How to Grow Jack Herer
Jack Herer is a legendary, sativa-dominant feminized strain that crosses Haze with Northern Lights #5 and a secret Skunk line. It is a 60/40 sativa with a medium 20% THC, a piney, spicy, herbal flavor with a citrus edge, and a creative, energetic, focused effect. One of the most celebrated sativas of all time, it pairs a clear, functional high with a reliable, rewarding grow.
As a feminized strain, Jack Herer produces only female, flower-bearing plants, so you can skip sexing and remove the guesswork of sorting out males. Every seed goes toward productive, bud-growing plants from the start. You grow it under long days through its vegetative stage, then switch the lights to 12/12 to trigger flowering, which gives you full control over the plant’s final size and its timing.
Recommended Strains
Jack Herer
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THC | 20% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 40% Indica / 60% Sativa |
Jack Herer Auto
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THC | 15% - 20% (Medium) |
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Type | Autoflowering |
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Yield | Medium |
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Phenotype | 40% Indica / 60% Sativa |
Potent, aromatic and beginner-friendly, Jack Herer is a rewarding strain to grow. You can see the full genetics and buy Jack Herer seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | Medium (20%) |
|---|---|
| Lineage | Haze x Northern Lights #5 x secret Skunk |
| Type | Feminized |
| Genetics | 60% Sativa / 40% Indica |
| Climate | Temperate |
| Flowering time | 8-10 weeks |
| Harvest (outdoor) | October |
| Height | 5.25 ft / 1.6 m |
| Yield indoor | 1.97 oz/ft² (600 g/m²) |
| Yield outdoor | 19.4-22.93 oz/plant (550-650 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Pine, Herbal, Spicy, Citrus |
| Effects | Creative, Energetic, Focused |
Promos & Deals
Growing a Feminized Strain
Jack Herer is a photoperiod feminized strain, which means it flowers in response to the light cycle rather than its age. You keep it under long days, usually 18 hours of light, for as long as you want it to grow and build structure, then switch to 12 hours of light and 12 hours of darkness (12/12) to tell the plant to start flowering. Because every seed grows into a female, there are no males to find and remove, so your whole crop goes toward buds.
That control over timing suits a sativa-leaning plant like Jack Herer, which stretches after the flip but stays relatively manageable at around 1.6 m, more compact than many pure sativas. Flip it once it has filled your space, and use the vegetative stage to top and train it. Spreading the canopy opens up the many flowering tops and helps them fatten evenly across its reasonable 8 to 10 week bloom.
Climate and Where to Grow It
Jack Herer suits a temperate climate and grows well both indoors and outdoors where it gets good light and a steady season. Outdoors in the Northern Hemisphere it finishes around October, a sensible timeline for a sativa of its type. At a moderate 1.6 m it is easier to manage than most sativas, fitting comfortably in a tent while still producing heavily.
Its yield is high, around 600 g/m² indoors in an optimized setup and a generous 550-650 g per plant outdoors, impressive for a sativa. As an energetic, uplifting sativa, it is the foundation of our Jack Herer strains, a family of crosses built on this legendary cultivar. Its balanced vigor and reasonable height make it a rewarding grow.
That character comes straight from its parents: a classic Haze lends the soaring, cerebral energy and spicy, piney profile, while Northern Lights brings resin, structure and a faster finish, and a Skunk line adds vigor and depth. Keep temperatures around 68-80°F (20-27°C) and good airflow through flowering so the resinous colas ripen clean.
Feeding Schedule (EC Guide)
Jack Herer is a vigorous, productive plant, so feed it steadily but do not overdo the nitrogen, which sativas can be sensitive to. Start light while it is young, build through the vegetative stage, shift toward phosphorus and potassium once it flips into flower, then flush at the end so the piney, spicy notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.5-0.7 | Very light feed while roots establish |
| Vegetative | 1.0-1.4 | Build nitrogen gently as the plant develops |
| Early flower | 1.3-1.6 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.5-1.8 | 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 flip it to 12/12, Jack Herer finishes in about 8 to 10 weeks, quick for a Haze-influenced sativa thanks to its Northern Lights side. It builds long, resin-coated, spear-shaped colas, developing a piney, spicy, herbal aroma with a bright citrus edge as it ripens. The resin is heavy for a sativa, a sign of the quality that made this strain a classic.
Yields are high at around 600 g/m² indoors and 550-650 g per plant outdoors. Keep the colas supported and the canopy even so light reaches every flowering top, feed it steadily through flower, and harvest when most of the trichomes have turned cloudy for a bright, clear, cerebral effect, or wait for a little amber for a slightly rounder finish.
