Mack and Crack Auto (Seedstockers)

Mack and Crack Auto Seeds by Seedstockers

Mack and Crack Auto is an autoflowering cannabis seed from Seedstockers that delivers around 30% THC in a plant that practically grows itself. Born from the original Mack and Crack collaboration between Humboldt and Seedstockers, this auto variant keeps the same face-melting potency but shaves the timeline down to roughly 11 weeks from seed to harvest. No photoperiod fuss, no light schedule headaches — just drop the seed and let her do her thing.

Why Mack and Crack Auto Seeds Stand Out

Thirty percent THC from an autoflower is not something you see every day. Most autos top out around 20–24%, which makes Mack and Crack Auto genuinely unusual. Seedstockers and Humboldt originally bred the photoperiod version as a potency project, and the autoflowering conversion hasn't dulled the edge one bit. A couple of hits from a properly cured batch of this strain and even seasoned smokers notice the difference — it's a strong, uplifting head effect that leans social rather than couch-locked.

The flavour profile backs up the potency. Expect citrus on the inhale — sharp, almost like fresh grapefruit peel — followed by a spicy, peppery mid-note and a herbal, earthy finish. According to a review published in The Cannabis Terpenes (PMC, NIH), beta-caryophyllene is the most available sesquiterpenoid in cannabis plants, and it's likely responsible for that peppery bite you'll pick up when you crack open a cured jar. The nose fills a room quickly; if discretion matters, plan your drying space accordingly.

The honest limitation here? She comes in packs of 3 seeds only. No 5-packs or 10-packs, so if you want to run a full tent of Mack and Crack Auto you'll need to grab multiple packs. That said, the germination rates from Seedstockers tend to be solid — we've had very few complaints.

Mack and Crack Auto Specifications

Growing Mack and Crack Auto Cannabis Seeds

This is one of those strains where you can genuinely just follow the basics and still pull impressive results. Mack and Crack Auto doesn't demand special feeding schedules, exotic substrates, or a PhD in plant science. She's robust enough to handle temperature swings, minor nutrient imbalances, and the kind of rookie mistakes that would punish a fussier cultivar. That 11-week seed-to-harvest window is fast — you could realistically run three cycles in a single year indoors.

One thing we'd flag: because THC levels sit around 30%, the buds get extremely resinous toward the end of flowering. Your scissors, your trimming gloves, your grinder — everything will get sticky. Budget extra time for trimming and consider a dry trim rather than wet if you want to preserve those terpenes. The citrus and spice notes come through much stronger when you let the plant dry slowly at around 15–18°C with 55–60% humidity for 10–14 days.

1. Germinate your Mack and Crack Auto seeds using the paper towel method or directly in a moist seedling plug. Tap roots typically appear within 24–72 hours.
2. Transplant into your final container once the tap root is 1–2 cm long. Autos don't like being repotted, so go straight to your final pot — 11–15 litres works well.
3. Run an 18/6 or 20/4 light schedule from start to finish. No need to switch to 12/12; the ruderalis genetics handle the flowering trigger internally.
4. Feed lightly during the seedling stage and ramp up nutrients during weeks 3–7 as the plant enters its main growth and early flowering phase.
5. Watch for heavy resin production from week 8 onwards. Check trichomes with a jeweller's loupe — harvest when roughly 70–80% are milky with a few amber heads for the best balance of potency and flavour.
6. Dry slowly in a dark, cool room (15–18°C, 55–60% RH) for 10–14 days, then cure in glass jars for at least 2 weeks. The spicy, citrus terpene profile develops noticeably during a proper cure.

Mack and Crack Auto vs Other High-THC Autoflowers

If you're weighing up your options, here's how Mack and Crack Auto compares to a couple of other popular high-THC autos in the catalogue.

Mack and Crack Auto wins on raw THC numbers, though it takes a week or so longer than some competitors. If you want the absolute strongest auto you can get your hands on, this is the one we'd point you toward. If you'd rather sacrifice a few percentage points for a sweeter flavour profile or a slightly faster turnaround, Gorilla Cookies Auto or Wedding Cheesecake Auto are solid alternatives.