How to Grow Blueberry Autoflower
Blueberry Auto is the autoflowering version of the legendary Blueberry, crossed with a ruderalis so it flowers on age. It is an 80/20 indica with a medium 17-23% THC, a sweet, berry and fruity flavor, and a happy, relaxed, talkative effect. Compact, colorful and easy, it brings Blueberry’s famous fruit and blue-purple hues to a quick, beginner-friendly auto grow.
As an autoflowering strain, Blueberry Auto flowers automatically with age rather than waiting on a change in the light cycle, so there is no need to switch it to shorter days. You simply give it long days from start to finish and it starts flowering on its own after a few weeks, running its whole life cycle in about 8 to 10 weeks from seed to harvest. That speed and simplicity are exactly what make autos so easy to grow.
Recommended Strains
Blueberry Autoflower
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THC | 17% - 23% (Medium) |
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Type | Autoflowering |
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Yield | Low |
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Phenotype | 80% Indica / 20% Sativa |
Blueberry Regular
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THC | 22% - 24% (High) |
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Type | Regular |
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Yield | High |
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Phenotype | 80% Indica / 20% Sativa |
Sweet, colorful and compact, Blueberry Auto is a rewarding auto to grow whether you are new to it or experienced. You can see the full genetics and buy Blueberry Auto seeds on the strain page, and browse the rest of our autoflowering seeds alongside it.
Strain Profile at a Glance
| THC | Medium (17-23%) |
|---|---|
| Lineage | Blueberry x Ruderalis |
| Type | Autoflowering |
| Genetics | 80% Indica / 20% Sativa |
| Climate | Warm, tropical or Mediterranean |
| Life cycle | 8-10 weeks seed to harvest |
| Harvest (outdoor) | All season |
| Height | 3.28 ft / 1 m |
| Yield indoor | 1.15 oz/ft² (350 g/m²) |
| Yield outdoor | 1.76-4.23 oz/plant (50-120 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Berry, Fruity, Sweet |
| Effects | Happy, Relaxed, Talkative |
Promos & Deals
Growing an Autoflowering Strain
Blueberry Auto flowers on its own schedule, starting to bloom a few weeks after it sprouts no matter how long the days are. That means you keep it under long light the whole way through, typically 18 hours on and 6 off, or even 20/4, from seedling right to harvest; there is no switch to a shorter day to trigger flowering. The trade-off is that you cannot delay flowering to grow the plant bigger first, so every week of healthy early growth counts.
Because autos grow fast and do not like having their roots disturbed, start Blueberry Auto in its final pot rather than transplanting it. Sow the seed straight into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. With a short life cycle of around 8 to 10 weeks from seed to harvest, a smooth start is the single biggest thing you can do for a strong, even finish.
Climate and Where to Grow It
Blueberry Auto is happiest in a warm, sunny climate, whether tropical or Mediterranean, and, like most autos, it is flexible about when you plant it. Because it flowers on age rather than on the season, you can run it at almost any time where the weather is warm enough, which is why its harvest window is listed as all season; outdoors you can even fit in more than one cycle in a long, warm year. At a compact 1 m it slips easily into a small tent or a sunny corner.
Yields are modest, around 350 g/m² indoors and 50-120 g per plant outdoors, so this is a strain grown more for its famous flavor, color and easy character than for sheer bulk. As a compact, forgiving indica it is very easy to grow, and it stands alongside other blueberry-lineage autos like Northern Lights x Blueberry Auto in our range.
Keep humidity sensible through flowering to protect the buds: around 55-60% early on, nearer 40% as the flowers fill out, and lower toward harvest. Tight colas can trap moisture inside, so steady airflow through the canopy keeps the finish clean. Aim for temperatures around 70-82°F (21-28°C), and let the nights cool a little late in flower to coax out the blue and purple tones Blueberry is famous for.
Feeding Schedule (EC Guide)
Blueberry Auto is a small, easy auto, and autos want a lighter hand than photoperiod plants, so keep the feed modest and build slowly. Start very light, raise it gently as the plant grows, push a little more phosphorus and potassium through flower, then flush at the end so the sweet, berry notes come through clean. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish in the final pot |
| Early growth | 0.8-1.2 | Raise nitrogen gently as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Blueberry Auto starts flowering a few weeks from sprouting and runs its whole cycle in about 8 to 10 weeks from seed to harvest, with no change in the light cycle needed. It fills out with resin-coated, trichome-frosted buds on a compact frame, often turning striking blue and purple in a cool finish, developing a sweet, berry aroma. Because it flowers on age, its harvest comes on a fixed, quick timeline.
