Critical Jack Autoflowering by Growers Choice
Critical Jack Autoflowering is an autoflowering cannabis strain from Growers Choice, bred by crossing Critical Jack × Ruderalis. Indoors it typically finishes flowering in around 70 days from sprout. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Critical Jack Autoflowering grows against.
🌿 Start a Critical Jack Autoflowering journal — free →
Similar strains
| Breeder | Growers Choice |
|---|---|
| Type | ruderalis/indica/sativa |
| Flowering time | ±70 days |
| Environment | Outdoors, Greenhouse |
| Lineage | Critical Jack × Ruderalis |
🌱 Get Critical Jack Autoflowering seeds →
Affiliate link — supports Cultivar at no cost to you.
Autoflower note: runs on age, not light schedule — see the week-by-week autoflower schedule.
🧬 Explore the family: Critical Jack · Ruderalis
Ancestry Pedigree
Dinafem
Dinafem
Clone Only Strains
Mr Nice Seedbank
Original Strains
The Seed Bank
Cultivators Choice
Original Strains
Original Strains
Original Strains
Sensi Seeds
The Seed Bank
Original Strains
Cultivators Choice
Unknown or Legendary
Original Strains
Original Strains
Original Strains
Original Strains
Original Strains
Growing Critical Jack Autoflowering: what to expect
Because Critical Jack Autoflowering is an autoflower it runs on age, not photoperiod: keep it under 18–20 hours of light from sprout to harvest, start in its final pot, and go easy on training after week 3 — autos never pause to recover. Growers familiar with Critical Jack or Ruderalis 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.
Critical Jack Autoflowering FAQ
How long does Critical Jack Autoflowering take to flower?
Critical Jack Autoflowering typically flowers in around 70 days from sprout (autoflower — no light-schedule flip needed). Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Critical Jack Autoflowering an indica or a sativa?
Critical Jack Autoflowering is listed as ruderalis/indica/sativa (autoflowering).
What are the parents of Critical Jack Autoflowering?
Critical Jack Autoflowering was bred from Critical Jack × Ruderalis by Growers Choice.
What environment does Critical Jack Autoflowering 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 Critical Jack Autoflowering and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Critical Jack Autoflowering? 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.