Runtz Strain Autoflower SeedsZkittlez × Gelato candy genetics on a quick ruderalis clock
No reviews yet · be the first to review RuntzThe Runtz strain is the candy-sweet Zkittlez × Gelato hybrid from Los Angeles that Leafly named its 2020 Strain of the Year. This autoflower version adds ruderalis genetics, so Runtz plants bloom on their own without a light change and are typically ready about 9 to 10 weeks from seed. Expect compact plants around 60 to 100 cm (2 to 3.3 ft), a fruity, sugary aroma and a balanced, euphoric effect.
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What is the Runtz strain?
Runtz is a balanced hybrid of Zkittlez and Gelato, created in Los Angeles around Cookies and the Runtz crew and named Leafly's Strain of the Year in 2020; this autoflowering version crosses it with ruderalis so it flowers without a light change. Autoflower Runtz listings put the full cycle at about 9 to 10 weeks from seed, plant height around 60 to 100 cm and THC at up to roughly 23%. The photoperiod Runtz has been reported at 19–29% THC; the auto usually lands lower. It keeps the parent's sweet, fruity candy aroma and its happy, relaxed effect.
Split from Zamnesia's Runtz Auto listing on SeedFinder; the ruderalis share is not counted, and some seed lines lean slightly indica.
Auto Runtz keeps the sugary fruit aroma of photoperiod Runtz while finishing the whole cycle in about 9 to 10 weeks.
Runtz strain specs
Runtz autoflower seeds are sold by several seed companies, so these numbers mix autoflower listings (Zamnesia on SeedFinder, MSNL) with Leafly and Weedmaps data for the photoperiod parent. The autoflower figures are breeders' claims, not lab results, and THC for the photoperiod Runtz is given separately.
| Type | Autoflowering hybrid, about 50/50 indica-sativa plus ruderalis |
|---|---|
| Genetics | Runtz (Zkittlez × Gelato) × Ruderalis |
| Bred by | Runtz created in Los Angeles by the Runtz crew with Cookies genetics; auto by several seed banks |
| THC | Auto listings: up to about 23–24%; photoperiod Runtz reported at 19–29% |
| CBD | Low |
| Main terpenes | Caryophyllene, limonene, linalool |
| Aroma & flavor | Sugary fruit candy, tropical fruit, cream, light earth |
| Reported effects | Euphoric, happy, relaxed, tingly |
| Seed type | Autoflower, feminized (female plants) |
|---|---|
| Seed to harvest | About 9–10 weeks (roughly 70 days) |
| Outdoor harvest | About 10 weeks after sowing; several runs per season possible |
| Height | About 60–100 cm indoors (2–3.3 ft), up to ~120 cm outdoors |
| Yield | About 400–500 g/m² indoors; 70–150 g per plant outdoors |
| Difficulty | Easy to moderate |
| Best methods | Final pot from day one, gentle LST, 18/6 or 20/4 light |
| Climate | Indoors, or outdoors in any warm stretch of about 10 weeks |
Where does the Runtz strain come from?
Runtz began in Los Angeles as a cross of Zkittlez and Gelato, and this autoflower version adds Cannabis ruderalis so the plant flowers by age instead of day length. Weedmaps credits Ray Bama and his partner Nick with combining Cookies' Gelato with Dying Breed Seeds' Zkittlez, while Leafly links the cross to Cookies; most accounts agree on the two parents. Runtz became one of the most hyped strains of the late 2010s and was Leafly's 2020 Strain of the Year.
The original Runtz was released as a brand and clone, not as seeds, so autoflower Runtz seeds are seed banks' own recreations: a Runtz-type photoperiod plant crossed with ruderalis and stabilized over several generations. That means auto Runtz from different breeders can vary in height, timing and flavor, and none of them is the original LA cut.
How is Runtz autoflower different from feminized Runtz?
Runtz autoflower flowers on its own and is usually done about 9 to 10 weeks after the seed sprouts, while feminized Runtz needs a 12/12 light schedule to bloom and a longer total grow. The auto is also smaller, around 60 to 100 cm, which suits small tents, balconies and quick outdoor runs. In return, autoflower Runtz generally yields less per plant and is listed with somewhat lower THC than the photoperiod version.
No vegetative control. With Runtz autoflower you can't extend the veg stage to grow a bigger plant. Any stress or transplant shock in the first weeks costs final size, so plan the grow before you sow.
What does Runtz taste like, and how does it feel?
Aroma and flavor
Runtz has a sweet, fruit-candy flavor, sugary, tropical fruit sweetness with creamy undertones from the Gelato side and a light earthy finish.
- Fruit candy
- Sugary
- Tropical fruit
- Creamy
- Grape
- Earthy
Terpenes
- Caryophyllene
- Warm pepper; Leafly ranks it first among Runtz samples
- Limonene
- Citrus brightness on top of the candy
- Linalool
- Soft, floral sweetness
This Runtz terpene trio comes from Leafly's data for the photoperiod strain; autoflower phenotypes may differ.