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 preserves the volatile piney and spicy terpenes that make Jack Herer so aromatic, and a gentle dry protects both that brightness and its fresh, herbal character.
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 locks in the piney, spicy, herbal notes and smooths the smoke, turning a freshly dried harvest into the clean, classic, aromatic result Jack Herer is famous for.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Jack Herer is a resinous plant for a sativa, so its trim is well worth saving for dry sift, bubble hash or rosin. That resin and piney, spicy aroma make the trim genuinely valuable, turning offcuts into a bright, flavorful concentrate run rather than waste, carrying that classic character into your extracts.
Flavor and Terpenes
Jack Herer leads with a piney, spicy, herbal flavor lifted by a bright citrus edge, the clean, complex profile that made it famous. It is a smooth, aromatic smoke with real depth, and a good cure brings that piney-and-spicy character forward in the jar and on the inhale.
Its terpene profile is rich and shapes that flavor. Alpha-pinene drives the fresh, piney top note, while terpinolene and gamma-terpinene add a bright, herbal lift that carries the zesty edge. Eugenol brings a warm, clove-like spice, with delta-3-carene and terpineol rounding out a piney, spicy, herbal character that is distinctly Jack Herer.
Effects and Best Use
With its medium 20% THC and 60/40 sativa-leaning make-up, Jack Herer delivers a bright, clear-headed experience. It is reported as creative, energetic and focused, pairing an uplifting, motivating head with a functional, wide-awake quality, which makes it a classic daytime and creative strain. The balanced potency keeps it productive rather than overwhelming, easy to enjoy while staying active.
That creative, energetic, focused profile makes it a rewarding strain for work, creative projects or an active day, alongside its piney, spicy flavor. The combination of a legendary clear-headed high, heavy resin for a sativa and a manageable, high-yielding grow is exactly why Jack Herer remains one of the most respected feminized strains.
Common Problems and Pro Tips
Jack Herer is forgiving and beginner-friendly, and at a moderate 1.6 m it is one of the easier sativas to manage, but a little stretch after the flip is still worth planning for. Flip it once it has filled your space, top it during veg and spread the canopy so light reaches the many flowering tops evenly across its bloom.
Go a little easy on the nitrogen, since sativas can show burn, and keep the air moving around the resinous colas so they ripen clean. Support the longer branches as the spear-shaped buds fill out, and defoliate a few of the largest fan leaves if the canopy gets crowded so the lower buds get light and airflow.
As a pro tip, protect what makes Jack Herer special, its bright, piney, spicy aroma. Those terpenes are volatile, so avoid excessive heat late in flower, dry it slowly and cool, and give it a full three to four week cure with a proper plain-water flush beforehand. Save the resinous trim for concentrates, and harvest on the cloudy side for the clearest, most cerebral effect.
FAQ
Is Jack Herer a feminized strain?
Yes. Jack Herer is a photoperiod feminized strain, so every seed grows into a female, flower-bearing plant and you never have to sex or remove males. You grow it under long days through the vegetative stage, then switch the lights to 12/12 to trigger flowering, which gives you full control over the plant’s size and when it finishes.
How long does Jack Herer take to flower?
Jack Herer finishes in about 8 to 10 weeks once you switch it to a 12/12 light cycle, which is quick for a Haze-influenced sativa thanks to its Northern Lights side. Outdoors in the Northern Hemisphere it is typically ready to harvest around October. That reasonable timeline is part of why it is such a manageable sativa to grow.
How much THC does Jack Herer have?
Jack Herer is a moderately potent strain, testing around 20% THC depending on the phenotype and how it is grown. Combined with its 60/40 sativa-leaning genetics, the result is a creative, energetic, focused effect. The balanced potency keeps it clear-headed and productive, which is a big part of its enduring, classic appeal.
How much does Jack Herer yield?
Jack Herer is a strong producer, especially for a sativa, giving around 600 g/m² indoors in an optimized setup and a generous 550-650 g per plant outdoors. Give it good light penetration, an even canopy and support for the longer branches to get the most from its resinous, spear-shaped colas across its 8 to 10 week bloom.
What does Jack Herer taste like?
It has a piney, spicy, herbal flavor lifted by a bright citrus edge, the clean, complex profile that made it famous. Alpha-pinene drives the pine, terpinolene and gamma-terpinene a herbal lift, and eugenol a clove-like spice. A proper three to four week cure brings that piney-and-spicy character forward on the inhale.
Is Jack Herer a good daytime strain?
Yes, it is a classic daytime choice. Its creative, energetic, focused effect pairs an uplifting, motivating head with a functional, wide-awake quality, making it well suited to work, creative projects or an active day. The balanced 20% THC keeps it productive rather than overwhelming, so you can stay clear-headed while enjoying it.
