G13 Haze by Barney’s Farm is an award-winning sativa legend that is far easier to grow than most haze. From G13 x Hawaiian Sativa, it is a strongly sativa-dominant, feminized photoperiod plant with a euphoric, happy, giggly effect, a peppery, piney, herbal flavor with tropical notes, and a high 22-23% THC. Best of all, it stays a surprisingly manageable 1.35 m and yields big, making a classic haze genuinely practical.
This is a feminized photoperiod strain, not an autoflower, so it flowers when you shorten the light cycle and gives you full control over veg length, training, and cloning. The figures below are Barney’s Farm breeder values; check your own pack for the exact numbers.
Recommended Strains
G13 Haze
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THC | 22% - 23% (Medium) |
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Lineage | G13 x Hawaiian Sativa |
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Type | Feminized |
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Height | 4.43 ft | 1.35 m |
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Yield | High |
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Yield Indoor | 1.8 oz/ft² | 550 g/m² |
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Yield Outdoor | 28.22 oz/plant | 800 g/plant |
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Flowering Time | 9 - 10 weeks |
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Phenotype | 20% Indica / 80% Sativa |
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Effects | Euphoric, Happy, Giggly |
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Flavors | Pepper, Pine, Herbal |
G14 Autoflower
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THC | 21% - 22% (Medium) |
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Lineage | G13 x Auto |
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Type | Autoflowering |
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Height | 3.28 ft | 1 m |
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Yield | High |
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Yield Indoor | 1.31 - 1.64 oz/ft² | 400 - 500 g/m² |
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Life Cycle | 9 - 10 weeks |
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Phenotype | 70% Indica / 30% Sativa |
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Effects | Calming, Hungry, Relaxed, Talkative |
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Flavors | Earthy, Lemon, Sweet, Woody |
G13 Haze Grow Info
| Trait | G13 Haze (Barney’s Farm) |
| Genetics | G13 x Hawaiian Sativa |
| Seed type | Feminized photoperiod |
| Genetic profile | 20% indica / 80% sativa |
| THC | 22-23% (medium-high) |
| Flowering time | 9-10 weeks |
| Height | Around 1.35 m |
| Indoor yield | High, around 550 g/m² |
| Outdoor yield | High, around 800 g per plant |
| Effects | Euphoric, happy, giggly |
| Flavor | Pepper, pine, herbal, tropical |
These are Barney’s Farm’s published figures for the G13 Haze line at Growlantis. When you need an exact THC percentage, height, or yield, check the specification on your own G13 Haze seed pack.
What Makes G13 Haze Worth Growing
G13 Haze is a celebrated, award-winning sativa that solves the usual haze problems. Its mysterious G13 and Hawaiian Sativa heritage delivers a soaring, euphoric, happy, giggly high and a complex peppery, piney, herbal flavor with tropical notes, the kind of top-shelf sativa experience connoisseurs chase, at a solid 22-23% THC.
The surprise is how practical it is. Where most hazes grow tall and flower endlessly, G13 Haze stays a manageable 1.35 m, finishes in a reasonable 9-10 weeks, and yields a high 550 g/m² indoors or up to 800 g per plant outdoors. That mix of elite sativa quality, big yield, and manageable growth is exactly why it has earned its awards.
Is G13 Haze Indica or Sativa?
G13 Haze is strongly sativa dominant, listed at 80% sativa and 20% indica, from G13 and Hawaiian Sativa.
That heavy sativa lean defines the high: soaring, euphoric, happy, and giggly, a clear-headed, sociable, daytime effect rather than a sedative one. The plant keeps some sativa stretch but, thanks to the G13 side and Barney’s selection, stays more compact and manageable than a classic landrace haze. It is an up, energetic strain at heart.
Flowering Time vs Full Grow Time
Because G13 Haze is a photoperiod strain, these two numbers are separate, and mixing them up is the most common planning mistake.
- Flowering time: 9-10 weeks. This is the bloom stage, which starts only when you switch the lights to 12/12 indoors (or when days shorten outdoors). It is quick for a haze.
- Full grow time (seed to harvest): flowering plus however long you veg. Indoors, a typical grow runs around 4.5 to 5 months from seed, depending on veg length.
The practical point: the quicker flower and manageable height make this far easier to schedule than a pure haze. Outdoors, expect to finish around early to mid October.
Does G13 Haze Need a 12/12 Light Cycle?
