Jack 47
Cannabis seeds
by Sweet Seeds
Jack 47 Feminized Cannabis Seeds by Sweet Seeds
Jack 47 is a feminized cannabis seed from Sweet Seeds that crosses two of the most respected genetics in cultivation — AK-47 and Jack Herer — into one Sativa-dominant powerhouse. The result is a vigorous grower with THC levels reaching up to 24%, heavy resin production, and yields that can hit 700 grams per plant outdoors. If you want a seed that performs hard in both the grow room and the garden, this is where your shortlist starts.
This guide is written for adults aged 18 and over. Grow data and effect profiles described below apply to adult cultivators and consumers.
Why Jack 47 Seeds Deserve a Spot in Your Grow
Jack 47 feminized seeds exist because Sweet Seeds wanted to push strength as far as it would go. They took AK-47 — already famous for enormous harvests paired with a potent effect — and crossed it with Jack Herer, a strain with an almost mythical reputation among growers and smokers alike. The offspring inherited the best from both parents: the structural vigour and yield potential of AK-47, and the complex, sharp flavour profile that Jack Herer is celebrated for.
What you get in practice is a Sativa-dominant plant that grows tall, grows fast, and stacks on weight. The resin coverage is dense enough that you can smell her throughout the entire cultivation period — not a faint whiff, but a proper room-filling aroma that builds as the buds mature. Sweet Seeds reports THC levels reaching up to 24%, which puts Jack 47 firmly in the upper tier of what feminized photoperiod seeds can deliver.
The one thing to watch: that Sativa dominance means she stretches. If you're growing indoors in a small tent — say a 60x60 — you'll need to train her early or she'll outgrow the space. Outdoors, she's got room to do her thing, and that's where the really impressive numbers come in. We'd pick this over a pure Jack Herer seed if yield matters to you as much as potency.
Jack 47 Specifications and Growing Data
Sweet Seeds packs the genetics tight into this one. Here's what you're working with straight from the breeder data.
| Specification | Detail |
|---|---|
| Seed Bank | Sweet Seeds |
| Genetics | AK-47 x Jack Herer |
| Type | Feminized (photoperiod) |
| Dominance | Sativa dominant |
| THC Content | Up to 24% |
| Seed to Harvest | 10-11 weeks |
| Indoor Yield | 500-600 g/m² |
| Outdoor Yield | 500-700 g per plant |
| Seeds per Pack | 3 |
| Fungus Resistance | High (reported immune to common fungal attacks) |
| Resin Production | Dense, heavy coverage |
| Aroma During Grow | Strong throughout entire cultivation |
Jack 47 Yield Potential: Indoor vs Outdoor
The numbers on Jack 47 are genuinely impressive for a feminized photoperiod strain. Indoors, Sweet Seeds lists 500-600 grams per square metre — that's competitive with dedicated commercial strains. Outdoors, you're looking at 500-700 grams per individual plant, which is the kind of figure that makes the effort of a full outdoor season feel properly rewarded.
| Growing Environment | Yield Range | Notes |
|---|---|---|
| Indoor (per m²) | 500-600 g | Train early to manage Sativa stretch |
| Outdoor (per plant) | 500-700 g | Thrives in open space; all soil types |
Sweet Seeds states that the combined AK-47 and Jack Herer genetics make Jack 47 suitable for all types of cultivation, on all kinds of soils and growing media. That fungal resistance is a genuine advantage — if you've ever lost a late-season outdoor plant to botrytis, you know how much that matters. She's not invincible, but she's tougher than most.
How Jack 47 Smells, Tastes, and Hits
Here's where Jack 47 gets interesting beyond the grow stats. The aroma starts early and doesn't let up — Sweet Seeds notes she diffuses a strong smell during the entire cultivation period, so if discretion is part of your setup, factor in a decent carbon filter from the start. The scent is complex, layered, and fills whatever room she's in.
The flavour is described by the breeder as very tasty, and the effect profile is what makes the 24% THC figure meaningful rather than just a number on a page. Sweet Seeds characterises the effect as an extremely sharp combination of physical stone and interior high. That's the AK-47 and Jack Herer genetics pulling in different directions — one grounding you in the body, the other lifting the mind. It's not a one-note experience.
