Jack Herer Strain Feminized SeedsSensi's award-winning Haze hybrid, female plants only
4.80 out of 5 · 5 reviewsThe Jack Herer strain is the Haze, Northern Lights and Skunk hybrid that Sensi Seeds released in 1994, famous for a peppery pine-and-citrus smell and a clear, upbeat high. These feminized seeds grow only female plants, so every seedling can go on to flower. Most Jack Herer plants are sativa-leaning, need about 9 to 10 weeks of bloom, and stretch well beyond their pre-flower height.
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What is the Jack Herer strain?
Jack Herer is a sativa-leaning hybrid (about 55% sativa) from Sensi Seeds, released in 1994 and generally traced to Haze, Northern Lights #5 and a Skunk line. It is named after the hemp campaigner and author Jack Herer and is known for a peppery, piney, citrus aroma and an energetic, clear head high. Feminized Jack Herer flowers in about 50 to 70 days depending on the phenotype, and most plants at least double in height after the switch to 12/12.
Ratio from SeedFinder. Sensi itself calls the feminized line a 50/50 hybrid, and AllBud lists it as mostly sativa.
Most Jack Herer plants grow tall and sativa-like, but a rarer compact, indica-leaning type finishes weeks sooner.
Jack Herer strain specs
The Jack Herer figures come from Sensi Seeds, the original breeder, plus SeedFinder, AllBud and Weedmaps. Sensi's own feminized grow report adds one real indoor plant's height, yield and timing, which we quote as a single example, not an average.
| Type | Sativa-leaning hybrid: about 55% sativa (SeedFinder); Sensi says 50/50 |
|---|---|
| Genetics | Haze × Northern Lights #5 × Skunk (often Shiva Skunk); Sensi keeps the exact recipe private |
| Bred by | Sensi Seeds, Amsterdam, released in 1994 |
| THC | Database range about 15–26%; one Sensi feminized test plant measured 26.9% |
| CBD | Low; no breeder figure |
| Main terpenes | Terpinolene, caryophyllene, myrcene, pinene |
| Aroma & flavor | Pine, black pepper, citrus peel, earthy spice, hash and a hint of cinnamon |
| Reported effects | Energetic, clear-headed, creative, focused, upbeat |
| Seed type | Feminized photoperiod (female plants) |
|---|---|
| Flowering indoors | 50–70 days; Sensi's page allows up to 10–12 weeks for the most sativa plants |
| Outdoor harvest | October in warm, sunny regions; struggles where autumn turns cold and wet early |
| Height | Tall: plants gain 75–150% or more after the flip; outdoors up to about 1.8 m (6 ft) |
| Yield | Heavy, per Sensi; their test plant gave 80 g (2.8 oz) from a 5 L pot |
| Difficulty | Moderate; not ideal as a first grow |
| Best methods | SCROG, SOG, supercropping, lollipopping |
| Climate | Indoors, or a Mediterranean-type climate with a long, warm summer |
Where does the Jack Herer strain come from?
Jack Herer was created by Sensi Seeds in the Netherlands and launched in 1994, and it is usually described as Haze crossed with a Northern Lights #5 and Skunk hybrid. Sensi has never published the exact recipe. SeedFinder notes the common Skunk #1, Northern Lights #5 and Haze explanation and also a High Times version, Haze × [NL5 × (NL5 × Skunk #1)], while Sensi's own feminized grow report names Shiva Skunk as the Skunk parent.
The strain honors Jack Herer, the American activist whose book The Emperor Wears No Clothes argued for hemp. Sensi's Jack Herer went on to win many harvest-festival prizes; SeedFinder lists first places at the High Times Cannabis Cup in 1994 and 1999 and at the Highlife Cup in 2003. Today's feminized seeds come from female-only breeding of this line, which is why the same mix of phenotypes still shows up.
What are the Jack Herer phenotypes?
Jack Herer seeds usually produce two main shapes of plant: tall, sativa-dominant phenotypes and a less common short, indica-dominant one. Sensi says most plants are sativa-leaning in growth while flowering and making resin like an indica, and these need the longest bloom, up to 10–12 weeks. The compact indica type can finish in about 8 weeks. SeedFinder lists three known phenotypes, two of them stretched and slow, one short and fast.
