Royal Jack Autoflower

Royal Jack Autoflower Cannabis Seeds

Royal Jack Autoflower is a feminized autoflowering cannabis seed by Royal Queen Seeds that brings the legendary Jack Herer genetics into a compact, fast-finishing format. Crossed with a ruderalis, this strain goes from germination to harvest in roughly 70 days — no light schedule fiddling, no towering plants eating your ceiling. Just solid Haze-Skunk-Northern Light genetics packed into a plant that tops out at 40–90cm. If you've got a balcony, a small tent, or a windowsill that gets decent sun, this one fits.

Jack Herer Genetics in an Autoflower Format

The original Jack Herer strain — named after the cannabis activist and author of The Emperor Wears No Clothes, who campaigned tirelessly until his death in 2010 — is a three-way cross of Haze, Northern Light, and Skunk. Royal Queen Seeds took that lineage and crossed it with a ruderalis to create Royal Jack Autoflower. The ruderalis genetics are what make it flower automatically based on age rather than light cycle, which strips out a lot of the complexity that puts off first-time growers.

What you keep from the Jack Herer side: that peppery, Haze-like aroma and a flavour profile that's herbal, spicy, and smooth on the exhale. The smoke is fresh rather than heavy — think dried herbs and cracked black pepper rather than diesel or skunk. It's one of those strains where the taste actually makes you want to go back for another bowl.

Growing Royal Jack Autoflower Seeds

Royal Jack Autoflower reaches harvest in approximately 9–10 weeks from germination. That's around 70 days total — among the faster turnarounds you'll find in the Royal Queen Seeds autoflower catalogue. The plants stay between 40cm and 90cm tall, which makes them genuinely manageable in small spaces. We've seen growers fit four of these into an 80x80 tent without any light competition issues.

Because it's an autoflower, you don't need to switch your light schedule to trigger flowering. The plant does that on its own, typically showing first pistils around week 4–5. This is when experienced growers start introducing bloom nutrients — community consensus suggests beginning at roughly a quarter of the recommended dose and building up gradually. Royal Jack Autoflower performs well in both soil and coco setups, and it handles outdoor conditions in temperate climates without drama.

The honest limitation here: 40–70g per plant isn't going to fill your jars for the year. If you're chasing massive yields, a photoperiod strain like the original Jack Herer feminized will outproduce this. But gram-for-gram relative to the effort involved, Royal Jack Auto is hard to beat. You're looking at roughly 10 weeks of low-maintenance growing for a solid personal stash.

Why Royal Jack Autoflower Belongs in Your Grow

There's a specific type of grower this strain was made for: someone who wants proper genetics without the fuss. Maybe you've got a small balcony in a flat. Maybe you've got a cupboard grow with one LED panel. Maybe you just don't want to spend 4–5 months waiting for a photoperiod to finish. Royal Jack Autoflower gets you from seed to dried flower in about 10 weeks, and the result is genuinely enjoyable to smoke — not just "good for an auto."

The effect sits in a sweet spot. It opens with an uplifting, creative head effect that keeps you motivated and chatty, then settles into a more relaxed, body-focused feeling without putting you on the sofa. It's a daytime-to-early-evening strain. We'd pick it over most indica-dominant autos if you want to stay functional. Compared to something like White Widow Auto or Amnesia Haze Auto from the same seed bank, Royal Jack Auto leans more balanced — less cerebral intensity than Amnesia, more character than White Widow.

The 40–90cm height range deserves a mention because it genuinely changes what's possible. At 40cm, you're looking at a plant that fits under a desk lamp grow. At 90cm, you've got a bushy little producer that fills out nicely with some light stress training. Either way, you're not fighting for vertical space, and you're not buying a second carbon filter because the tent can't contain the stretch.

How to Grow Royal Jack Autoflower

1. Germinate your seed using the paper towel method or directly in a small pot of moist soil. Keep the temperature around 22–25°C. Most seeds crack within 24–72 hours.
2. Transplant the sprouted seed into its final container — autos don't love being moved, so go straight to an 11-litre pot if possible. Use a light, airy soil mix or coco coir.
3. Provide 18–20 hours of light per day from germination through harvest. Autoflowers don't need a dark period to flower, and more light hours means more energy for bud production.
4. Start with plain water for the first 10–14 days. Around day 14, introduce a mild vegetative nutrient at roughly 1ml per litre — community growers report good results starting low and building gradually.
5. Watch for first pistils around week 4–5. When they appear, begin transitioning to bloom nutrients. Start at a quarter of the recommended dose and increase over the following weeks.
6. Keep humidity below 50% during the flowering phase to reduce the risk of mould — these compact plants can develop dense bud sites where moisture gets trapped.
7. Harvest when roughly 70% of the trichomes have turned milky white. At 9–10 weeks from germination, check daily with a jeweller's loupe. Expect 40–70g per plant once dried and cured.