Honestly, at 24% THC, this isn't a seed we'd recommend as your very first grow if you're also new to strong cannabis. The effect is potent and layered. If you've grown a couple of rounds and you want to step up to something with real presence in both the garden and the jar, Jack 47 is the move.
How to Grow Jack 47 Feminized Seeds
- Germinate your Jack 47 seeds using the paper towel method or directly in a starter plug. Keep the environment warm (around 22-25°C) and moist but not soaking.
- Transplant seedlings into their final container or growing medium once the taproot is established and the first true leaves appear. Jack 47 is reported to thrive in all soil types and growing media, so use whatever suits your setup.
- Provide 18 hours of light during the vegetative phase. Because of her Sativa dominance, Jack 47 grows vigorously and tall — start low-stress training (LST) early if you're indoors and need to manage canopy height.
- Switch to a 12/12 light cycle to trigger flowering. The full seed-to-harvest cycle runs 10-11 weeks on average, so plan your calendar accordingly.
- Monitor resin development as the buds mature. Jack 47 produces dense, heavy resin coverage — use a jeweller's loupe to check trichome colour for your preferred harvest window.
- If growing outdoors, harvest when the buds are fully mature and trichomes have shifted from clear to milky/amber. Outdoor plants can produce 500-700 grams each, so have your drying space sorted well in advance.
- Dry in a dark, well-ventilated space at around 18-22°C and 55-65% humidity for 7-14 days, then cure in airtight jars for at least 2-4 weeks to bring out the full flavour profile.
Growing Jack 47 indoors? Pair these seeds with a proper grow tent and carbon filter setup — that strong aroma throughout the cultivation cycle means ventilation isn't optional. A jeweller's loupe is also worth grabbing to nail your harvest timing on those resin-heavy buds.
Jack 47 vs Other Sweet Seeds Strains
If you're browsing the Sweet Seeds catalogue and wondering where Jack 47 sits, here's the honest take. Compared to a pure autoflower from the same breeder, Jack 47 demands more attention — she's photoperiod, so you control the veg and flower timing, and the Sativa stretch means you need vertical space or training skills. But the payoff is significantly higher yields (500-700g outdoor vs the 100-200g you'd get from most autos) and a THC ceiling of 24% that most autoflowers can't touch.
Against other feminized photoperiod seeds in a similar price range, Jack 47's main selling point is that dual genetic heritage. AK-47 brings the bulk and the resilience; Jack Herer brings the flavour complexity and the cerebral edge to the effect. You're not choosing between yield and quality — you're getting both in one seed. The 3-pack format means you're not overcommitting either. Three plants outdoors at 500-700g each is potentially over 2kg of dried flower from a single pack of seeds.
Frequently Asked Questions
How long does Jack 47 take from seed to harvest?
Sweet Seeds lists the average harvest period at 10-11 weeks from seed to crop. That's for the full cycle. Outdoors, your local climate and light hours will influence the exact timing, but 10-11 weeks is the breeder benchmark.
Is Jack 47 suitable for beginner growers?
The genetics are robust and Sweet Seeds reports strong fungal resistance, which helps. The main challenge for beginners is managing the Sativa-dominant stretch indoors. If you've got outdoor space and decent soil, she's actually quite forgiving. Indoors, learn some basic low-stress training first.
What yield can I expect from Jack 47 indoors?
Sweet Seeds reports 500-600 grams per square metre indoors. That's at the high end for feminized photoperiod seeds. Actual results depend on your lighting, nutrients, and how well you manage the canopy — but the genetic potential is there.
Does Jack 47 smell a lot during growing?
Yes. Sweet Seeds specifically notes that she diffuses a strong smell during the entire cultivation period. If you're growing indoors, a carbon filter and proper extraction are not optional — your neighbours will know otherwise.
What is the THC level of Jack 47?
Sweet Seeds reports THC levels reaching up to 24%. That puts Jack 47 in the upper range of commercially available feminized seeds. The actual percentage in your harvest depends on growing conditions, but the genetic ceiling is high.
Can I grow Jack 47 in any type of soil?
According to Sweet Seeds, Jack 47 is suitable for all types of cultivation on all kinds of soils and growing media. The combined AK-47 and Jack Herer genetics give her broad adaptability — soil, coco, hydro, she handles them all.
How many seeds come in a pack of Jack 47?
This pack contains 3 feminized seeds. All seeds are feminized, so you won't need to identify and remove males — every seed should produce a flowering female plant.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.