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Strain at a Glance
A sativa-dominant autoflower with up to 30% THC and a candy banana and diesel flavour.
Genetic Balance
Key Information
- THCUp to 30%
- GeneticsAlaskan Thunderfuck × Amherst Banana × Sour Diesel Auto
- TasteSweet candy • Banana • Skunk • Herbal
- Seed to harvest11–12 weeks
Specifications
| Strain | Thunder Banana |
|---|---|
| Seed type | Autoflower, feminized |
| Genetics | Alaskan Thunderfuck × Amherst Banana × Sour Diesel Auto |
| Genetic balance | Autoflower, sativa dominant |
| THC | Up to 30% |
| Taste | Sweet candy, Banana, Skunk, Herbal |
| Seed to harvest | 11–12 weeks |
| Yield | 450–550 g/m² indoors, 200–300 g per plant outdoors |
| Pack size | 5 Seeds by Pack |
These figures are ranges, not promises. Flowering time, harvest date and yield vary depending on growing conditions: the grower, the method and the season's weather. "Mold resistant" means mold tolerant: less prone to mold and slower to be affected. No strain is 100% mold resistant. How we set these numbers →
Taste & Aroma Profile
Candy-sweet banana over a skunky, herbal diesel backbone — the Banana OG sweetness riding the Sour Diesel fuel — with the sharp, resinous edge that Alaskan Thunderfuck brings.
About Thunder Banana
Genetics & strain profile
Thunder Banana Autoflower fuses three heavy hitters: Alaskan Thunderfuck, Amherst Banana (itself Sour Diesel and Banana OG) and Sour Diesel Auto, which supplies the autoflowering trait. The result is a sativa-dominant autoflower with up to 30% THC — one of the strongest autoflowers in the catalogue, and a strain that is bigger and slower than the typical auto. It has two reviews that disagree: a five-star grower who “received my seeds in 2 days, had 4 out of 5 germinated, the plants are 5 weeks old, just started flowering and they look great”, and a two-star buyer whose germination rate was low and who found it slow to get the issue resolved. We would rather hear about a problem than lose a customer: seeds that do not germinate are guaranteed, so contact us with your order number and we will sort it out. Our seeds are guaranteed.
How Thunder Banana Autoflower grows
Because it is an autoflower, it flowers on its own schedule without a change in light hours, and it is in flower by about week five from seed. It is not a small auto: it finishes in 11 to 12 weeks from germination and reaches a medium height of 3 to 5 feet indoors and 4 to 6 feet outdoors, so give it a 20-litre pot and some headroom in a tent. It gives 450 to 550 g/m² indoors and 200 to 300 g per plant outdoors under ideal sun. The sativa side wants light and warmth; feed moderately, keep training to the low-stress kind, and resist transplanting. Outdoors, planting in batches from April through June gives staggered harvests through August — fast enough to stay ahead of autumn mould and pests, which matters with buds this dense. Soak seeds 12 to 24 hours and plant them directly into warm, barely damp soil; count your sprouts at a week.
Taste, aroma and effect
Candy-sweet banana over a skunky, herbal diesel backbone — the Banana OG sweetness riding the Sour Diesel fuel — with the sharp, resinous edge that Alaskan Thunderfuck brings. The effect is euphoric and happy with a relaxed focus: a daytime-creative or social-evening strain rather than a couch one, but at up to 30% THC it is strong, so start small. For other banana strains, see Banana Kush and Strawberry Banana Fast Version; for the diesel side, Diesel; for another big sativa autoflower, Amnesia Autoflower.
Frequently Asked Questions
How long does Thunder Banana Autoflower take from seed to harvest?
11 to 12 weeks from germination. A reviewer’s plants were starting to flower at 5 weeks.
How much does Thunder Banana Autoflower yield?
450 to 550 g/m² indoors and 200 to 300 g per plant outdoors.
How strong is Thunder Banana Autoflower?
Up to 30% THC — one of our strongest autoflowers. Start small.
How tall does Thunder Banana Autoflower get?
3 to 5 feet indoors and 4 to 6 feet outdoors — big for an autoflower.
Is Thunder Banana Autoflower easy to grow?
It needs no light schedule, but it is a large, slow auto that wants light, warmth and a big pot; better for a grower with one auto run behind them.
What if my Thunder Banana seeds do not germinate?
They are guaranteed. One reviewer had 4 of 5 come up; another had a low rate. Contact us with your order number and we will make it right.
What does Thunder Banana Autoflower taste like?
Candy-sweet banana over skunky, herbal diesel.
What are the parents of Thunder Banana Autoflower?
Alaskan Thunderfuck, Amherst Banana (Sour Diesel x Banana OG) and Sour Diesel Auto.
Where can I buy Thunder Banana seeds in Canada?
Right here at Quebec Cannabis Seeds. Orders ship from Quebec within 24 hours on business days, in plain packaging, across Canada and to the USA, with a germination guarantee.
Order with confidence
- Germination guarantee. If fewer than 80% of your seeds germinate, we send replacement seeds.
- Delivery guarantee. We guarantee delivery of your order.
- Discreet packaging. Plain, unbranded packaging with no logos and no mention of the contents. No signature is required.
- Shipped from Quebec within 24 hours. Orders usually ship the same day or within 24 hours of payment, Monday to Friday. Canada: 3 to 7 days, or 2 to 3 days by Express. USA: 1 to 2 business days by Express. Free shipping on orders over $200.
- Your privacy. We do not sell or share your information with third parties.
- Free seeds with every order, and real people to help: 514-805-2741, Monday to Friday, 11 AM to 6 PM EST.
Details: Shipping · Return policy · FAQs · Privacy policy
- Availability: Out of Stock
- Model: Q.C.S.
- Manufacturer: AlphaType for Quebec Cannabis Seeds
27/05/2026
Received my seeds in 2 days. Had 4 out of 5 germinated. The plants are 5 weeks old just started flowering and they look great
Thanks QCS
27/05/2026
My experience was low germination rate....Like pulling teeth trying to get the issue resolved.
We guarantee our seeds. You just have to email us with your order ID