Critical Blue Auto by Expert Seeds
Critical Blue Auto is an autoflowering cannabis strain from Expert Seeds, bred by crossing Blueberry × Critical Plus Automatic. Indoors it typically finishes flowering in around 70 days from sprout. Reported THC is 18%. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Critical Blue Auto grows against.
🌿 Start a Critical Blue Auto journal — free →
Similar strains
| Breeder | Expert Seeds |
|---|---|
| Type | ruderalis/indica/sativa |
| Flowering time | ±70 days |
| THC | 18% |
| Environment | Outdoors, Greenhouse |
| Lineage | Blueberry × Critical Plus Automatic |
🌱 Get Critical Blue Auto 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: Blueberry
Ancestry Pedigree
DJ Short
Unknown or Legendary
DJ Short
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Original Strains
Unknown or Legendary
Original Strains
Unknown or Legendary
Original Strains
Unknown or Legendary
Original Strains
Unknown or Legendary
Dinafem
Dinafem
Clone Only Strains
Mr Nice Seedbank
Original Strains
The Seed Bank
Cultivators Choice
Original Strains
Original Strains
Original Strains
Dinafem
Joint Doctor
Super Sativa Seed Club
Original Strains
The Seed Bank
Unknown or Legendary
Original Strains
Original Strains
Unknown or Legendary
Original Strains
Growing Critical Blue Auto: what to expect
Because Critical Blue Auto 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 Blueberry or Critical Plus Automatic 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 Blue Auto FAQ
How long does Critical Blue Auto take to flower?
Critical Blue Auto 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 Blue Auto an indica or a sativa?
Critical Blue Auto is listed as ruderalis/indica/sativa (autoflowering).
What are the parents of Critical Blue Auto?
Critical Blue Auto was bred from Blueberry × Critical Plus Automatic by Expert Seeds.
How strong is Critical Blue Auto?
Reported THC for Critical Blue Auto is 18%. Actual potency depends heavily on environment, harvest ripeness, and cure quality.
What environment does Critical Blue Auto 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 Blue Auto and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Critical Blue Auto? 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.