Blueberry

Blueberry Seeds — DJ Short's 1970s Classic That Started It All

The Blueberry strain needs no introduction. Bred by DJ Short in the 1970s from a cross of Afghani, Thai, and Purple Thai genetics, this is the original berry strain — the mother plant behind an entire family of blueberry cannabis seeds that now spans dozens of crosses. Our Azarius Seeds feminized version gives you three seeds of this indica-dominant legend at a price that makes experimenting easy.

If you've ever smoked anything with "blue" or "berry" in the name, this is where those genetics started. Blueberry weed earned its Cup wins for a reason: the flavour is unmistakable, the grow is forgiving, and the effect is exactly what you want at the end of a long day.

Growing Guide

Blueberry is a good pick if you've grown once or twice before and want something that rewards a little extra attention without punishing mistakes. The indica-dominant structure keeps plants compact and manageable — you won't need to worry about height getting away from you indoors.

Flowering wraps up in 8-9 weeks, which puts Blueberry on the faster side for a photoperiod. Expect 400-500 g/m2 indoors under decent light, or up to 600 g per plant outdoors in a good climate. The plants stay medium-height with that classic stocky indica build — short internodes, thick stems, broad fan leaves that soak up light efficiently.

One honest note: Blueberry can be a little fussy about nutrients compared to something like Northern Lights. She doesn't like being overfed. Start at about 75% of your usual nutrient strength and adjust from there. The flip side is that she's naturally resistant to mould, which is a genuine advantage if you're growing in a humid environment or outdoors in a European autumn.

The Purple Trick

This is the part people get excited about. Blueberry carries the genetics to produce deep purple and blue hues in the flowers and leaves — but it doesn't happen automatically. You need to drop nighttime temperatures to around 10-15 degrees Celsius during the last two weeks of flowering. The cold triggers anthocyanin production, and that's what gives you those deep purple tones. If you're growing indoors, an air-conditioned room or a cold basement at lights-off does the job. Outdoors, a late-season harvest in October naturally provides the temperature swing.

The colours don't change the potency or the flavour in any measurable way — but they look spectacular, and there's a real satisfaction in pulling a jar of deep purple Blueberry buds off the shelf.

Flavour and Effect

The taste is what built this strain's reputation. Rich, sweet berry on the inhale with a clean pine finish that keeps it from being cloying. There's a reason "blueberry" became an entire flavour category in cannabis — this is the original, and it's still one of the most authentic berry profiles you'll find. The sweetness comes through in the smell during flowering too, so keep your carbon filter running if discretion matters.

The effect is straightforward indica: deep physical relaxation, a warm uplifting headspace, and a gentle slide toward the couch. At 15-24% THC, it's potent enough to be genuinely relaxing without being the kind of strain that pins you down and won't let go. We'd call it an evening strain — put it at the end of your day, not the beginning.

Why Blueberry Over the Alternatives

Two comparisons come up constantly, so let's address them directly.

Blueberry vs Blueberry Auto: Same DJ Short genetics at the core, but this photoperiod version gives you more control. You decide when flowering starts by changing the light cycle, which means you can veg longer for bigger plants and higher yields. The photoperiod Blueberry also tends to reach higher THC levels and produces denser flower structure. The auto version is faster from seed to harvest and doesn't need light schedule management — but you trade away that control. If you've got the setup to run a 12/12 flip, the photoperiod is the stronger choice.

Blueberry vs Blue Dream: Blue Dream is actually a Blueberry cross — Blueberry mother paired with a Haze father. The result is a sativa-dominant hybrid that's energetic and cerebral where Blueberry is physical and calming. If you want the berry flavour with daytime functionality, Blue Dream is the one. If you want the berry flavour with genuine indica relaxation, Blueberry is what you're after. They're not competitors — they're different tools for different moments.

Pairs Well With

Frequently Asked Questions

Is Blueberry indica or sativa?

Blueberry is 80% indica and 20% sativa. The indica dominance shows in the plant structure — compact, bushy, medium height — and in the effect, which is physically relaxing with a warm uplifting. The 20% sativa contributes a pleasant mental lift that keeps the high from feeling heavy.

How long does Blueberry take to flower?

Blueberry flowers in 8-9 weeks from the flip to 12/12 lighting. Most phenotypes finish closer to the 8-week mark. You'll know she's ready when the trichomes shift from clear to milky white — check with a jeweller's loupe from week 7 onward.

What kind of yield can I expect from Blueberry seeds?

Indoors, expect 400-500 g/m2 under proper lighting with a standard 4-6 week veg period. Outdoors in a warm climate, individual plants can produce up to 600 g. Yield depends heavily on light quality and pot size — don't skimp on either.

How do I get Blueberry to turn purple?

Drop nighttime temperatures to 10-15 degrees Celsius during the last two weeks of flowering. The cold triggers anthocyanin pigment production, which creates those purple and blue hues. Indoors, this means cooling the grow room at lights-off. The colours are cosmetic — potency and flavour stay the same.

What's the difference between Blueberry and Blue Dream?

Blue Dream is a cross of Blueberry and Haze — a sativa-dominant hybrid that's uplifting and energetic. Blueberry itself is indica-dominant, producing deep physical relaxation. Same berry flavour family, completely different effects. Blueberry for evenings, Blue Dream for daytime.

Last updated April 2026.