Galactic Jack by SubCool
1 other breeder's version of Galactic Jack — compare flowering times side by side →
Galactic Jack is a sativa-leaning cannabis strain from SubCool, bred by crossing Jack Herer × Space Queen. Indoors it typically finishes flowering in around 65 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Galactic Jack grows against.
🌿 Start a Galactic Jack journal — free →
Similar strains
| Breeder | SubCool |
|---|---|
| Type | mostly sativa |
| Flowering time | ±65 days |
| Environment | Outdoors |
| Lineage | Jack Herer × Space Queen |
🌱 Get Galactic Jack seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Jack Herer · Space Queen
Ancestry Pedigree
Sensi Seeds
The Seed Bank
Original Strains
Cultivators Choice
Unknown or Legendary
Original Strains
Original Strains
Original Strains
Original Strains
BC Growers Association
Unknown or Legendary
Original Strains
Brothers Grimm
Unknown or Legendary
Sensi Seeds
Original Strains
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Sensi Seeds
Growing Galactic 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 Jack Herer or Space Queen 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.
Galactic Jack FAQ
How long does Galactic Jack take to flower?
Galactic Jack typically flowers in around 65 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Galactic Jack an indica or a sativa?
Galactic Jack is listed as mostly sativa.
What are the parents of Galactic Jack?
Galactic Jack was bred from Jack Herer × Space Queen by SubCool.
What environment does Galactic 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 Galactic Jack and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Galactic 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.