Double Blue
Cannabis seeds
by Amsterdam Genetics
Double Blue Cannabis Seeds by Amsterdam Genetics
Double Blue cannabis seeds produce a 70% indica-dominant hybrid that crosses Double Gum (a Bubble Gum backcross) with Blue Dream, one of the most celebrated strains to come out of the US. The result: dense, resin-caked flowers with up to 20% THC, a sweet berry aroma that fills the room, and a deeply relaxing stone that settles into the body without putting you to sleep. Amsterdam Genetics bred this one for flavour chasers and growers who want reliable, stress-tolerant plants. This guide is written for adults aged 18 and over.
Choose Your Pack Size
| Pack | Seeds | SKU |
|---|---|---|
| 3-pack | 3 feminised seeds | CSAM0077 |
| 5-pack | 5 feminised seeds | CSAM0078 |
The 3-pack is enough for a single tent run or a small outdoor patch. We'd go with the 5-pack if you want room to pick the best phenotype — not every seed expresses identically, and having two extras means you can select the standout plant for cloning or simply enjoy more variety across your canopy. You can buy Double Blue cannabis seeds in either pack size depending on your setup and goals.
What Does Double Blue Smell and Taste Like?
Double Blue cannabis seeds grow into plants with one of the most intensely sweet berry aromas you will find in any indica-dominant hybrid available today. Crack open a well-cured jar and you get hit with a wave of that sweetness — not subtle, not background noise, but right up front. There's a fruitiness underneath that leans toward blueberry jam rather than fresh fruit, and a slight bubblegum sweetness from the Double Gum parent that rounds the whole thing out. On the exhale, the berry notes sharpen and linger. If you've smoked Blue Dream before, you'll recognise the family resemblance, but Double Blue is sweeter and denser in flavour. The terpene profile is complex enough that the aroma shifts as the cure progresses — give your buds a proper 2-3 week cure and the sweetness deepens noticeably.
Honestly, this is one of those strains where the smell alone justifies the grow. But fair warning: the resin production and terpene intensity mean your carbon filter needs to be in good shape during late flower. Your neighbours will know what you're up to otherwise.
Double Blue Cannabis Seeds Growing Guide: What to Expect
Double Blue cannabis seeds germinate reliably and develop into forgiving plants that respond well to training and handle stress better than most indica-dominant hybrids. Here's what the grow cycle looks like from seed to harvest.
- Germination and seedling stage: Standard germination — paper towel method or directly into a starter plug. Double Blue seedlings show broad indica-style leaves early, with intense green colouring that stays throughout veg.
- Vegetative growth: Plants develop a strong central stem with plenty of lateral branching. This natural structure makes them excellent candidates for LST (low stress training), SCROG, or topping. The stress tolerance Amsterdam Genetics bred into this line means you can train aggressively without stunting growth.
- Indoor height management: Expect 100-150cm indoors. If you're working with a shorter tent (120cm or less), top early and use a SCROG net to keep the canopy flat. The branchy structure fills a net nicely.
- Outdoor growth: Given space, Double Blue can stretch to 200cm outdoors. She handles fluctuating temperatures and variable conditions well, making her a solid choice for northern European outdoor grows where weather changes quickly.
- Flowering: Switch to 12/12 and expect 9-10 weeks before harvest. The flowers are dense and pack on resin heavily in the final 2-3 weeks — don't chop early. Patience pays off with this one.
- Outdoor harvest timing: Typically ready by October. Watch the trichomes closely with a loupe; you want mostly cloudy with a few amber for that full-body indica effect.
- Drying and curing: Dry slowly at 18-20 degrees Celsius with 55-60% humidity for 10-14 days. Then jar-cure for at least 2 weeks. The berry sweetness really comes alive after a proper cure — rushing this step is the single biggest mistake we see growers make with flavour-forward strains like Double Blue.
Double Blue Effects and THC Profile
Double Blue delivers a deep physical relaxation paired with a positive, uplifted mood, driven by up to 20% THC and a 70/30 indica-sativa split. The onset is gradual — expect the body effects to build over 10-15 minutes before settling into a warm, heavy calm. Your mind stays clear enough to enjoy a film or conversation, but you won't be doing any productive work. This is a Friday-night-on-the-sofa strain, not a wake-and-bake.
According to the National Academies of Sciences, Engineering, and Medicine (2017), well-controlled studies support the use of cannabis for the treatment of chronic pain in adults, with cannabinoids showing meaningful analgesic effects (NBK425767). Research also suggests that phytocannabinoids demonstrate anti-inflammatory properties in various experimental models (Morales-Jadán et al., 2023; PMC10658372). The European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) notes that indica-dominant cannabis varieties with THC levels around 20% are among the most widely consumed in European markets, which aligns with the popularity of strains like Double Blue among adult consumers. These are research findings, not product claims — but they help explain why indica-dominant strains with this THC level are popular among people seeking physical comfort.
The one honest limitation: if you're sensitive to strong indicas, Double Blue at 20% THC can feel quite heavy. According to cannabis dosing research, starting at around 2.5mg THC is considered best practice for new patients, as recommended by Dr. Ethan Budd Russo, one of the leading cannabis researchers. If you're new to high-THC flower, take it slow — one or two draws, wait 15 minutes, then decide if you want more.
Double Blue vs Blue Dream: How Do They Compare?
