How to Grow Blueberry x Jack Herer Autoflower
Blueberry x Jack Herer Autoflower is a 70% sativa autoflowering strain that pairs a fruity, woody-spicy profile with the speed and simplicity of an auto. Often searched as Blueberry Jack, it runs from seed to harvest in 8–10 weeks regardless of the season, which makes it a relaxed, low-fuss grow.
The strain crosses Blueberry and Jack Herer, then adds Ruderalis to make it autoflowering. From Jack Herer it takes a fresh, spicy, terpinolene-forward character and a sativa structure; from Blueberry it borrows the sweet fruit undertone, while the Ruderalis is what lets it flower on age rather than on a change in light.
Recommended Strains
Blueberry x Jack Herer Auto
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THC | 14% - 18% (Medium) |
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Type | Autoflowering |
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Yield | Low |
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Phenotype | 30% Indica / 70% Sativa |
Black Jack
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THC | 15% - 19% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 55% Indica / 45% Sativa |
Because it flowers automatically and forgives beginner mistakes, it sits among our beginner-friendly options. You can see the full genetics and buy Blueberry x Jack Herer Auto seeds on the strain page, and browse more cuts in the Jack Herer strains collection.
Strain Profile at a Glance
| THC | 14–18% (Medium) |
|---|---|
| Lineage | (Blueberry x Jack Herer) x Ruderalis |
| Type | Autoflowering |
| Genetics | 30% Indica / 70% Sativa |
| Climate | Dry |
| Life cycle | 8–10 weeks (seed to harvest) |
| Harvest | All season |
| Height | 4.92 ft / 1.5 m |
| Yield | Low |
| Yield indoor | 0.56–0.66 oz/ft² (170–200 g/m²) |
| Yield outdoor | 28.22 oz/plant (800 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Fruity, Spicy, Woody |
| Effects | Deeply soothing, happy, relaxed, uplifted |
Promos & Deals
Climate and Where to Grow It
Blueberry x Jack Herer Autoflower is suited to a dry climate, which plays to its strengths: its sativa-leaning, airy buds prefer low humidity and dislike damp, stagnant air. In an arid environment you mostly need to watch that the plant does not dry out too fast rather than worry about mould.
Because it is an autoflower, it does not depend on the season to bloom, so you can run it all year and even squeeze in multiple outdoor cycles where the weather allows. Outdoors a single plant can get surprisingly large for an auto, up to 1.5 m, and in a long, sunny season one plant can reach as much as 800 g.
Indoors, keep temperatures around 68–80°F (20–27°C) and relative humidity on the lower side through flowering. Good airflow and a dry room suit this strain far better than a humid tent.
Autoflower Growing Basics
The single most important thing with any autoflower is that you do not switch the light cycle to trigger flowering. Blueberry x Jack Herer starts to flower on its own at around 3–4 weeks of age, so you run a long day throughout: 18–20 hours of light from seedling to harvest both saves you the flip and keeps the plant feeding.
Start the seed in its final pot. Autos run on a fixed internal clock and resent transplanting, so moving them mid-run costs you growth you can’t get back in a short life cycle. Germinate straight into the container you intend to finish in, and handle the roots as little as possible.
Keep training gentle. With only a few weeks of vegetative growth there is no time to recover from heavy topping, so stick to low-stress training: tuck and tie branches rather than cutting, and the sativa stretch will still fill out a tidy, even canopy.
Feeding Schedule (EC Guide)
Autoflowers are light feeders, so start low and let the plant ask for more. The EC values below map onto the life-cycle stages rather than a separate veg and bloom flip, and because this is a lower-yielding auto there is no benefit to overfeeding.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Weeks 2–4, raise nitrogen gently as it grows |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while buds form |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Life Cycle and Harvest
The full life cycle runs 8–10 weeks from seed to harvest. Because it is an autoflower, you harvest when the plant is ready rather than at a fixed calendar date, so let the trichomes be your guide.
Expect vegetative growth in weeks 1–3, the automatic switch to flower around weeks 3–4, and bud development and resin through to week 8–10. The sativa lean means airy, elongated flowers rather than rock-hard nuggets, which is normal for this type. Harvest when most trichomes have turned cloudy for a bright, uplifting finish, or wait for a little amber if you want it heavier.
Give the plant a 1–2 week plain-water flush before cutting. Since it is an all-season auto, you can time your start date so the finish lands whenever suits you.
