FastBerry Auto
Cannabis seeds
by Fast Buds
FastBerry Auto Cannabis Seeds by FastBuds
FastBerry Auto is an autoflowering, mostly Indica cannabis seed based on the legendary USA Blueberry line — bred to go from germination to harvest in just 9 weeks flat. FastBuds crossed their BC old school Blueberry phenotype with a Canadian ruderalis to produce a short, stocky plant that punches well above its weight class in yield. If you want that classic blueberry flavour and purple-hued buds without a long wait, this is the seed to drop.
This product ships as a pack of 3 feminised autoflowering seeds. Every seed is female — no males to cull, no sexing required.
Why FastBerry Auto Seeds Deserve a Spot in Your Grow
Nine weeks. That's germination to chop. Most photoperiod Blueberry cuts take 8–9 weeks of flowering alone, after you've already vegged them for a month. FastBerry Auto compresses the entire lifecycle into the same window, and it does so without sacrificing the traits that made Blueberry a household name in the first place — the deep berry aroma, the colour shift to blue and purple, and that unmistakable long-lasting body relaxation.
We've watched autoflowers go from novelty to genuine contender over the past decade, and FastBerry Auto sits comfortably in the "proper auto" category. Indoor yields of 450–500g/m² from a plant that tops out at 70–120cm are genuinely impressive. That's dense canopy territory — you can fit several of these into an 80x80 tent and still have room for airflow. Outdoors, expect 50–250 grams per plant depending on your climate and how much direct sun the plant gets.
The one thing to watch: temperature. If you want those famous blue and purple hues, you'll need to drop your night-time temperatures during the last couple of weeks of flowering. Around 15–18°C at lights-off does the trick. If you grow in a warm climate year-round, the buds will still be excellent — they just won't turn colour. The flavour and potency are unaffected either way.
FastBerry Auto Strain Profile and Specifications
FastBerry Auto carries 18% THC and 1% CBD — a ratio that delivers a strong, body-focused effect with just enough cannabidiol to take the edge off. The buds are heavy, compact, and coated in trichomes. When properly dried and cured, they release a very fruity aroma and taste of blueberry that fills the room the moment you crack a jar.
| Specification | Detail |
|---|---|
| Seed Bank | FastBuds |
| Genetics | USA Blueberry (BC old school phenotype) x Canadian Ruderalis |
| Type | Autoflowering, Feminised |
| Indica / Sativa | Mostly Indica |
| THC | 18% |
| CBD | 1% |
| Seed to Harvest | 9 weeks from germination |
| Plant Height | 70–120 cm |
| Indoor Yield | 450–500 g/m² |
| Outdoor Yield | 50–250 g per plant |
| Aroma and Flavour | Blueberry, forest fruits, sweet |
| Effect | Long-lasting body relaxation |
| Pack Size | 3 seeds |
How FastBerry Auto Compares to Other Blueberry Autos
There are a handful of Blueberry autoflowers on the market, and FastBerry Auto holds its own against any of them. The 9-week total lifecycle is on the faster end — some competing Blueberry autos run 10–11 weeks. The 18% THC is solid without being overwhelming, and the 1% CBD adds a layer of physical comfort you won't get from a zero-CBD strain. If you're after something with a bit more kick, FastBuds' Gorilla Glue Auto pushes higher THC numbers but loses the blueberry terp profile entirely. For flavour chasers, FastBerry Auto is the better pick.
| Trait | FastBerry Auto | Typical Blueberry Auto (other breeders) |
|---|---|---|
| Seed to Harvest | 9 weeks | 10–11 weeks |
| THC | 18% | 15–20% |
| CBD | 1% | Trace–1% |
| Indoor Yield | 450–500 g/m² | 350–450 g/m² |
| Height | 70–120 cm | 60–110 cm |
| Colour Change | Blue/purple with cool nights | Varies by phenotype |
Aroma, Flavour, and What to Expect From the Buds
Crack open a cured jar of FastBerry Auto and the first thing that hits you is ripe blueberry — not artificial, not candy-sweet, but the real deal. Underneath that top note there's a layer of mixed forest fruits and a subtle floral sweetness that rounds out the profile. When grinding a bud, the scent intensifies and fills the room with that berry-sweet blend.
