How to Grow Runtz
Runtz is a famous, award-winning feminized hybrid that crosses Gelato with Z OG. A multiple cup winner, including the Emerald Cup and Spannabis, it is a perfectly balanced 50/50 plant with a moderate 19-22% THC, a sweet, citrus and earthy flavor, and a happy, focused and relaxed effect. Frosty, flavourful and easy to grow, it is a modern classic that stays beginner-friendly.
This is a feminized photoperiod hybrid of around 1.5 m that flowers in 8 to 10 weeks once you switch it to bloom. Every seed grows into a flowering female, so there is no need to identify the sex or remove males, which keeps the grow simple from start to finish. Its Gelato and Z OG roots give it a sturdy, resinous structure, a sweet, fruity-citrus profile and dense, colourful buds.
Recommended Strains
Runtz
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THC | 19% - 22% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 50% Indica / 50% Sativa |
Runtz Autoflower
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THC | 18% - 22% (Medium) |
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Type | Autoflowering |
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Yield | High |
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Phenotype | 55% Indica / 45% Sativa |
Sweet, frosty and a true crowd-pleaser, Runtz is a rewarding way to grow an award-winning, balanced hybrid. You can see the full genetics and buy Runtz seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | Medium (19-22%) |
|---|---|
| Lineage | Gelato x Z OG |
| Awards | Emerald Cup 2019, Spannabis 2023 & 2024 |
| Type | Feminized (photoperiod) |
| Genetics | 50% Indica / 50% Sativa |
| Climate | Temperate, warm |
| Flowering time | 8-10 weeks |
| Harvest (outdoor) | October |
| Height | 4.92 ft / 1.5 m |
| Yield indoor | 1.31-1.47 oz/ft² (400-450 g/m²) |
| Yield outdoor | 17.64-21.16 oz/plant (500-600 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Citrus, Sweet, Earthy |
| Effects | Happy, Focused, Relaxed |
Promos & Deals
Growing a Feminized Photoperiod Strain
Runtz is a photoperiod strain, so it flowers in response to the light cycle rather than on age. You grow it under a long day of around 18 hours of light while it builds size and structure, then switch to a 12/12 light schedule to trigger flowering, which runs 8 to 10 weeks from the flip to harvest. Because the seeds are feminized, every plant comes up female and goes on to flower, so you never have to check the sex or cull males.
That control over the light cycle is one reason it suits first-time growers, and Runtz is a well-known beginner’s hybrid. You decide how long to veg the plant and therefore how big it gets before you flip it, which lets you match it to your space. As a balanced 50/50 hybrid of about 1.5 m it grows with an even, manageable structure, so give it an open canopy and a little low-stress training to spread the light across its resinous frame.
Climate and Where to Grow It
Runtz does well in a warm, temperate or Mediterranean-style climate with plenty of sun, steady warmth and good airflow. Its Gelato and Z OG heritage makes it a resinous, adaptable plant, and outdoors it suits a season that lets its sticky, colourful buds ripen fully and finish by around October.
It performs well indoors and out. Indoors it returns a solid 400-450 g/m² in a well-managed tent, while outdoors a healthy plant with room and sun gives 500-600 g. As a balanced hybrid of about 1.5 m it stays manageable in height, so the main job is keeping the canopy open so light and air reach the lower buds. Cooler nights late in flower can help coax out the colour its Z OG side is known for.
Keep humidity under control through flowering to protect the dense, resinous colas: around 55-60% in early bloom, nearer 40-45% as the buds fill out, and lower toward harvest. Sweet, sticky buds can hold moisture inside, so steady airflow and sensible humidity keep the finish clean. Aim for daytime temperatures around 72-82°F (22-28°C), which this warm-climate plant enjoys.
Feeding Schedule (EC Guide)
Runtz is a steady, productive feeder, but it still pays to build nutrients up gradually and let the plant set the pace. Feed it steadily through veg and bloom, then taper off for the final flush so the sweet, citrus flavor comes through clean and the smoke finishes smooth. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish |
| Vegetative growth | 0.8-1.2 | Raise nitrogen as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once you switch Runtz to a 12/12 light schedule it flowers in 8 to 10 weeks, rewarding patience with dense, resinous, colourful buds. As a balanced hybrid it fills out with solid, frosty colas up a moderate frame rather than stretching tall, often with purple and pastel hues from its Z OG side. Grown outdoors in a warm climate it is typically ready to harvest around October, once the trichomes have turned mostly cloudy.
