303 OG Feminized vs Ace of Spades Autoflower — Side-by-Side Comparison
303 OG Feminized versus Ace of Spades Autoflower is one of the more revealing matchups you can run as a home grower. The two strains share the same shelf at most seed banks, but their THC ceilings, flowering windows, and yield profiles diverge enough that a single decision tree can save you a full season of regret.
303 OG Feminized vs Ace of Spades Autoflower at a glance
| Spec | 303 OG Feminized | Ace of Spades Autoflower |
|---|---|---|
| THC | 24%winner | 20% |
| Strain split | 58% Indica / 42% Sativa | 66% Indica / 34% Sativa |
| Flowering time | — | 8-10 weekswinner |
| Indoor yield | — | 350-500g/m² |
| Outdoor yield | — | 50-200g/plant |
| Plant height | — | 60-100cm |
| Difficulty | Intermediate | Easywinner |
| Autoflower | No | Yes |
| Feminized | Yes | Yes |
Effects compared
303 OG Feminized delivers
Both share
Ace of Spades Autoflower delivers
303 OG Feminized and Ace of Spades Autoflower both bring relaxed, happy to the experience, but 303 OG Feminized leans more into euphoric territory while Ace of Spades Autoflower pushes harder on sleepy effects.
Growing 303 OG Feminized vs growing Ace of Spades Autoflower
303 OG Feminized
- Flowering: Not specified
- Indoor yield: Not specified
- Outdoor yield: Not specified
- Height: Not specified
- Difficulty: Intermediate
303 OG Feminized autoflower seeds — hybrid genetics at 22-26% THC. Relaxed effects with earthy flavor. Ships across Canada.
Ace of Spades Autoflower
- Flowering: 8-10 weeks
- Indoor yield: 350-500g/m²
- Outdoor yield: 50-200g/plant
- Height: 60-100cm
- Difficulty: Easy
Ace of Spades Autoflower delivers relaxing indica effects in a fast-finishing autoflowering format — seed to harvest in 9-11 weeks.
Ace of Spades Autoflower finishes 91 weeks sooner than 303 OG Feminized, which matters most for outdoor growers chasing the first frost or anyone running back-to-back indoor cycles. On harvest weight, Ace of Spades Autoflower edges ahead, especially when you give it a full SCROG net. If you are still building muscle memory around feeding and humidity control, lean on Ace of Spades Autoflower.
Which should you grow?
So which strain wins?
Best for beginners
Ace of Spades Autoflower
Best yield
Ace of Spades Autoflower
Fastest harvest
Ace of Spades Autoflower
Highest THC
303 OG Feminized
Frequently asked questions
Which is stronger, 303 OG Feminized or Ace of Spades Autoflower?+
303 OG Feminized comes in higher on the lab sheets at around 24%, compared with 20% for Ace of Spades Autoflower. That said, real-world potency depends on phenotype, cure, and grow conditions — both strains can deliver a serious hit when grown well.
Which yields more, 303 OG Feminized or Ace of Spades Autoflower?+
Ace of Spades Autoflower pulls ahead on yield with up to 350-500g/m², while 303 OG Feminized tops out around . If grams per square meter is the deciding factor, Ace of Spades Autoflower is the safer pick.
Which is faster to harvest?+
Ace of Spades Autoflower flowers in around 8-10 weeks, beating 303 OG Feminized's window. For a quicker turn-around or for outdoor growers fighting an early frost, Ace of Spades Autoflower is the smarter bet.
Which is easier to grow?+
Ace of Spades Autoflower is the more forgiving plant of the two — rated Easy versus Intermediate for 303 OG Feminized. First-time growers will have a smoother run with Ace of Spades Autoflower, especially in a small tent.
Where can I buy 303 OG Feminized or Ace of Spades Autoflower seeds in Canada?+
Royal King Seeds carries both 303 OG Feminized and Ace of Spades Autoflower as feminized seeds shipped discreetly across Canada. Each strain ships with our germination guarantee and tracked Canada Post delivery in plain unmarked packaging. Visit the 303 OG Feminized page or the Ace of Spades Autoflower page to pick your pack size in CAD.
Related comparisons
303 OG Feminized vs $100 OG Feminized
Side-by-side comparison
Ace of Spades Autoflower vs 13 Dawgs Feminized
Side-by-side comparison
303 OG Feminized vs 24k Gold Autoflower
Side-by-side comparison
Ace of Spades Autoflower vs 24k Gold Feminized
Side-by-side comparison
303 OG Feminized vs 3 Kings Autoflower
Side-by-side comparison
Ace of Spades Autoflower vs 3 Kings Feminized
Side-by-side comparison