Français Runtz is a cross of Gelato and Zkittlez, a balanced hybrid with a sweet, fruity flavour and up to 27% THC. Breeders have since crossed it into many variations. This guide compares the seven Runtz strains we sell.
Runtz strain guide
Which Runtz finishes when, outdoors
For a Canadian grower, the harvest date is what separates these strains.
See Runtz seeds
Late September to early OctoberThe earliest three
Early October
Mid-OctoberNeeds a mild fall
Harvest dates as listed on each QCS product page.
The seven Runtz strains at a glance
| Strain | Genetics | Type | Flowering | Outdoor harvest | THC |
|---|---|---|---|---|---|
| Runtz | Gelato × Zkittlez | Balanced hybrid | 8 to 9 weeks | Late September to early October | Up to 27% |
| White Runtz | Zkittlez × Gelato | Hybrid | 7 to 8 weeks | Late September to early October | 25 to 29% |
| Black Runtz | Black Diamond Sherbet × Runtz | 70% indica, 30% sativa | 8 to 9 weeks | Late September to early October | 30 to 32% |
| Blackberry Runtz | Runtz Cake × Blackberry Kush | Hybrid | 8 to 9 weeks | Early October | Around 25% |
| Mint Runtz | Kush Mintz × Runtz | Balanced hybrid | 8 to 10 weeks | Mid-October | 19 to 22% |
| Lemon Runtz | Lemon × Runtz | Hybrid | 9 to 10 weeks | Mid-October | 23 to 28% |
| Runtz Autoflower | Zkittlez × Gelato #33 | Autoflower, 50% indica, 50% sativa | 7 to 9 weeks | Does not depend on the season | Up to 29% |
A note on the numbers in this article: harvest dates, flowering times and yields are ranges, not promises. They vary depending on growing conditions: the grower, the method and the season's weather. "Mold resistant" means mold tolerant: less prone to mold and slower to be affected. No strain is 100% mold resistant. How we set these numbers →
Which Runtz should you grow?
For the original: Runtz, the Gelato and Zkittlez cross the others are built on.
For the fastest finish: White Runtz flowers in 7 to 8 weeks, the shortest of the photoperiod Runtz strains, with 25 to 29% THC.
For the highest THC: Black Runtz, at 30 to 32%. It is 70% indica and easy to grow. The effect is deeply relaxing, with a euphoric, mood-lifting start.
For a berry flavour: Blackberry Runtz. It starts as bright berry candy and deepens with curing into a rich berry-cream Kush.
For the biggest outdoor plant: Lemon Runtz, with up to 1,000 g per plant outdoors. It needs the longest season of the seven.
For a milder Runtz: Mint Runtz, at 19 to 22% THC, and easy to grow.
For a first grow or a short season: Runtz Autoflower. It flowers on its own, is easy to grow and reaches up to 29% THC.
Where to start
Three Runtz, three reasons
Growing Runtz outdoors in Canada
The harvest date is what separates these strains for a Canadian grower. Runtz, White Runtz and Black Runtz are ready from late September to early October. Blackberry Runtz follows in early October. Mint Runtz and Lemon Runtz need until mid-October.
October brings night frosts, and a late plant has to resist mould. If your season is short, choose one of the three earliest, or grow Runtz Autoflower. Keep Mint Runtz and Lemon Runtz for gardens where fall stays mild, or grow them indoors.
For more early strains, see our September harvest seeds.
Outdoors in Canada
Pick your Runtz by its harvest date
Runtz, White Runtz and Black Runtz are ready from late September. Mint Runtz and Lemon Runtz need until mid-October, so keep them for a mild fall or grow them indoors.
Common questions
What is Runtz a cross of? Gelato and Zkittlez.
Is Runtz indica or sativa? Runtz is a balanced hybrid. Black Runtz leans indica, at 70%.
Which Runtz has the most THC? Black Runtz, at 30 to 32%, followed by White Runtz and Runtz Autoflower at up to 29%.
How long does Runtz take to flower? 8 to 9 weeks indoors. Outdoors it is ready from late September to early October.
How much does Runtz yield? Up to 500 g/m² indoors and up to 500 g per plant outdoors.