Yes. G13 Haze is a photoperiod strain, so indoors it needs a 12/12 light cycle (12 hours on, 12 hours off) to start and maintain flowering.
Keep it on a long veg schedule, usually 18/6, for as long as you want it to grow, then flip to 12/12 when it has the size and shape you want. Account for the sativa stretch and flip while it is under your height limit, though it is tamer than most haze. Outdoors, shortening late-summer days trigger flowering naturally.
G13 Haze Grow Timeline, Week by Week
Treat this as a development pattern, not a fixed schedule, since veg length is up to you.
- Weeks 1-2: germination and seedling. The taproot and first true leaves establish. Keep humidity up and feeding minimal.
- Weeks 3-5: vegetative growth (your choice). The plant builds its frame under 18/6. This is when you top and train.
- Week 0 of flower: the flip. Switch to 12/12. Expect a sativa stretch, tamer than a pure haze.
- Weeks 1-4 of flower: stretch and bud set. Vertical growth finishes and flower sites form.
- Weeks 5-8 of flower: bud development. Buds fill out and the peppery, piney aroma deepens.
- Weeks 9-10 of flower: ripening and harvest. Judge by trichomes, not the calendar.
Choosing Your Setup: Space, Light and Pots
G13 Haze’s manageable 1.35 m height is a big advantage for a haze, fitting a standard tent. Account for the sativa stretch and flip to 12/12 while the plant is comfortably under your height limit. Low stress training or a SCROG net keeps the canopy even and pushes the high yield.
Give it strong light for the best sativa buds. A full-spectrum LED at 30-40 watts per square foot over the flowering canopy keeps the buds dense. Add a good inline exhaust fan and a carbon filter, since the peppery, herbal aroma is noticeable in flower.
For pots, 3-5 gallon containers suit most indoor grows, scaled to veg time and plant size. Fabric pots improve root airflow and help prevent overwatering.
Germinating and Raising Seedlings
The paper towel method is the simple, reliable start. Soak the seeds for 12-24 hours, then place them between damp paper towels on a covered plate, kept dark and warm at 70-85°F (21-29°C). A taproot usually appears within two to three days.
When the taproot reaches about 1-2 cm, plant it root-down a knuckle deep in a light mix and keep the surface moist until the seedling emerges. Hold off on nutrients at this stage. New to growing? Our beginner growing guides cover germination step by step.
The Vegetative Stage, Topping and Training
Veg is where you shape a photoperiod plant, and G13 Haze’s vigorous sativa frame responds well to training. Keep it under 18/6 with a nitrogen-rich feed and build a strong, even frame before you flower.
Topping the main stem early encourages multiple colas and a wider, flatter canopy, which helps manage the sativa stretch and spread the high yield. Combine it with low stress training or a SCROG net to expose more bud sites to light. Finish training before the flip. You can also clone a plant you like before flowering to preserve its genetics.
Feeding and Watering G13 Haze
Feed to the stage. Use a nitrogen-forward base through veg, then move to a bloom formula higher in phosphorus and potassium once you flip to 12/12 and buds form. A vigorous, high-yielding sativa handles a solid feed, but start moderate and increase based on how the plant responds rather than overfeeding early.
Water by root-zone moisture, not a timetable. Let the top inch or two of medium dry between waterings, then water thoroughly until a little drains. Fabric pots and this water-to-weight habit keep the roots healthy and prevent overwatering.
Flowering and Knowing When to Harvest
Once you flip to 12/12, expect a sativa stretch, then buds fill out over the 9-10 week bloom. The peppery, piney, herbal, and tropical aroma develops, so keep air moving and run a carbon filter indoors.
Let ripeness, not the calendar, decide the harvest. Check the trichomes under a loupe and cut when most are cloudy, keeping it earlier for the clear, soaring sativa effect. After harvest, hang the branches in the dark at about 60°F (15-16°C) and 55-60% humidity for 7-14 days, then cure in sealed jars, burping daily for the first couple of weeks to protect the complex flavor.
Growing Indoors vs Outdoors
Indoors, G13 Haze rewards control and is far easier than most haze thanks to its manageable height. Hold 18/6 for veg, flip to 12/12, train the canopy even, and the high 550 g/m² yield is very reachable under strong light.
Outdoors, it is a strong performer in a warm, sunny climate, returning a high 800 g per plant and usually finishing around early to mid October. Its manageable size makes it easier to grow than a towering haze. Give it full sun, rich well-draining soil, and airflow around the buds.
