Serious Kush
Cannabis seeds
by Serious Seeds
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Serious Kush Feminised Cannabis Seeds
Serious Kush is a feminised cannabis seed from Serious Seeds that crosses an original OG Kush clone with the legendary White Russian — producing a heavily indica-dominant plant with dramatically improved yields and a thick coat of trichomes inherited from its White Russian parent. If you already love OG Kush but wish it produced more bud per square metre, this is the answer Serious Seeds spent years developing.
Why Serious Kush Seeds Deserve a Spot in Your Grow Room
The original OG Kush has been a grower favourite for decades, but it's always had a frustrating reputation for modest yields. Serious Seeds addressed that head-on by crossing an authentic OG Kush clone — sourced directly from the US — with their own White Russian, a strain that already earned a Cannabis Cup and a reputation for absurd resin production. The result is Serious Kush: same beloved dank Kush character, but the plant actually fills out properly during flower.
We've carried Serious Seeds since the early days of the shop, and their genetics are consistently stable. That matters more than most growers realise until they've dealt with a pack of seeds that throws three different phenotypes. With Serious Kush, what you see in the strain description is what you get in the tent. The buds grow dense and heavy, absolutely caked in sticky trichomes — that's the White Russian genetics doing their thing. Under decent light, the crystal coverage extends down the sugar leaves and even onto smaller stems. It's the kind of plant you photograph before you harvest.
The honest limitation? She's a hungry plant. That improved yield doesn't come from nowhere — you'll want to keep your feeding schedule dialled in, particularly during the second half of flowering when those buds are packing on weight. Underfeed her and you'll leave grams on the table. She's not a low-maintenance autoflower you can neglect for a week.
Serious Kush Aroma and Flavour Profile
This is where the OG Kush parentage really shines through. Serious Kush carries that unmistakable deep, dank Kush scent — earthy, slightly fuel-tinged, with a richness that fills the room the moment you crack a jar open. There's a reason "kushy" became its own flavour category among cannabis enthusiasts, and Serious Kush delivers it without dilution. The White Russian cross adds a subtle layer of sweetness underneath, but make no mistake: this smells and tastes like proper Kush. If you're growing indoors, a decent carbon filter isn't optional — she's loud from about week four of flowering onwards.
Serious Kush Growing Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Serious Seeds |
| Genetics | OG Kush (US clone) x White Russian |
| Seed Type | Feminised |
| Dominant Type | Indica-dominant |
| Flowering Time | 56–63 days |
| Indoor Yield | 400–500g/m² |
| Growing Environment | Indoor and outdoor |
| Seeds Per Pack | 6 |
| Trichome Coverage | Very heavy (White Russian trait) |
| Aroma | Deep, dank Kush with subtle sweetness |
Growing Serious Kush Seeds: Step-by-Step
- Germination. Use the paper towel method or soak seeds in a glass of room-temperature water for 12–24 hours until taproots emerge. Serious Seeds genetics typically show strong germination rates within 48 hours.
- Seedling stage. Transplant into small pots with a light, airy medium. Keep humidity around 65–70% and light intensity low. She'll show indica-typical broad leaves early on.
- Vegetative growth. Serious Kush responds well to topping and LST (low-stress training). Because she's indica-dominant, she stays relatively compact — an 80x80cm tent handles 2–4 plants comfortably. Veg for 3–5 weeks depending on your canopy goals.
- Flip to flower. Switch to a 12/12 light cycle. She'll stretch moderately during the first two weeks, then focus energy on bud production. This is when the crystal coverage starts becoming visible.
- Mid-flower feeding. From week 4 onwards, she gets hungry. Increase phosphorus and potassium — she's building dense buds and needs the nutrition to hit that 400–500g/m² potential. Watch for any signs of nutrient deficiency on lower fan leaves.
- Harvest window. At 56–63 days of flowering, check trichomes with a loupe. Mostly cloudy with 10–20% amber is the sweet spot for a heavy, body-focused effect. Don't rush this — an extra few days can make a real difference in density.
- Drying and curing. Hang whole plants or individual branches in a dark room at 18–20°C with 55–60% humidity. Slow-dry for 10–14 days, then jar-cure for at least two weeks. That Kush aroma deepens significantly during a proper cure.
