The award-winning sativa legend bred by Sensi Seeds in 1994. Named after cannabis activist Jack Herer — 7+ Cannabis Cup wins, terpinolene-dominant, 18–23% THC.
Jack Herer was created by Ben Dronkers at Sensi Seeds in Amsterdam around 1994, with the explicit goal of combining the resin production of NL#5, the vigour of Shiva Skunk, and the cerebral effect profile of classic Haze. The result was a near-hybrid with sativa-dominant phenotype expression.
The strain was named after Jack Herer, the American cannabis activist who wrote The Emperor Wears No Clothes in 1985 — a book arguing that hemp prohibition was driven by petrochemical and timber industry lobbying rather than public health concerns. Herer corresponded with Sensi Seeds and gave his blessing to the naming.
| Parent | Type | Key Trait Contributed |
|---|---|---|
| Northern Lights #5 | Indica | Resin production, compact structure, resilience |
| Shiva Skunk | NL#5 × Skunk #1 | Vigour, yield, pungent aroma base |
| Haze | Pure Sativa | Cerebral effect, terpinolene terpene profile, long flower |
Because Sensi Seeds never disclosed the exact backcross ratios, several phenotypes exist in the market — some lean more indica with a shorter flower time, others express more strongly sativa with a longer stretch. The original "A" phenotype is the most prized for competition use.
Jack Herer is one of a small group of strains where terpinolene is the dominant terpene — a characteristic shared with Durban Poison, Ghost Train Haze, and Dutch Treat. Research (Russo, 2011; Steep Hill Labs data 2017) associates terpinolene-dominant profiles with uplifting, socially engaging effects and reduced sedation.
| Terpene | Avg % | Aroma Notes | Effect Association |
|---|---|---|---|
| Terpinolene | 0.52% | Piney, floral, herbal | Uplifting, energising |
| Ocimene | 0.28% | Sweet, herbal, citrus | Anti-inflammatory (preclinical) |
| Caryophyllene | 0.19% | Spicy, pepper, woody | CB2 agonist, stress modulation |
| Myrcene | 0.14% | Earthy, musky, mango | Mild sedation at high levels |
| Pinene | 0.09% | Sharp pine | Memory retention (preclinical) |
| Strain | THC | Type | Terpinolene % | Flower Time |
|---|---|---|---|---|
| Jack Herer | 18–23% | Sativa 55/45 | ~0.52% | 7–10 wks |
| Durban Poison | 15–20% | Pure Sativa | ~0.45% | 8–9 wks |
| Ghost Train Haze | 20–27% | Sativa-dom | ~0.60% | 10–11 wks |
| Dutch Treat | 18–22% | Hybrid | ~0.38% | 7–8 wks |
Users commonly report jack herer as producing a clear-headed, creative, and conversation-friendly high. It is rarely associated with couch-lock at standard doses. The balanced hybrid genetics mean the body remains comfortable while the mind stays alert — a profile that explains its historical popularity as a daytime medical strain in the Netherlands.
Jack Herer is classified as intermediate difficulty. The main challenge is managing vertical stretch during the first 3 weeks of flower — plants can double in height. Indoor growers should flip to 12/12 when plants reach 40–50% of the desired final height.
| Parameter | Indoor | Outdoor |
|---|---|---|
| Flower time | 50–70 days | Mid-October harvest |
| Yield | 400–550 g/m² | 500–700 g/plant |
| Plant height | 90–150 cm (trained) | 180–250 cm |
| Temp range | 20–26°C day | Temperate climate |
| Humidity (flower) | 40–50% RH | Low humidity preferred |
| Training | LST or topping at node 4 | Minimal needed |
| Difficulty | Intermediate — stretch management key | |
Jack Herer is resistant to powdery mildew and performs well in hydroponic setups. The resinous buds are dense enough to be susceptible to bud rot in high humidity — keep airflow strong and relative humidity below 50% during flower. Flushing 10–14 days before harvest improves the terpene expression in the final product.
Jack Herer holds a unique dual status in cannabis: it is both a high-profile recreational strain and a government-approved medical product. The Dutch Office for Medicinal Cannabis (OMC) licensed a Jack Herer-derived cultivar for pharmacy dispensing under the Bedrocan brand — a rare distinction confirming its quality at pharmaceutical standards.
| Year | Recognition | Category |
|---|---|---|
| 1994 | Bred by Sensi Seeds, Amsterdam | Origin |
| 1994–2000 | 7× High Times Cannabis Cup wins | Best Sativa / Best Overall |
| 2001 | Dutch Office for Medicinal Cannabis approval | Medical (Bedrocan) |
| 2004 | Emerald Cup — Heritage strain recognition | Legacy |
| 2010 | Jack Herer (activist) passes; strain renamed at many events in tribute | Tribute |
| Ongoing | Worldwide seed bank availability — 500+ licensed phenotypes | Genetics |
Cannabis Cup judging data (reported in High Times 1994–2000) consistently rated Jack Herer highest on aroma and effect profile among sativa-dominant entries. Its 7 consecutive wins in the 1990s — before most modern strains existed — cement it as a historically significant cultivar.