Gemma Arterton by Riot Seeds
Growers reach for Gemma Arterton as a sativa-leaning option, a cross of Trainwreck × Sweet Pink Grapefruit out of Riot Seeds. Indoors it typically finishes flowering in around 70 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Gemma Arterton grows against.
🌿 Start a Gemma Arterton journal — free →
Similar strains
| Breeder | Riot Seeds |
|---|---|
| Type | mostly sativa |
| Flowering time | ±70 days |
| Environment | Outdoors, Greenhouse |
| Lineage | Trainwreck × Sweet Pink Grapefruit |
🌱 Get Gemma Arterton seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Trainwreck · Sweet Pink Grapefruit
Ancestry Pedigree
Clone Only Strains
Original Strains
Spice of Life Seeds
Clone Only Strains
Original Strains
Original Strains
Growing Gemma Arterton: 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 Trainwreck or Sweet Pink Grapefruit 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.
Gemma Arterton FAQ
How long does Gemma Arterton take to flower?
Gemma Arterton typically flowers in around 70 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Gemma Arterton an indica or a sativa?
Gemma Arterton is listed as mostly sativa.
What are the parents of Gemma Arterton?
Gemma Arterton was bred from Trainwreck × Sweet Pink Grapefruit by Riot Seeds.
What environment does Gemma Arterton 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 Gemma Arterton and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Gemma Arterton? 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.