Serious Kush vs. Other Kush Strains
If you're comparing Serious Kush to other Kush genetics in our catalogue, the key differentiator is yield. A standard OG Kush typically produces 300–350g/m² — respectable but not exactly generous for the space and time invested. Serious Kush pushes that to 400–500g/m² without sacrificing the flavour profile that makes OG Kush special. That's a 30–40% improvement in output from the same footprint.
| Feature | Serious Kush | Standard OG Kush |
|---|---|---|
| Yield (indoor) | 400–500g/m² | 300–350g/m² |
| Flowering Time | 56–63 days | 56–65 days |
| Trichome Coverage | Very heavy | Moderate to heavy |
| Aroma | Dank Kush + sweet undertones | Dank Kush, earthy |
| Genetics | OG Kush x White Russian | Pure OG Kush line |
Compared to Serious Seeds' own White Russian — which is the other parent here — Serious Kush leans much more heavily into that indica body effect and Kush flavour. White Russian is more balanced and cerebral. If you want the Kush experience with White Russian's resin production bolted on, Serious Kush is the one to grow.
What the Research Says About Cannabis
Cannabis research continues to expand globally. According to Cannabis sativa research trends, challenges, and new perspectives (PMC8605354), this review "discusses the diverse aspects of cannabis research developments ranging from traditional use as herbal medicine to the latest potential in various fields." And according to Hemp (Cannabis sativa L.) Phytochemicals and Their Potential (PMC12897246), compounds found in Cannabis sativa "exhibit antioxidant, anti-inflammatory, neuroprotective, and antimicrobial properties, which have stimulated research into their potential applications."
It's worth noting that research also highlights the importance of responsible use. According to Adverse Health Effects of Marijuana Use (PMC4827335), "although multiple studies have reported detrimental effects, others have not, and the question of whether marijuana is harmful remains the subject of heated debate." Common side effects documented in clinical literature include dry mouth, dizziness, and increased appetite. According to Cannabis: A Toxin-Producing Plant with Potential Therapeutic Uses (PMC7915118), "cannabis intoxication is dose-related, and its absorbance depends on the route of administration and concentration being used."
Complete your grow setup: If you're running Serious Kush indoors, pair these seeds with a proper grow tent and carbon filter — she's a fragrant plant and you'll want odour control from week four onwards. A jeweller's loupe is also worth grabbing for checking trichome ripeness during that 56–63 day harvest window.
Frequently Asked Questions
How long does Serious Kush take to flower?
Serious Kush flowers in 56–63 days. Most phenotypes finish closer to the 60-day mark under standard indoor conditions with a 12/12 light cycle. Check trichomes with a loupe rather than relying purely on the calendar.
What yield can I expect from Serious Kush indoors?
Indoor yields range from 400–500g/m² with proper lighting and nutrition. That's a significant step up from standard OG Kush, which typically tops out around 300–350g/m². Keep feeding consistent during mid-to-late flower to hit the upper end of that range.
Is Serious Kush suitable for beginner growers?
She's manageable for growers with at least one successful run under their belt. The plant is stable and doesn't throw unexpected phenotypes, but she's nutrient-hungry during flowering. If you can keep a feeding schedule consistent, you'll be fine. Total beginners might want to start with something less demanding.
What does Serious Kush smell like?
Deep, dank Kush — earthy and slightly fuel-tinged with a subtle sweetness from the White Russian parent. She's loud during flowering, so indoor growers should budget for a carbon filter. The aroma intensifies further after a proper two-week cure in jars.
What genetics are in Serious Kush?
Serious Seeds crossed an original OG Kush clone sourced from the US with their award-winning White Russian. The OG Kush provides the classic dank flavour and indica structure, while the White Russian contributes improved resin production and better yields.
How many seeds come in a pack of Serious Kush?
Each pack contains 6 feminised seeds. Feminised means no males to identify and remove — every seed should produce a flowering female plant under normal conditions.
Can Serious Kush be grown outdoors?
Yes, she grows well outdoors in warm, Mediterranean-style climates. The indica structure keeps her relatively compact, which is useful if space is limited. Outdoors, expect harvest around late September to early October in the Northern Hemisphere.
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.