King Kong
Cannabis seeds
by Dr. Underground
King Kong Feminized Cannabis Seeds by Dr. Underground
King Kong is a feminized cannabis seed from Dr. Underground that crosses Ed Rosenthal Super Bud with a specially selected reversed Chronic, producing a Sativa-leaning hybrid capable of yielding over 900g/m2 indoors in just 7-8 weeks of flowering. That's a number most strains twice her flowering time can't touch. If you're after sheer volume without a drawn-out wait, this is the seed to grow.
Why King Kong Feminized Seeds Stand Out
We've carried a lot of feminized seeds over the years, and most strains make you choose: fast flowering or big yields. King Kong tells you to stop choosing. Dr. Underground crossed two proven heavyweights — Ed Rosenthal Super Bud, already famous for resin production, with a reversed Chronic selected specifically for yield and vigour. The result is a feminized seed that flowers in 7-8 weeks and still pushes past 900 grams per square metre under optimal conditions.
For context, that puts King Kong in the same output territory as strains that need 10-12 weeks to finish. She does it nearly a month faster. If you're running a perpetual setup or just want to flip rooms quickly, that turnaround time changes your entire calendar.
One thing to flag: she branches out aggressively. King Kong is a vigorous grower with wide lateral spread, so if you're working in a smaller tent — say a 60x60 — you'll want to train her early. LST or a ScROG net will keep her manageable and actually improve light penetration across those lower bud sites. In a larger space, she'll fill it without much encouragement.
King Kong Flavour and Aroma Profile
Open a jar of cured King Kong and the first thing that hits you is a sharp, sour lemon note layered over a deep skunk base. It's not subtle — your carbon filter earns its keep with this one. As the buds break apart, there's an incense-like sweetness underneath, almost resinous, with faint haze undertones that linger on the fingers.
On the inhale, that lemon-skunk combination translates directly to flavour. The smoke is dense and full, with a sweet-and-sour character that connoisseur growers genuinely appreciate. If you've grown Ed Rosenthal Super Bud before, you'll recognise the resin-heavy terpene signature — King Kong inherits that sticky, aromatic quality and amplifies it with Chronic's sweeter edge.
Compared to something like Critical Mass or Big Bud, which lean more earthy and muted in flavour, King Kong has a noticeably more complex terpene profile. You're not just growing for weight here — though the weight is very much there — you're growing something you'll actually enjoy smoking.
King Kong Grow Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Dr. Underground |
| Seed Type | Feminized |
| Genetics | Ed Rosenthal Super Bud x Chronic (reversed) |
| Dominant Type | Sativa-dominant |
| Flowering Time | 7-8 weeks |
| Indoor Yield | Up to 900g/m2 (optimal conditions) |
| THC Content | 14-20% |
| Resin Production | Very high |
| Growth Pattern | Vigorous, wide lateral branching |
| Seeds per Pack | 2 |
| SKU | CSDU0005 |
King Kong THC and Effects
At 14-20% THC, King Kong sits in a moderate range — strong enough to deliver a proper effect, but not so overpowering that less experienced users get blindsided. The effect leans cerebral, as you'd expect from a Sativa-dominant hybrid. There's an uplifting, clear-headed quality to it that keeps you functional rather than couch-locked.
According to research published in Pharmacokinetics of Orally Applied Cannabinoids and Their Preparations, different cannabis preparations can vary significantly in onset and duration of effects depending on the cannabinoid profile and method of consumption (PMC10057980). King Kong's moderate THC percentage means you get a consistent, manageable experience — particularly relevant if you're growing for personal use and want something you can reach for regularly without recalibrating your tolerance every session.
That said, the 14-20% range means potency will vary between phenotypes. Some plants will express closer to 14%, others will push toward 20%. Growing conditions, light intensity, and nutrient management all play a role. If you're chasing the higher end of that range, dial in your environment and don't skimp on the bloom feed during weeks 4-6.
How to Grow King Kong Feminized Seeds
- Germinate your King Kong feminized seeds using the paper towel method or directly in a starter plug. Maintain a temperature of 22-25°C and keep the medium moist but not waterlogged. Taproots typically emerge within 24-72 hours.
- Transplant seedlings into their final containers once the first set of true leaves appears. King Kong's vigorous root system benefits from at least 11-litre pots for indoor grows. Fabric pots promote air pruning and prevent root circling.
- During vegetative growth, expect rapid lateral branching. Begin low-stress training (LST) early — within the first 2-3 weeks of veg — to open up the canopy. A ScROG net set at roughly 40cm above the pot rim works well for controlling her spread in tents under 120x120cm.
