MassKush
Cannabis seeds
by The Kush Brothers Seeds
We'll only email you about this product — no marketing.
MassKush Cannabis Seeds — Massive Yields from Bulletproof Indica Genetics
MassKush is a feminised cannabis seed from The Kush Brothers Seeds that crosses Confidential OG with Critical Mass to produce a 90% indica powerhouse built for enormous harvests. We're talking up to 600g/m² indoors and a genuinely staggering 1000g/plant outdoors — numbers that put most strains to shame. With an 8-week flowering time, robust pest resistance, and a dank, sweet terpene profile, MassKush is the kind of seed that makes you wonder why you'd bother with anything fussier.
MassKush is available in packs of 3 feminised seeds. Every seed is female — no males to cull, no wasted pots.
MassKush Genetics: Why This Indica Cross Delivers
The Kush Brothers Seeds are a Barcelona-based seed bank with a reputation for stress-testing their parent plants over multiple generations before releasing a cross. MassKush pairs two heavyweights: Confidential OG — a potent, resinous OG Kush phenotype — with Critical Mass, one of the most reliably productive strains ever bred. The result is a 90% indica that inherits Critical Mass's freakish yield potential and Confidential OG's potency and flavour depth.
This strain has picked up recognition at cannabis competitions, which tells you something about the quality of the genetics. The Kush Brothers don't rush their breeding process — only plants that genuinely hold up through extensive testing make it into the final cross. That selectivity shows in the consistency you get from seed to seed.
MassKush Growing Specs and Yield Potential
MassKush produces up to 600g/m² indoors and up to 1000g/plant outdoors, making it one of the heaviest-yielding indica strains you can grow from seed. Here's what you're working with:
| Specification | Detail |
|---|---|
| Seed Bank | The Kush Brothers Seeds (Barcelona) |
| Genetics | Confidential OG x Critical Mass |
| Type | Feminised |
| Indica / Sativa | 90% Indica / 10% Sativa |
| Indoor Flowering Time | 8 weeks |
| Outdoor Harvest | Late September |
| Indoor Yield | Up to 600g/m² |
| Outdoor Yield | Up to 1000g/plant |
| Pest Resistance | Strong (fungi and common pests) |
| Seeds per Pack | 3 |
The 8-week indoor flowering period is on the faster side for a strain that yields this much. Most comparable heavy producers push 9-10 weeks, so you're saving real time per cycle. Outdoors, the late September harvest window means you're pulling plants before the worst of autumn weather hits — a genuine advantage if you're growing in northern Europe or anywhere with shorter summers.
MassKush Flavour and Terpene Profile
Crack open a cured MassKush bud and the Critical Mass parentage hits you immediately: dank, sweet, earthy notes that smell like proper old-school cannabis. There's nothing trendy or gimmicky about this terpene profile — it's a classic, heavy indica scent that fills a room. The sweetness sits underneath a thick earthiness, with just enough depth to keep things interesting across a full cure.
If you've grown Critical Mass before, you'll recognise the backbone of this aroma. The Confidential OG side adds a subtle layer of complexity — a slightly sharper, more resinous edge that rounds out the sweetness. It's the kind of profile that cannabis connoisseurs appreciate precisely because it doesn't try to be something it's not. Honest, dank, satisfying.
Why MassKush Cannabis Seeds Are Worth Growing
We've seen plenty of strains that promise huge yields but demand perfect conditions to get anywhere near the advertised numbers. MassKush is different. The 90% indica genetics produce stocky, vigorous plants with thick stems and a natural resistance to pests and fungi. This isn't a strain that throws a tantrum if your humidity drifts 5% off target or your night temperatures dip lower than planned.
That resilience makes MassKush a genuinely good choice for less experienced growers who want impressive results without babysitting their plants through every stage. It also makes it a strong outdoor option in cooler, damper climates where mould-prone strains would struggle. We'd pick MassKush over most heavy-yielding alternatives if the grow space isn't climate-controlled to perfection.
The honest limitation? With buds this dense and heavy — especially outdoors where you're pushing towards that 1000g/plant mark — you'll want to support branches in late flower. Heavy indica colas can snap stems if you're not paying attention. A few bamboo stakes or a trellis net solve this completely, but it's worth knowing before you plant.
