Yumbolt 47

Yumbolt 47 Feminised Cannabis Seeds by World Of Seeds

Yumbolt 47 is a feminised cannabis seed from World Of Seeds that crosses AK-47 with a male Yumbolt to produce a 90% Indica powerhouse with 20% THC and yields up to 500g/m² indoors. She's forgiving, fast-flowering, and built for growers who want heavy harvests without heavy maintenance. If you've been looking for a strain that delivers commercial-grade output with beginner-friendly cultivation, this is where you start.

Why Yumbolt 47 Seeds Deserve a Spot in Your Grow Room

World Of Seeds bred Yumbolt 47 by crossing the legendary AK-47 — known for its resin production and potency — with a male Yumbolt, an old-school Afghani-lineage Indica that brings density, frost, and that unmistakable heavy body effect. The result is a plant that's roughly 90% Indica with a sliver of Sativa influence, just enough to keep things interesting without stretching your vertical space.

What makes this strain stand out from the dozen other Indica-dominant feminised seeds we carry? Resilience. Yumbolt 47 is highly resistant to mould and pests, and she forgives irrigation mistakes — overwater her slightly, underwater her slightly, she'll shrug it off and keep stacking bud. We've seen first-time growers pull respectable harvests from this genetics because the plant genuinely wants to succeed. That's not something you can say about every strain in the catalogue.

The buds themselves are candle-shaped, dense as a doorstop, and absolutely crusted in trichomes after a proper cure. Crack one open and you'll notice the resin sticking to your fingers before you even get to the grinder. At 20% THC, this is a strain that commands respect — the Indica dominance means the effect is heavily physical, the kind that pins you to the sofa and makes you forget you were planning to do laundry. World Of Seeds themselves say "sip it, don't devour it," and we'd echo that. Go slow.

Yumbolt 47 Grow Specifications

Indoor vs Outdoor Growing with Yumbolt 47 Seeds

Yumbolt 47 performs well in both environments, but the numbers shift depending on where you plant her.

Indoors, she stays compact and bushy — typical Indica structure. You won't need to fight her for headroom. A 55-65 day flowering window means you can run multiple cycles per year if you're running a perpetual setup. Outdoors, expect her to bulk up considerably. The 500-600g per plant figure assumes decent sun exposure and a warm-enough autumn to let her finish by early October. If you're in Northern Europe, keep an eye on late-season humidity — even though her mould resistance is high, dense Indica buds and persistent rain are never a great combination.

How to Grow Yumbolt 47 Feminised Seeds

1. Germinate your Yumbolt 47 seeds using the paper towel method or directly in a small pot of moist, airy substrate. Taproots typically emerge within 24-72 hours.
2. Transplant seedlings into their final containers once they've developed 2-3 sets of true leaves. A 10-15 litre pot works well for indoor grows; outdoor plants benefit from 20+ litres or direct ground planting.
3. Maintain 18/6 light during vegetative growth. Yumbolt 47's compact Indica structure means she doesn't need a long veg period — 3-4 weeks is usually enough before flipping to 12/12.
4. Switch to 12/12 to trigger flowering. She'll start showing pistils within the first week and will bulk up rapidly between weeks 3-6.
5. Keep relative humidity below 50% during late flowering. Those dense, candle-shaped buds hold moisture, so good airflow through the canopy is critical even with her natural mould resistance.
6. Harvest when trichomes shift from clear to milky with a few amber heads — typically at 55-65 days of flowering. The amber ratio you choose will affect the character of the final product.
7. Dry slowly in a dark room at 18-20°C and 55-60% humidity for 7-10 days, then cure in glass jars for at least 2 weeks. The crystal coverage on Yumbolt 47 buds really comes alive after a proper cure.

Honest Limitations of Yumbolt 47

No strain is without trade-offs, and we'd rather you know before you buy. Yumbolt 47's 90% Indica genetics mean the buds get extremely dense — that's great for bag appeal and yield weight, but it also means you need to stay on top of your airflow. Even with high mould resistance, stagnant air in a packed canopy is asking for trouble. If you're running a SOG with multiple plants per square metre, invest in oscillating fans and don't skip defoliation during the stretch.

The other thing worth mentioning: at 20% THC and near-pure Indica genetics, this is not a daytime strain. The physical effect is heavy. If you're after something you can smoke and still function, look at a more balanced hybrid like AK-47 from Serious Seeds or a Sativa-dominant option. Yumbolt 47 is an evening strain, full stop. World Of Seeds put it best — sip it, don't devour it.

Compared to something like Critical Mass by Mr. Nice Seeds, Yumbolt 47 offers similar yields but finishes faster (55-65 days vs 8+ weeks) and brings more frost to the table. If speed and resin production are your priorities, Yumbolt 47 wins. If you want even heavier yields and don't mind waiting, Critical Mass is worth a look.