How Tall and How Much? Height and Yield
Height is a real selling point. G13 Haze stays around 1.35 m, much shorter than a typical haze, so it fits a standard tent with only a moderate stretch to plan for.
On yield it is a strong producer, listed as high at around 550 g/m² indoors and 800 g per plant outdoors, excellent for a sativa this size. Strong light, a topped or SCROG canopy, and a healthy root zone are what turn that potential into real weight.
Best US Climates for G13 Haze
G13 Haze does best in a warm, sunny climate, so growers in California, the Southwest, and warmer Western and Southern states can comfortably take it to an early-to-mid October finish outdoors. Its quicker 9-10 week flower and manageable size also make it more viable than a pure haze in slightly cooler, shorter-season states.
Its practical height makes it a strong indoor choice anywhere. In the humid Southeast, keep airflow strong around the buds. For more options, browse our full how-to-grow guide library.
Common Problems When Growing G13 Haze
A few predictable issues are easy to head off.
Underestimating the sativa stretch
Even in its manageable form, it stretches after the flip. Flip to 12/12 while it is well under your height limit and train to keep the canopy even.
Weak light limiting the yield
The high yield depends on strong light reaching the whole canopy. Give it enough intensity and open the plant with training, or lower buds stay light.
Harvesting too late for the soaring high
G13 Haze’s signature is a clear, euphoric high. Harvest when trichomes are mostly cloudy rather than letting too many turn amber, which pushes the effect heavier.
Harvesting by the calendar
The 9-10 week window is a guide, not a cutting date. Read the trichomes and pistils before you cut, since phenotype and environment shift the timing.
Making the Most of Your Harvest
Do not waste the trim. The sugar leaves make good bubble hash, dry sift, or infused oil that keeps the peppery, piney character. The stems, roots, and fan leaves compost well and feed your next grow.
Is G13 Haze Right for You?
If you want an award-winning, soaring, euphoric sativa with a complex peppery-piney flavor and big yields, but cannot house a towering haze, yes. Its manageable height and quicker flower make a top sativa genuinely practical. If you want a heavy sedative indica, look elsewhere. Browse our full how-to-grow guide library for more.
Frequently Asked Questions
Is G13 Haze indica or sativa?
G13 Haze is strongly sativa dominant, listed at 80% sativa and 20% indica, from G13 and Hawaiian Sativa. The high is soaring, euphoric, happy, and giggly, a clear-headed, sociable daytime effect. Thanks to the G13 side and Barney’s selection, the plant stays more compact and manageable than a classic landrace haze.
Does G13 Haze need a 12/12 light cycle?
Yes. G13 Haze is a photoperiod strain, so indoors it needs a 12/12 light cycle to start and maintain flowering. Keep it on 18/6 during veg, then flip to 12/12 when sized right. It is tamer than most haze, but still account for the sativa stretch. Outdoors, shortening days trigger flowering.
How long does G13 Haze take to grow?
G13 Haze flowers in 9 to 10 weeks once you switch to 12/12, quick for a haze. Total seed-to-harvest time depends on your veg length, usually around 4.5 to 5 months indoors. Outdoors it finishes around early to mid October. Judge the finish by trichome maturity rather than the calendar.
How much does G13 Haze yield?
G13 Haze is a high yielder for a sativa, at around 550 g/m2 indoors and 800 g per plant outdoors. Its manageable height makes those yields practical in a standard tent. Strong light, a topped or SCROG canopy, and a healthy root zone are what turn that potential into real weight.
How tall does G13 Haze get?
G13 Haze stays around 1.35 m, much shorter than a typical sativa haze, which is a big part of its appeal. Expect a moderate stretch after the flip to 12/12, so flip while it is comfortably under your height limit. Its manageable size makes it one of the easier hazes to grow in a standard tent.
Can you clone G13 Haze?
Yes. As a photoperiod strain, G13 Haze clones well. Take a cutting from a healthy plant in veg, root it, and keep it under 18/6 light. Cloning lets you preserve a plant you like and run repeatable harvests without buying new seeds each time, which autoflowers cannot do.
What does G13 Haze taste like?
G13 Haze has a complex peppery, piney, herbal flavor with tropical notes, a classic, lively haze profile. To protect those terpenes, run a carbon filter in flower, dry slowly at around 60°F with moderate humidity, and cure in sealed jars, burping daily for the first couple of weeks. A careful cure keeps the haze flavor bright.
