THC Bomb Auto by Bomb Seeds — autoflowering heavy-hitter
THC Bomb Auto is an autoflowering cannabis seed that delivers 18–22% THC and 400–450g/m² in just 65 days from germination. Bred by crossing the original THC Bomb with Auto Bomb, it's one of the few autos that genuinely competes with photoperiod yields — which is why commercial growers keep coming back to buy it.
Why growers pick this strain
Most autoflowers ask you to accept a trade: speed for size. This one doesn't really do that. Bomb Seeds took their photoperiod THC Bomb — a strain already known for heavy, resin-drenched buds — and crossed it with their Auto Bomb to keep the Ruderalis autoflowering trigger without gutting the yield. The result is a Sativa/Indica/Ruderalis hybrid that finishes in roughly 9 weeks from germination and still fills a tent.
The 400–450g/m² figure is what makes this one stand out on the shelf. Plenty of autos land around 250–350g/m² and call it a day. At 60–120cm tall with nicely branched structure, she's short enough for a stealthy 80x80 tent and productive enough to justify a 120x120 if you want to run four or six in a Sea of Green.
Potency sits in the 18–22% THC bracket, which puts her in the upper tier for autos. For context on where that lands: according to Healthline's review of high-THC cultivars, strains above 20% THC are considered high-potency, and Medical News Today lists reference strains like Skywalker OG at 22.9% and OG Shark at 21.4%. The EMCDDA's cannabis potency monitoring notes that average European flower THC has risen steadily over the past decade, which puts this one squarely in the modern range.
Effects profile — a proper nighttime smoke
The bud is built for evenings. Bomb Seeds describe an almost-immediate Sativa lift on the exhale — uplifting, talkative, social — followed a few minutes later by the Indica settling in and pinning you to the sofa. At higher doses it tips firmly sedative, which is why most growers earmark this one for after-work smoking rather than Monday morning.
Research on THC generally: according to a 2024 review in PMC (Hemp Seeds as a Valuable Source), over 120 phytocannabinoids have been identified in Cannabis sativa, with Δ9-THC being the primary psychoactive compound. The Cannabis Terpenes review (PMC, 2020) notes that terpene profile shapes the character of the experience alongside cannabinoid content — which is why two 20% THC strains can feel completely different. The Beckley Foundation's cannabis research programme has highlighted this entourage interaction repeatedly.
Variant guide
One pack available to buy:
- 5 feminized autoflowering seeds (SKU CSBO0020) — enough for a first run in an 80x80 tent, or a scouting round before you commit to a bigger grow
Specifications
| Breeder | Bomb Seeds |
| Genetics | THC Bomb × Auto Bomb |
| Type | Sativa / Indica / Ruderalis hybrid |
| Seed type | Feminized autoflowering |
| THC | 18–22% |
| Seed to harvest | 65 days |
| Yield | 400–450 g/m² |
| Height | 60–120 cm |
| Best for | SOG, ScrOG, commercial runs |
| Use case | Evening / nighttime |
| Pack size | 5 seeds |
Comparison vs other autoflowers
Most autoflowers fall into one of three brackets. Here's where this strain lands:
| Strain | THC | Yield | Seed to harvest |
|---|---|---|---|
| THC Bomb Auto | 18–22% | 400–450 g/m² | 65 days |
| Typical mid-tier auto | 14–18% | 250–350 g/m² | 70–80 days |
| Classic Auto Bomb | 15–20% | 350–400 g/m² | 70 days |
| Premium photoperiod (reference) | 20–25% | 500–600 g/m² | 110–120 days |
The takeaway: for an autoflower, the combination of sub-10-week finish, upper-tier potency and 400g+ yield is genuinely uncommon. Photoperiods still win on absolute ceiling, but the time cost is nearly double.
How to grow this strain
- Germinate in damp kitchen paper or a glass of water for 24–48 hours until the taproot shows.
- Transplant directly into the final pot — autos hate being moved, so skip the solo-cup stage. A 10–15L fabric pot is the sweet spot.
- Run 18/6 or 20/4 light from day one and keep it that way through the whole cycle. Autos don't need a flip.
- Start low on nutrients — autos are light feeders for the first 3 weeks. Ramp up when you see preflowers.
- For SOG: run 4–6 plants per m² and let them grow naturally. For ScrOG: install the net early, around week 3, and tuck gently. Heavy training stresses autos.
- Flush the last 7–10 days with plain pH'd water.
- Harvest at around 65 days from germination — check trichomes, aim for mostly cloudy with a few amber for that sedative nighttime finish.
Honest limitations
A few things to know before you order. Autos don't recover from mistakes the way photoperiods do — if you stunt her in week 2, you can't veg her for an extra fortnight to catch up. The 65-day clock keeps ticking. Second: 60–120cm is a wide range. Light intensity, pot size and pheno will decide where yours lands. If you're in a short tent, keep the pot small and train early-but-lightly. Third: 400–450g/m² assumes a tuned setup — good light (300W+ LED for a square metre), solid airflow, stable RH. Expect 250–350g/m² on a first run while you dial in.
Best for commercial and stealth growers
Perpetual-harvest growers get the most value here. If you're running new seeds every 3–4 weeks into a dedicated tent, this strain is one of the most productive autos we'd pick for that rotation. The fast turnaround means you're pulling roughly 5 harvests per year from a single tent instead of 3 with photoperiods. For commercial-scale growers, that math matters.
Complete your setup: pair these seeds with a 10–15L fabric pot, a quality LED grow light, and a basic pH meter. If you're new to autos, Bomb Seeds' Auto Bomb makes a solid sister strain for a mixed perpetual run.
Frequently Asked Questions
How long does THC Bomb Auto take from seed to harvest?
65 days from germination. That's roughly 9 weeks total — no separate veg and flower stages because she's autoflowering and switches on her own internal clock.
What yield can I expect?
Bomb Seeds quote 400–450 g/m² under tuned indoor conditions. Expect less on a first run — 250–350 g/m² is realistic while you dial in light, feed and airflow.
Is this strain suitable for beginners?
Yes, with one caveat. Autos are forgiving in that you don't manage a light schedule flip, but unforgiving in that they don't recover from stress. Feed lightly, don't overwater, and leave heavy training to photoperiods.
Is it better for daytime or nighttime use?
Nighttime. The initial Sativa lift fades quickly into a strong Indica body stone, especially at higher doses. Bomb Seeds specifically market her as an evening strain and for relaxing after work.
Does it work for SOG or ScrOG?
Both. Her branchy structure takes well to a screen, and her modest 60–120cm height makes her a natural for Sea of Green setups with 4–6 plants per square metre.
How potent is 18–22% THC in context?
High-tier. According to Medical News Today's strain reference, cultivars like OG Shark (21.4%) and Skywalker OG (22.9%) sit in the same range. Most commercial dispensary flower tests between 15–25% THC.
Where can I get these seeds?
Azarius stocks the 5-seed feminized autoflowering pack (SKU CSBO0020) direct from Bomb Seeds. Buy online and we ship discreetly across most of Europe.
This product is sold to adults aged 18 and over. Cannabis seeds are offered as collectibles and for genetic preservation.
Last updated: April 2026