Double Blue is the heavier, more physically relaxing counterpart to Blue Dream, trading sativa-driven energy for indica-dominant body effects while keeping the signature berry flavour. Since Double Blue has Blue Dream in its lineage, the comparison comes up constantly. Here's how they stack up.
| Trait | Double Blue | Blue Dream |
|---|---|---|
| Genetics | Double Gum x Blue Dream | Blueberry x Haze |
| Indica/Sativa | 70% indica / 30% sativa | 60% sativa / 40% indica |
| THC | Up to 20% | 17-21% |
| Flowering time | 9-10 weeks | 9-10 weeks |
| Indoor height | 100-150cm | 150-200cm |
| Dominant effect | Physical relaxation, calm mood | Uplifting, cerebral, energetic |
| Flavour | Sweet berry, bubblegum | Sweet berry, herbal |
The short version: Blue Dream leans sativa and keeps you moving. Double Blue borrows the berry flavour but swings hard toward the indica side, making it better suited for evening use and physical relaxation. If you want a daytime smoke, Blue Dream is the call. If you want to melt into the couch with something that tastes incredible, order Double Blue cannabis seeds instead. We'd pick Double Blue for the flavour alone — the Double Gum parent adds a bubblegum sweetness that straight Blue Dream doesn't have.
Why Double Blue Cannabis Seeds Deserve a Spot in Your Garden
Double Blue cannabis seeds consistently rank among the most reordered Amsterdam Genetics varieties in our catalogue, and the reason is straightforward: it's hard to find a strain that's this flavourful, this potent, and this easy to grow, all in one package.
The stress tolerance is genuinely impressive. We've seen growers accidentally overwater, overtrain, and generally make every beginner mistake in the book — and Double Blue still produces solid harvests. The dense flower structure and heavy resin production mean your yield-to-effort ratio is excellent, even if your technique isn't perfect yet. For more experienced growers, the branchy structure and training responsiveness open up real potential for maximising canopy coverage in a SCROG setup.
The one thing to watch: those dense buds can trap moisture in humid conditions. If you're growing in a tent, keep your humidity below 50% during the last 3-4 weeks of flower and make sure you've got good airflow between the colas. Bud rot is the enemy of every dense indica, and Double Blue is no exception. A small oscillating fan pointed at the canopy solves most problems before they start.
Complete your grow setup: Pair Double Blue cannabis seeds with a complete grow tent kit if you're starting from scratch — tent, light, ventilation, and carbon filter in one box. Already set up? A SCROG net is the best companion for Double Blue's branchy growth pattern, and a jeweller's loupe will help you nail the harvest window by checking trichome colour during those final weeks of flower. Browse our cannabis growing accessories and cannabis seed collection for everything you need to get started.
Double Blue Cannabis Seeds Specifications
| Specification | Detail |
|---|---|
| Seed bank | Amsterdam Genetics |
| Genetics | Double Gum x Blue Dream |
| Type | 70% Indica / 30% Sativa |
| THC content | Up to 20% |
| Flowering time (indoor) | 9-10 weeks |
| Harvest time (outdoor) | October |
| Indoor height | 100-150cm |
| Outdoor height | Up to 200cm |
| Flower structure | Dense, high resin production |
| Aroma | Sweet berry, fruit, bubblegum |
| Flavour | Sweet with pronounced berry on the exhale |
| Stress tolerance | High — responds well to LST, topping, SCROG |
| Available packs | 3 seeds / 5 seeds |
Frequently Asked Questions
Is Double Blue good for beginner growers?
Yes, Double Blue cannabis seeds are one of the better choices for first-time growers. The high stress tolerance and forgiving nature make this indica-dominant strain approachable even if your technique is still developing. The plants handle overwatering, aggressive training, and temperature fluctuations without dramatic yield loss. Just keep humidity in check during late flower to avoid bud rot in those dense colas.
Does Double Blue make you sleepy?
It can, especially at higher doses. The 70% indica genetics and 20% THC produce deep physical relaxation that often leads to drowsiness after an hour or two. It's best suited for evenings or weekends when you don't need to be sharp. A smaller dose keeps the mood positive without the heavy sedation.
What are the side effects of Double Blue?
Dry mouth and dry eyes are the most common. At 20% THC, overconsumption can lead to mild paranoia or anxiety, particularly for people with low tolerance. According to research published in PMC, cannabis use may cause short-term adverse effects including anxiety in some individuals (PMC5344774). Start with a small amount and wait before taking more.
How much does Double Blue yield indoors?
Amsterdam Genetics doesn't publish exact yield figures for Double Blue cannabis seeds, but the dense flower structure and heavy resin production suggest above-average returns for an indica hybrid in the 100-150cm height range. A well-trained SCROG canopy in an 80x80cm tent can produce a very satisfying harvest from 2-4 plants over the 9-10 week flowering period.
Can I grow Double Blue outdoors in northern Europe?
Yes. Double Blue finishes by October, which is manageable in most northern European climates. The robust genetics handle variable weather and temperature swings well, making this strain a solid choice for outdoor cultivation in regions like the Netherlands, Belgium, or northern Germany. The main risk is late-season rain and humidity — those dense buds need airflow to stay mould-free during the final weeks.
What's the difference between the 3-pack and 5-pack?
Both contain the same Amsterdam Genetics Double Blue feminised cannabis seeds. The 5-pack gives you room to select the best phenotype for your setup — not every seed expresses identically. If you're doing a single tent run with 2-3 plants, the 3-pack covers it. If you want to pheno-hunt or simply have backup seeds, get the 5-pack.
Why are more growers turning to blue cannabis strains?
Blue strains — Blue Dream, Blueberry, Double Blue — are popular because they combine distinctive sweet berry flavours with reliable genetics. The terpene profiles tend to be complex and aromatic, making them stand out in a market saturated with diesel and skunk flavours. Double Blue cannabis seeds add indica-heavy relaxation to that berry profile, which is a combination a lot of growers specifically look for.
Where can I buy Double Blue cannabis seeds?
You can buy Double Blue cannabis seeds right here at Azarius in either a 3-pack or 5-pack of feminised seeds from Amsterdam Genetics. Both options ship from our warehouse in the Netherlands.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.