Drying and Curing
Dry whole plants or branches in a dark space at around 60°F (15–18°C) and 55–60% humidity for 7–14 days, until the thin stems snap cleanly. A dry climate makes this easy, but watch that the buds don’t crisp too fast; slow is always better.
Then cure the trimmed buds in sealed jars, burping them daily for the first week. Three to four weeks of curing lifts the fruity-woody aroma and smooths the smoke, which matters even more on a lighter-yielding plant where you want every gram to count.
What to Do With Your Trim
Don’t bin the sugar leaves you remove during manicuring. The resinous trim is ideal for dry sift, rosin or infused edibles, so you get extra value from a plant that already yields modestly indoors instead of throwing the offcuts away.
Flavor and Terpenes
Blueberry x Jack Herer tastes fruity and sweet up front with a woody, spicy backbone, the Blueberry fruit riding over the fresh, Jack-Herer-style terpene base. That blueberry note reads as a fruit impression from the lineage rather than from any citrus terpene.
Six terpenes shape the aroma most: terpinolene (fresh, Jack Herer signature lift), alpha-pinene (resinous pine), carene (sharp, woody-piney), terpineol (lilac-pine smoothness), eugenol (clove-like spice) and phellandrene (peppery, minty edge). Behind them sit nerolidol, gamma-terpinene and p-cymene, which round out the woody, slightly herbal depth.
Effects and Best Use
Blueberry x Jack Herer Autoflower is deeply soothing yet happy, relaxed and uplifted, a balanced lift-and-settle character that reflects its mostly-sativa genetics.
Those effects make it a flexible daytime-to-evening option: clear and upbeat enough for company, mellow enough to unwind with. Combined with the fast life cycle and easy care, it is an approachable pick for growers who want a quick, pleasant auto rather than a heavyweight.
Common Problems and Pro Tips
Blueberry x Jack Herer Autoflower is easy to grow, but it is a tall sativa auto that yields far more outdoors, so plan around that.
- Train early and lightly: autos do not recover from hard stress, so use low-stress bending while young and start it in its final pot to avoid transplant shock.
- Give it space outdoors: its indoor yield is modest but a single outdoor plant can reach far more, so this one earns its keep in the ground or a big pot in the sun.
- Light the lower buds: as a 70% sativa it grows tall and open, so spread the branches and give it headroom so the lower buds get enough light to fill out.
Expert tip: it prefers a drier climate, so keep humidity down in flower. A slow cure protects its sweet blueberry fruit over the woody, spicy base.
Frequently Asked Questions
Is Blueberry x Jack Herer indica or sativa?
It is sativa-dominant, at roughly 70% sativa and 30% indica, so the effect leans bright and uplifting with a soothing body side. That sativa lean gives a tall, open structure even as an auto, so give it headroom indoors and spread the branches so the lower buds get light.
How long is the Blueberry x Jack Herer Autoflower life cycle?
About 8 to 10 weeks from seed to harvest. As an autoflower it flowers on age, not on a light change, so the clock does not stop for mistakes, and it can be run all season. Plan your feed and training around that fixed window to get the most from it.
Do I need to change the light cycle for this autoflower?
No. Keep it on a long day of 18 to 20 hours of light from seedling to harvest. It starts flowering on its own at around three to four weeks, so there is no 12/12 flip to perform. A steady, generous light schedule gives this tall auto the energy to fill out.
Is Blueberry x Jack Herer good for beginners?
Yes. It is an easy, forgiving autoflower listed among our beginner-friendly strains. Start it in its final pot to avoid transplant shock and keep any training gentle. It yields far more outdoors than indoors, so give it space in the ground or a big pot in the sun to really shine.
What does Blueberry x Jack Herer taste like?
Expect sweet blueberry fruit over a woody, spicy base, with a peppery edge. That profile comes from its terpinolene, pinene, eugenol and phellandrene. It prefers a drier climate, so keep humidity down, and cure slowly in jars so the fruit and spice hold up rather than fading after harvest.
How much does Blueberry x Jack Herer Autoflower yield?
Indoors it is a modest producer at 0.56 to 0.66 oz/ft² (170 to 200 g/m²), but a single outdoor plant in a long, sunny season can reach up to 28.22 oz (800 g). Give it space, light and a dry finish outdoors and it rewards you far beyond its indoor numbers.