Yields are modest, around 350 g/m² indoors and 50-120 g per plant outdoors on its short cycle. Give the small canopy good light, keep the buds supported if they get heavy, feed it lightly through flower, and harvest when most of the trichomes have turned cloudy with a few amber for the fullest sweet-berry flavor and the most rounded effect.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry protects both the sweet, berry aroma and the blue-purple color, so do not rush it with heat or a dehumidifier cranked too high.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the berry, fruity and sweet notes and smooths the smoke, turning a freshly dried auto harvest into the rich, sweet, fruity result Blueberry is loved for.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Blueberry Auto is a resinous little plant, so even its small amount of trim is good for dry sift, bubble hash or rosin. That resin and sweet, berry aroma make the trim genuinely useful, turning offcuts into a flavorful concentrate run rather than waste.
Flavor and Terpenes
Blueberry Auto leads with a sweet, berry flavor over a soft, fruity base, the classic blueberry profile that made Blueberry one of the most loved fruity strains. It is a smooth, sweet smoke, and a good cure really brings that berry-and-sweet character forward in the jar and on the inhale.
Its terpene profile shapes that flavor. Myrcene drives a sweet, fruity, mellow base, while caryophyllene adds a warm, peppery spice and humulene brings a woody, earthy depth. A touch of alpha-pinene and beta-pinene, along with a little delta-3-carene, lift the profile with a fresh, piney edge, and linalool adds a soft floral note. Together these terpenes frame the sweet, berry, fruity character this strain is known for.
Effects and Best Use
With its medium 17-23% THC and strongly indica 80/20 make-up, Blueberry Auto delivers a gentle, body-leaning experience. It is reported as happy, relaxed and talkative, pairing an easy, upbeat mood with a comfortable, settled body, which makes it a good strain for unwinding in the evening without being overpowering. Its medium potency keeps it approachable and easy to dose.
That happy, relaxed, talkative profile makes it an easygoing strain for winding down with good company while enjoying its sweet, berry flavor. The combination of a fast, compact, colorful auto grow, a gentle balanced effect and a classic fruity taste is exactly why this Blueberry autoflower has stayed a favorite.
Common Problems and Pro Tips
Blueberry Auto is forgiving, but autos reward a careful start. Sow it straight into its final pot to avoid a transplant check, go light on the nutrients while it is young, and do any training early and gently, because once an auto starts flowering it will not recover lost time. Stick to low-stress training only, and only while the plant is still growing, as this small plant has little size to spare.
Because it stays compact and yields modestly, the way to get the most from it is good light and a healthy, unchecked start rather than heavy training. Keep the air moving around the buds, hold humidity sensible through flower, and defoliate the odd large fan leaf so light reaches the lower buds. To bring out the famous blue and purple tones, let the nights cool a few degrees late in flower.
As a pro tip, make the most of its flavor and color: let the late-flower nights run cool for the richest blue, keep the feed modest, and protect the terpenes with a proper plain-water flush and a full three to four week cure. Save the resinous trim for concentrates, and harvest when most trichomes are cloudy with a few amber for a sweet, fruity result.
FAQ
Is Blueberry Auto an autoflowering strain?
Yes. Blueberry Auto flowers automatically with age rather than on a change in the light cycle, so you keep it under long days, usually 18/6 or 20/4, from seedling to harvest. It starts flowering on its own a few weeks after sprouting and runs its whole life cycle in about 8 to 10 weeks from seed to harvest, which makes it fast and simple to grow.
Should I transplant Blueberry Auto?
No. Autos grow fast and do not like having their roots disturbed, so start Blueberry Auto straight in its final pot rather than transplanting it. Sow the seed into the container it will finish in, go easy on the feed while it is young, and let it establish without a check. A smooth, uninterrupted start is the single biggest thing you can do for a strong finish.
How do I get Blueberry Auto to turn blue or purple?
The blue and purple tones come out most strongly when the nights cool down a little late in flower. Let the temperature drop a few degrees after lights-off in the final couple of weeks and the buds and leaves tend to show richer color. It is largely genetic, so it will color up anyway, but a cool finish brings out the best of it.
How long does Blueberry Auto take?
Blueberry Auto runs its whole life cycle in about 8 to 10 weeks from seed to harvest, because it flowers on age rather than on the season. That short, fixed timeline means you can plant it almost any time where it is warm enough, and outdoors you can fit more than one cycle into a long, warm year. There is no light-cycle change to manage.
What does Blueberry Auto taste like?
It has a sweet, berry flavor over a soft, fruity base, the classic blueberry profile. Myrcene drives the sweet, fruity base, caryophyllene a peppery spice, humulene a woody depth, and a touch of pinene a fresh lift, with linalool a soft floral note. A proper three to four week cure really brings that sweet-berry character forward on the inhale.
How much does Blueberry Auto yield?
It is a modest yielder, giving around 350 g/m² indoors and 50-120 g per plant outdoors on its short cycle, so it is grown more for its famous flavor and color than for bulk. Give the compact plant good light, a big enough final pot and an open canopy to get the most from its sweet, colorful buds.
