Jackie O by Unknown or Legendary
Jackie O, from breeder Unknown or Legendary, is a sativa-leaning strain descended from Jack Flash × Zero Gravity. Indoors it typically finishes flowering in around 74 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Jackie O grows against.
🌿 Start a Jackie O journal — free →
Similar strains
| Breeder | Unknown or Legendary |
|---|---|
| Type | mostly sativa |
| Flowering time | ±74 days |
| Environment | Indoors, Outdoors |
| Lineage | Jack Flash × Zero Gravity |
🌱 Get Jackie O seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Jack Flash · Zero Gravity
Ancestry Pedigree
Sensi Seeds
Sensi Seeds
Sensi Seeds
Original Strains
Sensi Seeds
The Seed Bank
Clone Only Strains
Unknown or Legendary
Original Strains
Original Strains
Sensi Seeds
The Seed Bank
Cultivators Choice
Original Strains
Original Strains
TH Seeds
Clone Only Strains
The Seed Bank
Unknown or Legendary
Original Strains
The Seed Bank
Clone Only Strains
Unknown or Legendary
Original Strains
Original Strains
Growing Jackie O: 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 Flash or Zero Gravity 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.
Jackie O FAQ
How long does Jackie O take to flower?
Jackie O typically flowers in around 74 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Jackie O an indica or a sativa?
Jackie O is listed as mostly sativa.
What are the parents of Jackie O?
Jackie O was bred from Jack Flash × Zero Gravity by Unknown or Legendary.
What environment does Jackie O 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 Jackie O and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Jackie O? 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.