Reported effects
Runtz is reported to start with a euphoric, happy lift and ease into a calm, relaxed body feel without heavy couch-lock. Zamnesia describes its autoflower as a full mind-and-body effect that stays uplifting, which makes it popular for relaxed afternoons or evenings.
- Euphoric
- Happy
- Relaxed
- Tingly
- Uplifted
People mention cottonmouth and dry eyes most with Runtz, and its potency can bring on racing thoughts for those with low tolerance.
Runtz's effect summary draws on Leafly's strain data and seed-company notes for the autoflower version. Experiences differ between people, and nothing here is medical advice.
How do you grow Runtz seeds?
Runtz autoflower seeds are easy to moderate to grow: sow each one where it will finish, give it 18 to 20 hours of light daily, train gently, and harvest about 9 to 10 weeks after germination.
- GerminateDays 1–7
Plant Runtz autoflower seeds directly into the container they will finish in, since transplanting wastes precious early days.
- Early growthWeeks 2–4
Runtz auto builds its frame fast. Start soft low-stress training now; skip topping, which stresses a plant with no time to recover.
- FlowerWeeks 4–9
Buds form on their own with no change to the light cycle. The candy aroma gets strong from about week 6.
- HarvestAbout 9–10 weeks from seed
Harvest Runtz when most trichomes look cloudy; some amber gives a more relaxed effect.
Grow tips for Runtz
- Keep the light on long. Runtz autoflower flowers without 12/12, so a long 18/6 or 20/4 day across the whole grow makes the most of its short life.
- Feed lighter than a photoperiod. Small autoflowers like Runtz burn easily. Use about half to three quarters of a full-strength feed schedule and watch leaf tips.
- Bend, don't cut. Gentle LST spreads Runtz's branches for more even bud sites without the stall that high-stress training can cause.
- Mind the smell. The sweet Runtz aroma carries in late flower, so use a carbon filter indoors even with only one or two plants.
- Fit in extra outdoor runs. Because Runtz autoflower finishes in about 10 weeks, outdoor growers in the US and Canada can often fit two sowings into one warm season.
Is Runtz the right strain for you?
Great pick if you
- Want famous Runtz candy flavor with a fast turnaround
- Grow in a small tent, closet or balcony
- Prefer not to manage a 12/12 light switch
- Want a balanced, happy effect for later in the day
Think twice if you
- Want the biggest possible yield per plant
- Want to clone a keeper (autoflower clones flower right away too)
- Expect the exact original LA Runtz cut
- Like heavy topping and long training sessions
Runtz strain FAQ
Is Runtz indica or sativa?
Runtz is a balanced hybrid. Zamnesia's autoflower listing puts it at about 50% indica and 50% sativa plus ruderalis, and some seed lines lean slightly indica. Users describe a mix of happy head effects and calm body relaxation.
What two strains make Runtz?
Runtz is a cross of Zkittlez and Gelato, two award-winning California strains. This autoflower version adds ruderalis genetics on top of that Zkittlez × Gelato base so the plant flowers by itself.
Who created Runtz?
Runtz was created in Los Angeles. Weedmaps credits Ray Bama and his partner Nick with crossing Cookies' Gelato and Dying Breed Seeds' Zkittlez, while Leafly links Runtz to Cookies. Autoflower Runtz seeds are later recreations by seed banks.
How long does Runtz autoflower take from seed to harvest?
Runtz autoflower is usually ready about 9 to 10 weeks from seed, or roughly 70 days. It begins flowering on its own a few weeks after sprouting, with no need to change the light schedule.
How tall does Runtz autoflower grow?
Runtz autoflower usually reaches about 60 to 100 cm (2 to 3.3 ft) indoors and up to about 120 cm outdoors, according to seed-company listings. That compact size suits small tents and balconies.
How much THC does Runtz autoflower have?
Autoflower Runtz listings give THC up to around 23–24%. The photoperiod Runtz has been reported at 19–29% THC. Actual results depend on the seed line, growing conditions and when you harvest.
How much does Runtz autoflower yield?
Breeders list Runtz autoflower at roughly 400–500 g/m² indoors and about 70–150 g per plant outdoors. Good light, a large final pot and no stress in the first weeks matter most for hitting the top of that range.
Why did Runtz win Strain of the Year?
Leafly named Runtz its 2020 Strain of the Year because of its huge popularity and cultural reach, from its candy-like flavor to its place in music and dispensary culture. Its parent Gelato had won the same title in 2018.
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Runtz's family and other candy strains
Runtz Feminized
Zkittlez Feminized
Gelato Autoflowering Feminized
White Runtz Autoflowering FeminizedBeaver Seeds sells cannabis seeds for collection and genetic preservation where permitted. Check the laws in your state, province or country before germinating seeds. Effects are user-reported and are not medical claims.
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