Alien Gas XXL Auto by Silent Seeds

Alien Gas XXL Auto Strain Info

Looking for an autoflower that doesn’t play by the rules?

Alien Gas XXL Auto from Silent Seeds might be the rebel you're after, bringing photoperiod power into the fast lane of autos.

Born from the mind-bending union of Face Off OG and MAC Auto, this hybrid is anything but ordinary.

It’s like someone stuffed a rocket under an OG Kush and said, “Let’s see what happens.”

This is the new wave of autoflowering cannabis seeds — not just fast, but furious, frosty, and loud.

From the first days of growth, this plant comes alive with explosive energy, stretching up like it’s got something to prove.

And it does.

She builds into a dense, bushy structure with tight internodes and heavy side branching, looking more like a traditional OG photoperiod than your usual auto.

Expect heights between 140 and 180 cm (4.6 to 5.9 ft) outdoors — not exactly what you'd call shy.

The leaves keep that OG vibe too, with a rounded shape and medium size, soaking up light like they’re on a mission.

Even in legal large-scale grows, she’s a dream — genetically stable and beautifully uniform, perfect for those chasing consistency batch after batch.

Flowering Time & Yield

Here’s where Alien Gas XXL Auto really flexes — her flower game is outrageous.

In just 58 to 63 days from seed, she goes from zero to sticky colas dripping in resin, no detours.

Indoor grows can see returns up to 650 g/m² (22.9 oz/yd²), while outdoors she can go nuclear, hitting 1,200 g per plant (42.3 oz) under the right conditions.

That’s not just big for an auto — that’s straight-up XXL, and she wears it proudly in her name.

Every nug is dense, tight, and coated with trichomes like sugar on a glazed donut.

Perfect for smoking raw or turning into top-shelf extracts — this girl delivers whatever you're into.

Effects and Aroma

Light her up, and boom — she hits you with an old-school OG punch wrapped in something alien.

The terpene profile is pure gas station poetry: fuel, pine, citrus, spice, and that unmistakable dankness of classic Kush.

If you’ve ever cracked open a jar and had your eyebrows singed by lemony diesel fire — you’ll feel right at home here.

The high is just as intense — deeply relaxing, physically grounding, and long-lasting, with THC levels pushing 24–28%.

This is the kind of smoke that grabs your body by the shoulders and says, “Sit down, you’ve earned it.”

Perfect for those evening sessions when the day is done and all you want is peace, calm, and a couch you won’t be leaving anytime soon.

With less than 0.2% CBD, there’s nothing here to slow the ride down — it’s all about that full-throttle Indica cruise.

Grow Tips & What We Love Most

If you're chasing big yields without big headaches, Alien Gas XXL Auto checks all the boxes.

We’ve noticed she thrives best in warm, sunny climates, especially outdoors between late June and the end of October.

That said, she’s no diva — even in slightly cooler regions, she holds up like a champ.

Resistance to pests and diseases is one of her standout traits, making her a solid pick for growers who don’t want to spend their time battling mold, mites, or mildew.

She doesn’t flinch under pressure, staying strong through high humidity or heat waves of 30ºC (86ºF) and more.

Her robust structure and tight internodes also help minimize common stress points during the cycle.

In our experience, she fits right into both indoor tents and outdoor gardens — especially if you give her room to stretch and show off that XXL profile.

Even beginners can handle her, though she really shines in the hands of intermediate to expert growers who know how to guide her energy.

What grabs our attention the most is just how photoperiod-like this autoflower behaves — she doesn’t feel like an auto, she grows like a queen.

And when she starts packing on resin during bloom, you’ll understand why we’re so into her.

Strain Characteristics

Strain Name: Alien Gas XXL Auto

Seed Type: Feminized Autoflowering

Breeder: Silent Seeds

Genetics: Face Off OG x MAC Auto

Genotype: Hybrid

Flowering Time (Indoor): 58–63 days

Outdoor Harvest: Late June to Late October

Indoor Yield: Up to 650 g/m² (22.9 oz/yd²)

Outdoor Yield: Up to 1,200 g/plant (42.3 oz)

Height (Outdoor): 140–180 cm (4.6–5.9 ft)

THC Content: 24–28%

CBD Content: Less than 0.2%

Difficulty: Easy to Moderate

Climate: Warm, dry, and sunny

Resistance: High resistance to pests and mold

Structure: Compact, dense, OG Kush-like with tight internodes

Flavor Profile: Kush, gas, pine, lemon, spice

Effects: Physical, relaxing, long-lasting, perfect for nighttime use

Frequently Asked Questions

Is Alien Gas XXL Auto sativa or indica?

Alien Gas XXL Auto is a hybrid strain with dominant indica traits, offering strong physical relaxation and body-focused effects.

Indicas are known for their compact growth, fast flowering, and soothing, sedative highs — perfect for chilling out at night or unwinding after a long day.

Sativas, on the other hand, tend to grow taller, take longer to flower, and deliver more uplifting, cerebral effects.

Alien Gas XXL Auto blends the best of both worlds, but its structure and impact lean clearly toward the indica side.

How long does Alien Gas XXL Auto take to grow?

This autoflowering strain takes around 58 to 63 days from seed to harvest, making it one of the faster heavy-yielding autos on the market.

No need to change the light cycle — she’ll do her thing on her own schedule, indoors or outdoors.

Can Alien Gas XXL Auto grow well outdoors?

Absolutely — this strain performs exceptionally well outdoors, especially in warm, sunny climates between late spring and early autumn.

With the right conditions, she can stretch up to 180 cm (5.9 ft) and deliver yields up to 1,200 g (42.3 oz) per plant.

Is Alien Gas XXL Auto good for beginners?

Yes, she’s easy to moderate in difficulty, meaning beginners can grow her with success, but experienced growers can unlock her full XXL potential.

Her strong resistance to pests and diseases also makes her a forgiving option for less experienced hands.

What makes Alien Gas XXL Auto different from other autoflowers?

This strain stands out with photoperiod-level structure, XXL yields, and elite flower quality that rivals many feminized strains.

It’s part of a new generation of autoflowers that prove speed doesn’t have to mean compromise.