Feminized seeds remove only the males, not the variety. Expect different heights and finishing times in the same room, and leave space for the tallest plant.
What is the Jack Herer flavor and high like?
Aroma and flavor
Jack Herer tastes and smells of fresh pine and black pepper with a bright citrus-peel edge, plus earthy spice; Sensi describes dried buds with a sharp, savory hash tone and fruity skunk notes.
- Pine
- Black pepper
- Citrus peel
- Earthy spice
- Hash
- Skunk
Terpenes
- Terpinolene
- Fresh, piney-herbal top note; the lead terpene in Sensi's test
- Caryophyllene
- The black-pepper spice
- Myrcene
- Earthy, slightly fruity base
- Pinene
- Sharp pine resin
Jack Herer phenotypes differ in smell: some are more citrus and pine, others more hashy and skunky.
Reported effects
Jack Herer is best known for a clear, energetic, cerebral high with a lighter body buzz behind it. Sensi describes it as high-energy and long-lasting, and users on AllBud and Weedmaps most often mention feeling upbeat, creative and focused, which makes it a common daytime pick.
- Energetic
- Clear-headed
- Creative
- Focused
- Upbeat
Commonly reported Jack Herer downsides are dry mouth and dry eyes, and some people feel jittery or get racing thoughts after larger amounts.
This Jack Herer summary draws on Sensi's description and user reviews on AllBud and Weedmaps. Reactions vary from person to person, and nothing here is medical advice.
How do you grow Jack Herer seeds?
Feminized Jack Herer seeds suit growers with some experience: keep the vegetative stage short, train the plants flat before they stretch, and allow 50 to 70 days of flowering depending on phenotype. Indoors is the safest choice; outdoors it needs a long, warm, sunny season.
- GerminateAbout 1 week
Every Jack Herer feminized seed should become a female, so you can germinate exactly the number of plants you have room for.
- Vegetate3–5 weeks indoors
Keep veg short. Sensi's own test plant was flipped at only 19 cm after about three weeks and still finished at 95 cm.
- Flower50–70 days
Expect Jack Herer to double in height in the first weeks of 12/12; tuck growth under a SCROG net while it stretches.
- HarvestWeek 8 to 10 · October outdoors
Indica-type plants may be ready around week 8; sativa-type plants often want the full 10 weeks or more.
Grow tips for Jack Herer
- Flip early to control height. Because Jack Herer gains 75–150% or more in bloom, start 12/12 at about a third of your usable height.
- Use a screen. SCROG keeps Jack Herer's long sativa branches level and turns its stretch into extra bud sites under the light.
- Expect an easy smell early, a strong one late. Sensi notes Jack Herer smells little while growing, but its grow report says the room smelled strongly near harvest, so have a carbon filter ready.
- Don't overfeed. Sensi's grower kept pH near 6.2 and raised EC slowly from 1.3 to about 1.8 through the run.
- Sort plants by phenotype. Group the faster, compact Jack Herer plants together so the slower sativa types can finish without holding up the rest.
- Outdoors, pick a hot site. Sensi recommends Jack Herer outdoors only in warm, sunny climates with a long summer, such as Mediterranean regions.
Is Jack Herer the right strain for you?
Great pick if you
- Want a famous, award-winning classic with a peppery pine flavor
- Prefer an energetic, clear daytime high
- Grow indoors with room for stretch, or have a long, hot summer
- Like SCROG and training to shape tall plants
Think twice if you
- Have a very short tent and no time for training
- Want a heavy, sleepy indica for late nights
- Need a fast, uniform crop where every plant finishes the same day
- Live where autumn turns cold and wet early
Jack Herer strain FAQ
Is Jack Herer indica or sativa?
Jack Herer is a sativa-leaning hybrid. SeedFinder lists it at about 55% sativa and 45% indica, while Sensi Seeds calls its feminized line a 50/50 hybrid. Most plants grow and feel like a sativa, with a clear and energetic high.
