Blue Strains

What Are Blue Cannabis Strains?

The “Blue” family is a bloodline. Almost every strain in this collection carries Blueberry genetics in some form – a lineage DJ Short developed in the 1970s by crossing Afghani indica with Highland Thai and Purple Thai sativas. That specific gene pool is what gives these strains their signature sweet, fruity smell and their tendency to show purple and blue tones when temperatures drop in late flower.

That colour comes from anthocyanins – the same pigments that turn blueberries dark, red grapes purple, and autumn leaves crimson. In cannabis, cooler nights during the final weeks of flowering trigger them. Drop below around 15°C (60°F) after lights-out and you’ll often see purples and deep blues develop across the buds and fan leaves. Not every phenotype will colour heavily – it depends on the genetics and how cold it actually gets – but the sweet aroma tends to hold true either way.

Effects range from deeply relaxing to uplifting, depending on which branch of the family you’re growing. Blueberry and Blue Cheese sit heavily on the indica end – good for evenings, good for sleep. Blue Dream and Blue Haze are sativa-dominant, more energetic and social. Blue Gelato 41 and the newer hybrids sit in the middle, combining high potency with that characteristic berry sweetness.

Popular Blue Strains in Our Collection

Blue Dream

The most famous blue strain in the world. Blue Dream is a sativa-dominant Blueberry x Haze cross that was the best-selling cannabis strain across US dispensaries for years running. Fruity, uplifting, approachable – it works for first-time growers but it’s good enough that experienced growers still reach for it. Available in feminised and autoflowering versions from multiple seedbanks.

Blue Cheese

A UK classic. Blue Cheese crosses Blueberry with the Original UK Cheese (a Skunk #1 phenotype) to produce something that’s a little sweet, a little funky, and very much its own thing. It’s indica-dominant, flowers fast, and grows well indoors – probably the most-grown blue strain among UK collectors. Barney’s Farm and several other top breeders offer it in our range.

Blueberry (DJ Short)

The original and still one of the best. DJ Short’s Blueberry is mostly indica, slow to flower, and rewards patience with buds that shift through red, blue, and deep purple as they ripen. The sweet berry smell is strong and unmistakable. It’s the strain that started the whole family and it’s still worth growing for anyone who wants to go back to the source.

Blue Haze

Blueberry meets Haze. The result is more uplifting than most blue strains – the high is cerebral and creative rather than couch-heavy, while the fruity flavour of the Blueberry parent still comes through. A good pick if you want something in the Blue family without the strong indica feel.

Blue Gelato 41

A more modern take on blue genetics from Barney’s Farm. Blueberry is crossed with Gelato 41 here, pushing sweetness and potency up considerably – THC can hit 26%+ and indoor flowering runs around 8-9 weeks. It’s one of the flashiest strains in the collection and has been popular since it launched.

Why Grow Blue Cannabis Strains?

There are a few good reasons the Blue family has stayed popular for fifty years.

The flavour is the obvious one. Sweet, fruity, berry-forward – blue strains are among the most pleasant-smelling plants you can grow indoors. That comes mainly from myrcene and linalool in the terpene profile, which also contributes to the calm, relaxing character of most Blue varieties.

The effects suit a lot of growers. The blue indica end of the family – Blueberry, Blue Cheese, Blue Kush – are ideal for winding down at the end of the day. The sativa crosses, like Blue Dream and Blue Haze, work well for daytime. Either way, the high tends to be smooth rather than jarring, which is why blue weed gets recommended to beginners and is still grown by experienced collectors.

The look is a genuine bonus. Drop temperatures in the last few weeks of flower and blue strains can produce some of the most visually striking buds you’ll ever grow – purples, deep blues, near-black in the right phenotypes. It’s not guaranteed, but the genetics make it possible.

And the range here is wide. Seven pages of products, covering autoflowering versions for beginners right through to high-THC blue genetics from premium breeders. Whatever your setup or experience level, there’s a blue strain in here that’ll work for you.

Why Buy Blue Strain Seeds From SeedMasters.com?

• Free seeds with most orders – many packs in our collection include bonus seeds.
• One collection, dozens of seedbanks – we stock Blue strains from across the industry so you can compare genetics without visiting ten different sites.
• Fast, discreet worldwide delivery – your order ships quickly and arrives well-packaged, with stealth delivery options also available.
• Helpful, no-nonsense advice – not sure which strain would complement your collection? Just ask our team.
• Trusted by many across the USA, Canada, UK, Europe and Australia.

Frequently Asked Questions

What makes a cannabis strain a “blue strain”?

Blue strains are varieties that carry Blueberry genetics – the lineage DJ Short developed in the 1970s using Afghani indica crossed with Thai sativas. The name refers to this genetic heritage and the flavour profile (sweet, berry-forward) as much as to actual colour. Not every blue strain will turn visibly blue or purple, though many do given the right temperatures.

Do blue strains actually turn blue when you grow them?

Some do, some don’t. The colour comes from anthocyanins, which are triggered by cooler night temperatures – typically below 15°C (60°F) – in the last few weeks of flowering. If you can drop the temperature after lights-out, you’ll often see purples, blues, and deep violets develop across the buds and leaves. Strains with stronger Blueberry genetics tend to colour up more reliably than lighter crosses.

Are blue strains indica or sativa?

It depends on the strain. The original Blueberry is mostly indica, and classic derivatives like Blue Cheese and Blue Kush stay indica-dominant. Blue Dream and Blue Haze are sativa-dominant, with a brighter, more energetic effect. There are plenty of balanced hybrids in between – Blue Gelato 41 and Blue Cookies both sit somewhere in the middle.

What do blue strains taste like?

Sweet and fruity, with a berry quality that ranges from fresh blueberry to jammy and earthy depending on the strain. Blue Cheese adds a savoury, funky edge from its UK Cheese parent. Blue Gelato 41 leans candy-sweet and dessert-like. Most share that characteristic fruity core that traces directly back to the Blueberry parent genetics.

Which blue strain is best for beginners?

Blue Dream auto is a popular starting point – it flowers on its own schedule without needing a light change, tends to be forgiving, and produces good yields. Blue Cheese is another solid option: compact, fast, and reliable in most grow setups. Both are available in feminised versions so there’s no need to worry about identifying and removing male plants.

Which blue strain has the highest THC?

Blue Gelato 41 regularly comes in above 26% THC and is one of the most potent strains in the collection. Blue Dream typically ranges from 17-23% depending on the seedbank and version. For something more moderate, original Blueberry strains usually sit between 15-20%.

Can blue strains be grown outdoors?

Yes – many blue strains do well outdoors, and the natural temperature drop in late summer and autumn often brings out better colour than indoor grows. Blue Dream is particularly well-known as a high-yielding outdoor variety. Just check the harvest window for whichever strain you choose; some need until mid-October in northern climates to finish properly.

Blue strains have been a cornerstone of cannabis seed collecting since the 1970s – and the genetics have only improved since. Whether you’re tracking down an original Blueberry or picking up something newer like Blue Gelato 41, the full range is right here. Any questions, our team is happy to help you find the right strain.