Runt-Zu by Grateful Seeds
Bred by Grateful Seeds from Runtz × Key Lime Pie, Runt-Zu is an indica-leaning cannabis variety. Indoors it typically finishes flowering in around 63 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Runt-Zu grows against.
🌿 Start a Runt-Zu journal — free →
Similar strains
| Breeder | Grateful Seeds |
|---|---|
| Type | indica/sativa |
| Flowering time | ±63 days |
| Environment | Outdoors |
| Lineage | Runtz × Key Lime Pie |
🌱 Get Runt-Zu seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Runtz · Key Lime Pie
Ancestry Pedigree
Unknown or Legendary
Dying Breed Seeds
Apothecary Genetics
Unknown or Legendary
Clone Only Strains
Original Strains
The Seed Bank
Original Strains
Clone Only Strains
Unknown or Legendary
Unknown or Legendary
Original Strains
Original Strains
Original Strains
Unknown or Legendary
Sherbinskis
Unknown or Legendary
Clone Only Strains
Clone Only Strains
Unknown or Legendary
Clone Only Strains
Original Strains
Original Strains
Clone Only Strains
Clone Only Strains
Unknown or Legendary
Clone Only Strains
Dutch Passion
Unknown or Legendary
Original Strains
Unknown or Legendary
Unknown or Legendary
Original Strains
Purple Caper Seeds
Clone Only Strains
Purple Caper Seeds
Clone Only Strains
Clone Only Strains
Growing Runt-Zu: what to expect
As an indica-leaning plant, expect a modest stretch after the flip (roughly 50–100%) and dense bud structure — which makes late-flower humidity discipline the main risk: keep RH in the 40s once buds fatten to stay ahead of mold. Growers familiar with Runtz or Key Lime Pie 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.
Runt-Zu FAQ
How long does Runt-Zu take to flower?
Runt-Zu typically flowers in around 63 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Runt-Zu an indica or a sativa?
Runt-Zu is listed as indica/sativa.
What are the parents of Runt-Zu?
Runt-Zu was bred from Runtz × Key Lime Pie by Grateful Seeds.
What environment does Runt-Zu 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 Runt-Zu and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Runt-Zu? 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.