Who bred the Jack Herer strain?
Sensi Seeds in the Netherlands bred Jack Herer and released it in 1994. The strain is named after Jack Herer, the hemp activist and author of The Emperor Wears No Clothes.
What are Jack Herer's genetics?
Jack Herer is usually described as Haze crossed with a Northern Lights #5 and Skunk hybrid, often given as Shiva Skunk. Sensi Seeds keeps the exact breeding recipe private, and High Times has suggested Haze × [NL5 × (NL5 × Skunk #1)].
How long does Jack Herer take to flower?
Feminized Jack Herer flowers in about 50 to 70 days after the light change to 12/12, depending on the phenotype. Sensi Seeds says the most sativa plants may need 10 to 12 weeks. Its own feminized test plant finished in 70 days, or 91 days from seed.
How much THC does Jack Herer have?
Strain databases put Jack Herer at roughly 15–26% THC (AllBud lower, Weedmaps higher), with low CBD. Sensi's feminized test plant measured 26.9% THC in a third-party lab, but that is one plant, not an average for every seed.
How tall does Jack Herer get?
Jack Herer is a tall plant that stretches hard in flower; Sensi says plants can grow 75–150% beyond their pre-flower height. Sensi's indoor test plant went from 19 cm at the flip to 95 cm at harvest. Outdoor plants can reach about 1.8 m (6 ft).
Does Jack Herer have a strong smell while growing?
Jack Herer smells fairly little through most of its growth, according to Sensi Seeds, but the aroma rises sharply in late flower. Sensi's grow report notes a strong smell near harvest, so plan on a carbon filter indoors.
What does Jack Herer taste like?
Jack Herer tastes of pine and black pepper with citrus peel, earthy spice and, on some plants, a savory hash note. Terpinolene, caryophyllene and myrcene led the terpene test on Sensi's feminized plant.
What is the difference between feminized and regular Jack Herer seeds?
Feminized Jack Herer seeds grow female plants, so there is no need to find and remove males. Regular Jack Herer seeds grow both sexes and are mainly chosen by breeders. The genetics, flavor and phenotype spread are otherwise the same line.
Jack Herer reviews
4.80 out of 5 from 5 reviews
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5 reviews for Jack Herer Strain Feminized Marijuana Seeds
Jack Herer's relatives and similar strains
Jack Herer Regular
Jack Herer Autoflowering Feminized
Northern Lights Feminized
Critical Jack 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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Dennis Molen –
When Jack Herer is growing outside, it truly displays its height! When harvest time came, she had given me a very substantial product, which I like. She has developed large buds and lengthy leaves. I particularly adore this strain’s resistance to mildew, mold, and pests. I respect how much resin it produces and how much of a calming recreational effect it has on my body and mind! It tastes and smells more earthy, sweet, and orange—like a rich dessert.
James Odie –
Jack Herer was the right marijuana strain for me since it covers a wide range of medical effects that can help me treat my mental and physical issues. Its scent and tastes more sweet, orange, and earthy that is like an expansive dessert. I admire the extreme resin production of it and the recreational effects that is more on relaxing my body and mind!
Harold Dryden –
Jack Herer really shows off its height when grown outdoors! She has develops a large buds and long leaves; when the harvest time arrives she had given me a very large product which I appreciate. When I was drying and curing her;; she emits a very strong piney, sweet, earthy, and tropical scent that stays in the air all over the room. And when I consume this strain it offers me a powerful mind buzz that could somehow take away my negative thoughts, it also very helpful with my migraine and stress from work.
Greg Dennis –
DAMN! the effects took me off right away! I feel my body very lightweight like I’m floating in the air! And provides medical relief from the symptoms of depression and can soothe away stress and anxieties and reduce pain. I also love how Jack Herer is resilient from pests, molds, and mildews.
Kristopher Dixon –
It thrived well during its flowering phase, while its buds are a vibrant green that wraps in trichomes. As I inhale the smoke, I can taste flowers and fruity flavors that blast inside my mouth. After few hours, I feel a constant high that relaxed and put me into sleep quickly.