Mr. Jack Mass by Mr. Hide
Growers reach for Mr. Jack Mass as a sativa-leaning option, a cross of Cinderella 99 × Critical Mass out of Mr. Hide. 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 Mr. Jack Mass grows against.
🌿 Start a Mr. Jack Mass journal — free →
Similar strains
| Breeder | Mr. Hide |
|---|---|
| Type | mostly sativa |
| Flowering time | ±65 days |
| Environment | Outdoors |
| Lineage | Cinderella 99 × Critical Mass |
🌱 Get Mr. Jack Mass seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Cinderella 99 · Critical Mass
Ancestry Pedigree
Brothers Grimm
Unknown or Legendary
Sensi Seeds
The Seed Bank
Original Strains
Cultivators Choice
Unknown or Legendary
Original Strains
Original Strains
Original Strains
Original Strains
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
Mr Nice Seedbank
Original Strains
The Seed Bank
Growing Mr. Jack Mass: 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 Cinderella 99 or Critical Mass 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.
Mr. Jack Mass FAQ
How long does Mr. Jack Mass take to flower?
Mr. Jack Mass 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 Mr. Jack Mass an indica or a sativa?
Mr. Jack Mass is listed as mostly sativa.
What are the parents of Mr. Jack Mass?
Mr. Jack Mass was bred from Cinderella 99 × Critical Mass by Mr. Hide.
What environment does Mr. Jack Mass 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 Mr. Jack Mass and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Mr. Jack Mass? 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.