Compared to growing straight Critical Mass, MassKush adds the OG potency and flavour complexity that Critical Mass sometimes lacks. Compared to most OG Kush varieties, you're getting dramatically higher yields without sacrificing the quality of the end product. It sits in a sweet spot that's hard to find.
How to Grow MassKush Seeds
- Germinate your MassKush feminised seeds using the paper towel method or directly in a starter plug. Maintain temperatures around 22-25°C and keep the medium moist but never waterlogged. Taproots typically emerge within 24-72 hours.
- Transplant seedlings into their final containers once the first set of true leaves appears. For indoor growing, 11-15 litre pots work well. Outdoors, go bigger — 25 litres or more, or plant directly in the ground for maximum root expansion and those 1000g/plant yields.
- During vegetative growth, MassKush responds well to topping and LST (low-stress training). The naturally stocky indica structure means you can create a wide, even canopy without much effort. Expect vigorous, bushy growth.
- Switch to a 12/12 light cycle indoors to trigger flowering. Outdoors, MassKush will begin flowering naturally as daylight hours decrease in late summer. The 8-week flowering period starts from the first visible pistils.
- In the final 2-3 weeks of flower, support heavy branches with stakes or netting. MassKush produces dense, weighty colas that can stress branch joints. Monitor humidity closely during this period — dense buds in high humidity invite mould, even on a mould-resistant strain.
- Harvest when trichomes show a mix of milky and amber colouration under magnification. Dry slowly in a dark, ventilated space at 18-20°C and 55-60% relative humidity for 7-10 days, then cure in airtight jars for at least 2 weeks.
Growing MassKush indoors? Pair your seeds with a complete grow tent kit — tent, lighting, ventilation and carbon filter in one package. For outdoor growers, a quality pH meter and organic soil amendments will help you push towards those maximum yields.
MassKush vs Other Heavy-Yielding Cannabis Seeds
To put MassKush in context, here's how it stacks up against two other popular high-yield strains:
| Feature | MassKush | Critical Mass (standard) | Big Bud |
|---|---|---|---|
| Genetics | Confidential OG x Critical Mass | Afghani x Skunk #1 | Afghani x Skunk #1 x Northern Lights |
| Indica % | 90% | 80% | 85% |
| Indoor Yield | Up to 600g/m² | 450-550g/m² | 400-500g/m² |
| Outdoor Yield | Up to 1000g/plant | 500-800g/plant | 500-700g/plant |
| Flowering Time | 8 weeks | 8 weeks | 8-9 weeks |
| Pest Resistance | Strong | Moderate | Moderate |
| Flavour Profile | Dank, sweet, earthy with OG complexity | Sweet, earthy | Sweet, fruity |
MassKush outperforms both on yield potential and pest resistance. The OG Kush genetics also give it a flavour edge that straight Critical Mass crosses often miss. If you want the best yield-to-effort ratio in an indica seed, MassKush is hard to beat.
Frequently Asked Questions
Is MassKush suitable for beginner growers?
Yes. The 90% indica genetics produce robust, forgiving plants with strong pest and fungal resistance. MassKush can handle imperfect conditions better than most high-yielding strains, making it a solid first grow.
How much does MassKush yield indoors?
Up to 600g/m² under good conditions. Even with a basic setup, you should see well above average returns thanks to the Critical Mass genetics driving bud production.
Can I grow MassKush outdoors in a cool climate?
Absolutely — it's one of the better choices for northern European climates. The late September harvest means you're done before the worst weather, and the natural pest resistance handles damp conditions well.
What does MassKush smell and taste like?
Dank, sweet and earthy — classic indica flavours inherited from the Critical Mass side. The Confidential OG adds a sharper, resinous edge. Think old-school, proper cannabis rather than anything dessert-flavoured.
How long does MassKush take to flower?
8 weeks from the start of the flowering phase indoors. Outdoors, expect to harvest in late September. That's faster than many strains with comparable yield potential.
Do I need to support MassKush branches during flowering?
We'd strongly recommend it. The dense, heavy colas — especially on outdoor plants pushing towards 1000g — can snap branches in late flower. Bamboo stakes or a SCROG net sort this out easily.
Are MassKush seeds feminised?
Yes. Every seed in the pack is feminised, so you won't need to identify and remove males. All 3 seeds should produce female, bud-producing plants.
Last updated: April 2026
Related products
You might also like
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.