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Lemon Jack Auto
Balanced and easy to browse, with a uplifting profile.
Great for indoor & outdoor grows and beginners alike.
Price range: 15 $ through 112 $
Lemon Jack Seeds reads as a feminized autoflower strain with an uplifting profile, indoor & outdoor flexibility, and a medium plant size. The low yield profile and easy grow style make the strain easy to size up. It remains a straightforward option if you’re weighing strength, grow style, and day-to-day usability.
Medium and sturdy—ideal for small spaces and new growers.
Known for a uplifting experience many enjoy.
(Lemon Haze x Jack Herer) x Keepers Ruderalis with stable, reliable results.
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Bright Citrus Character in an Uplifting Autoflower
Citrus lovers, this is for you! The masterpiece that is Lemon Jack combines Lemon Haze, Jack Herer, and Keepers Ruderalis to create a beautiful Sativa dominant autoflower. This cross brings together two classic citrus families, all packed into a little bundle that won’t keep you waiting, as it doesn't need a light cycle to begin flowering. These feminized seeds are perfect for cultivators looking for an energetic strain with a zesty lemon scent and a no-fuss growing process.
Seedkeepers lists CPI at 18-20% and a negligible CBD content. This places Lemon Jack in the moderate+ category as opposed to the extreme end of the scale. Described effects are ‘uplifting’ although each individual may respond differently, so it would be wise to start low when trying out this strain for the first time.
Lemon Haze meets Jack Herer
Lemon Haze provides a crisp lemony scent, while Jack Herer complements with herbal spice, dry wood, and pine. Keepers Ruderalis brings the automatic flowering genetics while maintaining a balanced structure.
The fresh lemon is the most dominant aroma, but handling the bud may cause sweet citrus and mild fruits to reveal themselves along with some spicy pepper and woody earth. All growers acquainted with Haze and Jack genetics will have no trouble identifying the family resemblance.
During flower, Seedkeepers describes dense resin production. The citrus aroma alongside pine, herbs, and spice becomes stronger. A proper dry and cure are essential to maintain the volatile lemon notes that are often lost through excessive heat.
An Automatic Growth Cycle that is Super Simple
Lemon Jack is an autoflower and feminized strain. Plants are set to develop as females and start flowering based on the specific age of the plant. Indoor growers do not have to switch to a 12/12 light schedule. Seedkeepers recommends this strain as easy and suitable for beginner, intermediate, and expert growers.
The estimated height for this strain is about 47.2 inches, and this is true for both indoor and outdoor growing. This height works for most tents, patios, and smaller garden spaces and allows room for a branched structure. Final size can be affected by phenotypes, container sizes, light intensity, climate, and overall plant health.
With auto flowering plants, consistency is key, and early on these plants will start to develop a strong root system. Use a light and airy growth medium, and if you intend to have this plant in a container, put it in its final container early on to prevent any unnecessary root bound conditions, transplanting, heavy pruning, or abrupt environmental changes. Consider gentle branch manipulation to open the canopy as this can facilitate a more rapid recovery.
Lemon Jack grows best in a controlled indoor environment as steady lights and air movement will allow for more even growth. Just be sure to not cover any flowering sites. Allowing adequate time and space for your plants to develop will often be more beneficial than over feeding to encourage rapid growth. Watch the plants and adjust feedings based on the health of the leaves and overall growth rate rather than relying on a strict schedule.
Low yield, compact auto flowers, such as this strain, are best understood as more of a flavorful plant than a high production variety. Seedkeepers has classified this strain as low yield, yet they have estimated indoor production at 1.1 to 1.3 ounces per square foot. This rating is based on the compact automatic structure of the plant.
Outdoor Cultivation
Lemon Jack should be placed with full, direct sunlight, good drainage, and good air circulation. Seedkeepers lists the same height of 47.2 inches and 2.1 to 2.8 ounces per plant. Actual harvests are affected by weather, nutrition, root space, early start quality, pest pressure, and of course weather.
When a traditional growing season is short, or if multiple, staggered runs can be done, the automatic cycle is a good option. Dense flower formations are still at risk of rain and humidity and should be monitored. Sheltered spots can provide protection, just make sure they don’t block light or trap humid air.
An Uplifting, Citrus-Led Experience
The positive description matches with the background that Lemon Jack has. At 18% to 20% THC, the flower may seem more approachable than ultra-high-potency options, but it still deserves responsible handling. Tolerance, serving size, setting, harvest timing, and method of consumption can all impact your experience.
Who Should Pick Lemon Jack?
Select Lemon Jack for Lemon Haze and Jack Herer character in a feminized autoflower. It provides simplicity in growing and allows for indoor or outdoor cultivation, along with an overall height of approximately 47.2 inches. It has dense resin and a distinctly clear citrus and spice profile.
This strain particularly suits growers who appreciate a lesser-threshold schedule and a prominent, unique flavor more than a record-breaking harvest.
| Pack size | 1 seed, 10+4 seeds, 3+1 seeds, 5+2 seeds |
|---|---|
| Seed type | Feminized |
| Light cycle | Autoflower |
| THC | Medium (10–20%) |
| CBD | Low (0–1%) |
| Difficulty | Easy |
| Suitable for | Beginner, Experienced, Intermediate |
| Effect | Uplifting |
| Grow location | Indoor & Outdoor |
| Height | Medium |
| Yield | Low |
| Genetics | (Lemon Haze x Jack Herer) x Keepers Ruderalis |
| Genetics type | Sativa-dominant |