Yields are solid: around 400-450 g/m² indoors and 500-600 g per plant outdoors with good sun and space. Give it a little training so the lower buds get light, feed it well through bloom, and harvest when most of the trichomes have turned cloudy for the fullest sweet, citrus flavor and the best of its moderate potency.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry is important with such a resinous hybrid, because its sticky, dense buds can stay damp in the middle while the outside dries, and a gentle dry protects both the aroma and the trichomes.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the sweet, citrus and earthy notes and smooths the smoke, which matters on a Gelato and Z OG cross where that bright, fruity character is the main attraction.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Runtz is a very resinous, trichome-heavy plant, so its trim works especially well for dry sift, bubble hash or rosin. It makes for a sweet, citrus-forward concentrate run from material most growers would otherwise throw away, a nice bonus from a frosty, flavourful hybrid.
Flavor and Terpenes
Runtz is built around a sweet, fruity character with a bright citrus lift and a soft, earthy base. It is a cheerful, fruity-citrus flavor rather than a gassy one, and a good cure really brings that sweet-and-citrus character forward in the jar and on the inhale.
Its terpene profile shapes that character. Limonene drives the bright, citrus lift that defines the aroma, while caryophyllene adds a warm, peppery spice that ties into the earthy undertone. Alpha-pinene and beta-pinene bring a fresh, clean edge, and terpinolene rounds it out with a sweet, fresh lift. Together they frame the citrus, sweet and earthy character Runtz is known for.
Effects and Best Use
With its moderate 19-22% THC and perfectly balanced 50/50 make-up, Runtz delivers a bright, well-rounded experience. It is reported as happy, focused and relaxed, so it balances an upbeat, clear-headed lift with an easy, settled body, making it versatile from the afternoon into the evening. Its moderate potency makes it approachable and easy to enjoy.
That happy, relaxed profile makes it a versatile all-rounder, well suited to staying productive, unwinding or simply enjoying its sweet, citrus flavor. The combination of an easy, award-winning grow, a solid yield and a frosty, flavourful harvest, all at an approachable potency, is exactly why it stands out.
Common Problems and Pro Tips
The most common issue with a resinous hybrid like Runtz is moisture getting trapped in the dense, sticky buds late in flower. Keep the air moving around and through the canopy, hold humidity down as the flowers fill out, and don’t let the plant sit in still, damp air. Defoliating a few of the largest fan leaves in mid-bloom helps light and air reach the lower buds.
Because it is a balanced, even plant, train it lightly for the best results. A little low-stress training or a light topping in veg opens the canopy and turns one dominant cola into several even ones, which suits its structure and lifts the yield. Cooler nights late in flower help bring out the purple and pastel colours from its Z OG side.
As a pro tip, protect the sweet, citrus flavor with a clean plain-water flush at the end and a full three to four week cure, which brings that bright character to its best. It is a forgiving, beginner-friendly plant, so lean on simple habits (steady feeding, good airflow and patience at harvest) rather than anything advanced.
FAQ
Is Runtz a feminized strain?
Yes. Runtz is a feminized photoperiod strain, so every seed grows into a flowering female and you never have to identify the sex or remove males. You grow it under long days, then switch to a 12/12 light schedule to start flowering. That keeps the whole crop productive and makes the grow more straightforward, which is part of why it is such a popular beginner’s hybrid.
How much THC does Runtz have?
Runtz has a moderate THC of around 19-22%, which makes it approachable rather than overwhelming. Combined with its balanced 50/50 genetics, the result is a happy, focused and relaxed effect that works from the afternoon into the evening. That moderate potency makes it an easy, well-rounded strain to enjoy without overdoing it.
How long does Runtz take to flower?
Runtz flowers in about 8 to 10 weeks once you switch it to a 12/12 light schedule, rewarding patience with dense, resinous, colourful buds. As a photoperiod strain you also control how long it vegetates beforehand, so you can size it to your space. Outdoors in a warm climate it is usually ready to harvest around October.
What does Runtz taste like?
Runtz has a sweet, fruity flavor with a bright citrus lift and a soft, earthy base. Limonene drives the citrus lift, caryophyllene adds a peppery spice and earthy undertone, the pinenes a fresh edge, and terpinolene a sweet lift. A proper three to four week cure really brings that sweet-and-citrus character forward.
How much does Runtz yield?
Runtz is a solid producer, giving around 400-450 g/m² indoors and 500-600 g per plant outdoors with good sun and space. Results depend on light, pot size and canopy health, so keep the plant well fed through bloom, train it lightly for an even canopy, and support the resinous colas as they develop toward harvest.
Is Runtz good for beginners?
Yes. Runtz is a well-known beginner’s strain: it is balanced and manageable at around 1.5 m, feminized so there is no sexing, and forgiving as long as you keep the air moving and the feeding steady. Its award-winning pedigree and frosty, flavourful harvest make it a confidence-building choice for a first grow.
