Choice
Unknown or Legendary
Original Strains
Original Strains
Original Strains
Original Strains
Cultivators Choice
Original Strains
Original Strains
Sensi Seeds
The Seed Bank
The Seed Bank
The Seed Bank
The Seed Bank
Cultivators Choice
Growing Gamma Jack: 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 CBD MediHaze or Jack Herer 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.
Gamma Jack FAQ
How long does Gamma Jack take to flower?
Gamma Jack typically flowers in around 66 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Gamma Jack an indica or a sativa?
Gamma Jack is listed as mostly sativa.
What are the parents of Gamma Jack?
Gamma Jack was bred from CBD MediHaze × Jack Herer by Seattle Chronic Seeds.
What environment does Gamma Jack 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.
📷 Growing Gamma Jack and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Gamma Jack? A structured journal — with your feedings, readings, and photos — is how you find what THIS cut actually wants.
Track your own grow free — the journal grades your environment against these bands →
Get the one-page grow reference card
VPD, pH by medium, deficiency symptoms and dry/cure targets on a single printable page. Free — plus the occasional grow-data breakdown. No spam, unsubscribe in one click.