Sour Jack is a sativa-dominant cannabis strain bred from Sour Diesel and Jack Herer, known for a lemon-and-fuel aroma and an energetic, focused head high. Its breeder is not documented, but both parents are classic sativa-leaning strains and the name comes straight from them. Most listings put THC between 16% and 22%, with effects that lean motivating and uplifting.
Sour Jack Strain at a Glance
| Type | Sativa-dominant hybrid |
|---|---|
| Lineage | Sour Diesel × Jack Herer |
| Breeder / origin | Not documented |
| THC | 16–22% (typical lab range) |
| CBD | Under 1% |
| Dominant terpenes | Myrcene, Limonene, Beta-caryophyllene |
| Aroma and flavor | lemon, fuel, pine, sour citrus, menthol, citrus, diesel, sweet, tropical |
| Reported effects | energetic, focused, creative, happy |
| Best for | daytime use, getting things done, creative work, outdoor activity |
| Flowering time | 10–12 weeks |
Where Sour Jack Comes From
Sour Jack is exactly what its name suggests: a cross of Sour Diesel and Jack Herer. Leafly and AllBud agree on that parentage, and both list it as sativa-dominant, with AllBud giving a 70/30 sativa ratio. Neither source credits a breeder, and no seed company has a widely recognized claim to the original cut, so it is best described as a strain of unknown origin with well-known parents.
The pairing joins two of the most influential daytime strains in American cannabis. Sour Diesel is the pungent, fast-hitting East Coast fuel strain, and Jack Herer is the Dutch-bred, piney sativa named after the late hemp activist. AllBud describes Sour Jack as a rare strain, so it can take some looking to find.
Leafly lists Dream ‘n Sour and Sin City Diesel among its offspring.
Sour Jack Effects: What It Feels Like
Sour Jack is a get-up-and-go strain. Leafly’s top reported effects are energetic, focused and creative, and the description emphasizes a burst of energy that pushes back against fatigue. AllBud reviewers describe a clear, peaceful headspace and say it lacks the paranoia some sativas cause. Others call it uplifting and mellow at the same time, with a mild euphoria that makes chores, walks and creative projects feel easier.
It can be stronger than it looks. One Leafly reviewer had to stop after a few hits, and another reported a long, heavy sleep once the high wore off. Both parents can trigger racing thoughts in sensitive users, so start with a single puff and give it fifteen minutes. It suits mornings and early afternoons better than evenings.
Sour Jack Terpenes, Aroma and Flavor
Expect a sharp, sour citrus nose with a fuel undertone from Sour Diesel and a piney, slightly minty edge from Jack Herer. AllBud’s description cites lemon, fuel, menthol and pine, and its aroma tags are citrus, fruity, pungent and sour. On the palate, Leafly and AllBud list citrus, diesel and lemon, with sweet and tropical notes showing on the exhale.
Leafly reports myrcene as the dominant terpene, followed by limonene and caryophyllene. Limonene drives the lemon, caryophyllene adds a peppery bite under the fuel, and myrcene provides the earthy base.
- Myrcene: earthy, musky and herbal, also found in mango and hops
- Limonene: bright citrus, also found in lemon and orange peel
- Beta-caryophyllene: peppery and spicy, also found in black pepper and cloves
Terpene levels vary from grower to grower and batch to batch, so check the lab label on the package. Learn more in our guide to cannabis terpenes.
Side Effects and How to Use Sour Jack
Leafly users report dry mouth, anxiety and headache as the most common negatives. As with most fuel-and-haze sativas, a large dose can feel racy, and a few users report a crash or heavy tiredness when it wears off. Keep the dose small if you are prone to anxiety.
How strong Sour Jack feels depends on the batch, your tolerance and how you consume it. Start low, go slow, and read our guide to dosing cannabis.
Do People Use Sour Jack for Medical Reasons?
Leafly readers most often say they reach for Sour Jack for depression (34%), stress (28%) and anxiety (27%). AllBud lists fatigue, arthritis, chronic pain and migraines among reported uses, and one Leafly reviewer mentioned fibromyalgia pain. These are self-reports from consumers, not medical claims.
These are user reports, not clinical findings. For what research actually supports, see our cannabis health and research section, and talk to your doctor before using cannabis for a health condition.
Growing Sour Jack
- Flowering: 10–12 weeks
Leafly lists a long flowering period of 10 to 12 weeks, which is typical for a strain carrying Sour Diesel and Jack Herer genetics. That long finish matters outdoors: in regions with early fall rain, the plant may still be ripening when the weather turns, so a greenhouse or an indoor run is the safer choice.
Home-grow rules depend on the state: adults can grow at home in states such as California (six plants per residence), Michigan (12 per residence) and Oregon (four per household), while Washington and Illinois allow home growing only for registered medical patients. Check your state in our cannabis laws by state guide before you plant anything.
Strains Like Sour Jack
- Sour Diesel: the fuel-forward parent
- Jack Herer: the piney sativa parent
- Super Lemon Haze: a similar lemony, energizing sativa
- Green Crack: another high-energy daytime choice
- Durban Poison: a clear, motivating sativa
Browse more sativa strains, the full strain directory, or our guide to cannabis strains.
More Sativa Strains to Explore
Sour Lemon · Sour Patch Kiss · Sour Tangie · Sour Haze · Sour Diesel · Sour Candy · All sativa strains
Where to Buy Sour Jack
Dispensary menus change every week, and Sour Jack may be sold under its own name, as a cross or as a pre-roll or vape. The fastest way to find it is to check store menus online before you go. In Detroit, browse Detroit dispensaries and check the menus at stores like Backpack Boyz and Green Genie Cannabis Company. In Chicago, browse Chicago dispensaries and check the menus at stores like Dr Greenthumb’s Chicago and Verilife – Chicago River North. You can also browse licensed dispensaries in every state we cover. Adults 21 and older can buy with a valid photo ID; see cannabis laws by state for purchase limits.
Sour Jack FAQ
Is Sour Jack indica or sativa?
Sour Jack is a sativa-dominant hybrid, listed at about 70% sativa. Its effects are energetic and focused.
What is Sour Jack a cross of?
Sour Diesel and Jack Herer.
How strong is Sour Jack?
Listings range from about 16% to 22% THC. Some reviewers find it stronger than expected.
What does Sour Jack taste like?
Sour lemon and diesel fuel, with pine, a touch of menthol and a sweet, tropical finish.
Who bred Sour Jack?
The breeder is not documented. The strain is known by its parents rather than a specific seed company.
Is Sour Jack good for daytime use?
Yes. Most users find it energizing and clear, which suits mornings and active afternoons.
For adults 21+ in legal states. Strain information reflects breeder descriptions, lab data and user reports; effects vary by person and batch. Not medical advice.