The buds themselves are dense and heavy for an autoflower. They compact tightly on the branches, which is partly why the yields are so respectable despite the short stature. Trichome coverage is generous — under a loupe you'll see a thick carpet of milky-white heads, which is exactly what you want to see at harvest time. The 18% THC and 1% CBD translate into a long-lasting body relaxation that settles in gradually and sticks around. It's an evening strain, no question about it.
How to Grow FastBerry Auto Seeds
- Germinate your FastBerry Auto seeds using the paper towel method or directly in a small pot of moist, airy substrate. Taproots typically emerge within 24–72 hours.
- Plant the germinated seed 1–2 cm deep in its final container — autoflowers don't like transplanting. A 10–15 litre pot with light, well-draining soil works well. Coco-perlite mixes are also a solid choice.
- Provide 18–20 hours of light per day from seedling through harvest. FastBerry Auto doesn't need a light cycle change to flower — it triggers automatically around week 3–4.
- Keep feeding light during veg. Once you see the first pistils, gradually increase nutrients to support bud development. This strain responds well to a standard autoflower feeding schedule — don't overdo the nitrogen once flowering starts.
- During the last 2 weeks of flowering, drop night-time temperatures to 15–18°C if you want the blue and purple colour change. This step is optional but visually stunning.
- Harvest around week 9 from germination when trichomes are mostly milky with a few turning amber. Dry slowly in a dark room at 18–20°C and 55–60% humidity for 7–10 days, then cure in glass jars for at least 2 weeks for the best blueberry flavour.
Running FastBerry Auto in a tent? Pair these seeds with a complete grow kit — tent, light, ventilation, and carbon filter all sorted in one go. A 10-litre fabric pot per plant keeps the root zone aerated, which autoflowers love. And if you're growing in coco, grab a coco-perlite mix and a dedicated coco nutrient line to get the most out of these genetics.
Honest Limitations — What FastBerry Auto Won't Do
FastBerry Auto isn't going to stretch to fill a large grow space on its own. At 70–120 cm, it's a compact plant. If you're used to training photoperiod monsters across a full SCROG net, you'll need to adjust expectations — or simply run more plants per square metre. The upside is that the short stature makes it brilliant for small tents, stealth grows, and balcony setups where height is limited.
The 18% THC is respectable but not chart-topping. If you're chasing 25%+ numbers, this isn't the strain for you. What it does offer is a well-rounded cannabinoid profile — that 1% CBD alongside the THC creates a more balanced physical effect than a pure THC powerhouse. For a lot of growers, that's actually the better smoke.
Frequently Asked Questions
How long does FastBerry Auto take from seed to harvest?
Nine weeks from germination to harvest. That's the full lifecycle — no separate veg and flower periods to manage. Some phenotypes may run a few days longer, but 9 weeks is the standard.
Is FastBerry Auto suitable for beginner growers?
Yes. The autoflowering genetics mean no light schedule changes, no sexing, and a forgiving growth pattern. Keep your watering consistent and don't overfeed, and you'll pull a solid harvest on your first run.
Will FastBerry Auto turn purple?
Most phenotypes display blue and purple hues when night-time temperatures drop to around 15–18°C during the final weeks of flowering. In consistently warm environments, the buds stay green but the flavour and potency remain the same.
What does FastBerry Auto smell and taste like?
Ripe blueberry dominates, backed by forest fruits and a subtle floral sweetness. The aroma intensifies after a proper 2-week cure in glass jars — don't rush the drying process if you want the full terp profile.
How much does FastBerry Auto yield indoors?
Expect 450–500 g/m² indoors under 18–20 hours of light. Outdoors, yields range from 50 to 250 grams per plant depending on sunlight exposure and growing conditions.
Can I grow FastBerry Auto outdoors?
Absolutely. The compact 70–120 cm height and 9-week lifecycle make it well suited to balconies, gardens, and guerrilla grows. Plant after the last frost and you can harvest well before autumn weather sets in.
What size pot should I use for FastBerry Auto?
A 10–15 litre pot is the sweet spot. Autoflowers have a fixed lifecycle, so they won't grow into a massive root system — but going too small (under 7 litres) will cap your yield potential.
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.