- Flip to 12/12 when the canopy fills approximately 60-70% of your available space. King Kong stretches moderately during the first two weeks of flower, so account for that vertical growth.
- During flowering, increase phosphorus and potassium feeds from week 3 onward. Her high resin production demands adequate nutrition — watch for yellowing lower leaves as a sign she's hungry. Maintain relative humidity below 50% from week 5 to reduce mould risk on those dense, resin-coated buds.
- Harvest at 7-8 weeks of flowering. Check trichomes with a jeweller's loupe — mostly cloudy with 10-15% amber is the sweet spot for that uplifting cerebral effect. Waiting longer shifts the experience toward heavier sedation.
- Dry in a dark room at 18-21°C with 55-60% humidity for 10-14 days. Cure in glass jars for a minimum of 2 weeks, burping daily for the first 5 days. The lemon and incense notes develop significantly during a proper cure.
King Kong vs Other High-Yield Feminized Strains
| Strain | Flowering Time | Indoor Yield | THC Range | Dominant Type |
|---|---|---|---|---|
| King Kong (Dr. Underground) | 7-8 weeks | Up to 900g/m2 | 14-20% | Sativa-dominant |
| Critical Mass | 8 weeks | Up to 650g/m2 | 19-22% | Indica-dominant |
| Big Bud | 8-9 weeks | Up to 600g/m2 | 15-20% | Indica-dominant |
The comparison speaks for itself. King Kong outproduces both Critical Mass and Big Bud by a significant margin, and finishes faster than either. Where she trades off is in raw THC potency — Critical Mass can push higher — and in growth habit. King Kong demands more horizontal space and active training. If you've got the room and the patience for a bit of canopy management, she rewards you with genuinely exceptional output.
Honest Limitations
No strain is without trade-offs, and King Kong has a couple worth mentioning. First, that vigorous lateral growth. In smaller tents, she can become unruly fast. If you're working in a 60x60cm space, you'll struggle to keep one plant contained without aggressive training, and two plants would be a nightmare. She really wants an 80x80 or larger.
Second, the aroma during flowering is intense. Lemon, skunk, incense — all at volume. A decent carbon filter isn't optional here; it's mandatory if discretion matters to you at all. We'd recommend pairing any King Kong grow with a properly sized extraction fan and carbon filter rated for your tent's volume.
Third, the 900g/m2 yield figure is achievable but represents optimal conditions — strong lighting (600W HPS or equivalent LED), dialled-in nutrients, proper training, and environmental control. Under more casual conditions, expect 500-700g/m2, which is still excellent for a 7-8 week strain.
Growing King Kong indoors? Pair her with a complete grow tent kit that includes extraction and carbon filtration — you'll need it for those pungent terpenes. A ScROG net is also worth picking up to tame her lateral spread and maximise light distribution across the canopy.
Frequently Asked Questions
Is King Kong an indica or sativa strain?
King Kong is a Sativa-dominant feminized hybrid. Her genetics combine Ed Rosenthal Super Bud with a reversed Chronic selection. The effect leans cerebral and uplifting rather than sedating, though the Chronic parentage adds body and yield.
How much can King Kong yield indoors?
Under optimal conditions — strong lighting, proper training, and dialled-in nutrients — King Kong can produce up to 900g/m2. Under more typical home-grow conditions, 500-700g/m2 is a realistic expectation, which is still impressive for a 7-8 week flowering period.
Does King Kong need training or can I let her grow naturally?
You can grow her untrained, but we wouldn't recommend it in smaller spaces. King Kong branches out vigorously and will fill a tent quickly. LST or a ScROG net keeps her manageable and actually improves yields by exposing more bud sites to direct light.
What does King Kong smell and taste like?
Sharp sour lemon over a deep skunk base, with incense-like sweetness and faint haze undertones. The flavour follows the aroma closely — dense, full smoke with a sweet-and-sour character. A carbon filter is strongly recommended during flowering.
How many seeds come in a pack of King Kong?
This pack contains 2 feminized seeds from Dr. Underground. All seeds are feminized, so every plant that germinates will produce flowers — no need to identify and remove males.
Is 14-20% THC considered strong?
It's moderate. Strong enough for a clear, enjoyable cerebral effect, but not in the 25%+ territory that can overwhelm less experienced users. The exact THC will vary by phenotype and growing conditions — better environment and nutrition push toward the higher end of the range.
Can I grow King Kong in a 60x60cm tent?
Technically yes, but she'll fight you for space. King Kong's vigorous lateral branching really wants an 80x80cm tent or larger. In a 60x60, you'd need to start training very early and keep just one plant. We'd pick a larger tent if you have the option.
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.