Critical
Cannabis seeds
by Advanced Seeds
Critical Feminised Cannabis Seeds by Advanced Seeds
Critical by Advanced Seeds is a feminised indica-dominant hybrid that delivers branch-bending harvests of dense, resinous buds. Bred from a cross of Critical Mass, South Indian, and Brazilian genetics, this strain packs international vigour into a compact indoor plant or a towering outdoor specimen. With 16% THC, a flowering time of just 7-8 weeks, and yields pushing 450-500g/m², Critical is the workhorse strain that keeps growers coming back season after season.
What's in the Pack
This listing includes 3 feminised Critical seeds from Advanced Seeds. Feminised means no males to cull — every seed should produce a flowering female plant, so you're not wasting time or tent space on plants you'll only bin.
| Specification | Detail |
|---|---|
| Seed Bank | Advanced Seeds |
| Genetics | Critical Mass x South Indian x Brazilian |
| Type | Feminised |
| Dominant | Indica-dominant hybrid |
| THC Content | 16% |
| Indoor Height | 70-90 cm |
| Outdoor Height | 200-300 cm |
| Flowering Time (Indoor) | 7-8 weeks |
| Harvest Time (Outdoor) | Beginning of October |
| Indoor Yield | 450-500g/m² |
| Recommended Veg Period | Max 10 days (indoor) |
| Seeds Per Pack | 3 |
Growing Critical indoors? Pair these seeds with a complete grow tent kit — tent, lighting, ventilation, and carbon filter in one box. If you're after a different indica-leaning strain for comparison, have a look at Royal Queen Seeds' Critical as well. Running both side by side is a solid way to find your favourite phenotype.
Why Critical Seeds Deserve a Spot in Your Grow Room
There's a reason Critical genetics appear in half the seed catalogues in Europe — the original Critical Mass lineage is one of the most reliable yielders ever bred. Advanced Seeds took that foundation and crossed it with South Indian and Brazilian varieties, adding vigour and a touch of tropical resilience. The result is a plant that doesn't ask for much but gives back generously: 450-500g/m² indoors, with buds so fat and dense they can literally snap branches if you don't support them.
We'd pick this strain for anyone who wants a straightforward grow without sacrificing yield. It stays between 70-90 cm indoors — manageable in an 80x80 tent without aggressive training — and finishes flowering in 7-8 weeks. That's fast for the amount of bud you'll pull. Outdoors it's a different animal entirely, stretching to 200-300 cm and ready for the chop at the start of October. Southern European climates will get the best out of it outside, but it's forgiving enough to handle less-than-ideal conditions too.
The one thing to watch: keep your veg period to 10 days maximum indoors. Critical is vigorous. Give it three weeks of veg and you'll be fighting for headroom by mid-flower. We've seen growers underestimate this and end up with colas pressed against the light. Short veg, let it stretch in flower, and you'll be rewarded.
Flavour and Effect Profile of Critical Cannabis Seeds
Critical produces buds with a citrusy, sweet aroma that translates directly to the smoke. Think lemon zest mixed with a sugary undertone — pleasant on the inhale, smooth on the exhale. It's the kind of flavour that makes you want to roll another one purely for the taste, which is saying something for a strain primarily bred for yield.
At 16% THC, this isn't a face-melting powerhouse, and that's actually a strength. The effect is a deeply relaxed, full-body calm — the sort of stone that pairs with a sofa, a film, and absolutely zero plans. It's a proper wind-down strain. Good for quiet evenings, lazy weekends, or those moments when you just need your brain to stop running through tomorrow's to-do list. If you're after something that'll leave you functional enough to hold a conversation but relaxed enough not to care about the outcome, Critical hits that mark.
Honest limitation: if you're chasing 25%+ THC and a cerebral, energetic effect, this isn't it. Critical is an indica-dominant relaxer, not a sativa rocket. Know what you're growing and you'll love the result.
How to Grow Critical Feminised Seeds
- Germinate your Critical seeds using the paper towel method or directly in a starter plug. Keep the environment warm (22-25°C) and moist. Taproots typically emerge within 24-72 hours.
- Transplant seedlings into their final pots once the first set of true leaves appears. Critical thrives in soil, coco, or hydro — it's not fussy about medium.
- Keep the vegetative period to a maximum of 10 days indoors. This is critical (pun intended) for height management. The plant will stretch considerably during the first two weeks of flower.
- Switch to a 12/12 light cycle to trigger flowering. Expect 7-8 weeks from flip to harvest. Outdoors, flowering begins naturally as daylight hours decrease, with harvest around the beginning of October.
- Support heavy branches from week 4-5 of flowering onwards. Use bamboo stakes or a SCROG net. The buds on this strain get dense enough to bend and potentially snap branches — don't learn this the hard way.
- Flush your plants for the final 7-10 days before harvest to improve flavour. Harvest when trichomes are mostly milky with a few turning amber for that classic indica body effect.
- Dry in a dark, ventilated space at 18-20°C and 55-60% humidity for 7-14 days. Cure in glass jars for at least two weeks — longer curing brings out more of that citrus sweetness.
Indoor vs Outdoor: Where Critical Performs Best
| Factor | Indoor | Outdoor |
|---|---|---|
| Height | 70-90 cm | 200-300 cm |
| Yield | 450-500g/m² | High (plant-dependent) |
| Harvest Time | 7-8 weeks flowering | Beginning of October |
| Training Needed | Minimal — short veg controls height | Optional LST for bushier growth |
| Branch Support | Recommended from week 4-5 | Stakes or cages recommended |
| Best For | Small tents, SOG setups | Mediterranean climates, large gardens |
Indoors, Critical is one of the best strains for a Sea of Green setup. Keep veg short, pack them in at 9-16 plants per square metre, and each one will produce a single dominant cola loaded with dense flower. In an 80x80 tent, four plants with a slightly longer veg and some light LST will fill the canopy nicely.
Outdoors, this strain transforms. Given full sun and root space, Critical can reach 300 cm and produce enormous yields. The South Indian and Brazilian genetics give it enough heat tolerance for southern European summers, but it'll also do well in a greenhouse further north. Just make sure it's harvested before the autumn rains set in — those dense buds are mould magnets in wet conditions.
Frequently Asked Questions
How long does Critical take to flower indoors?
Critical finishes flowering in 7-8 weeks from the light flip. That's on the faster side for an indica-dominant hybrid producing this much bud. Some phenotypes may lean closer to 7 weeks, but give the full 8 if trichomes aren't ready.
Why should I keep the veg period to only 10 days?
Critical is a vigorous grower that stretches significantly during early flower. A veg period longer than 10 days indoors can result in plants outgrowing your tent. If you're growing in a space under 180 cm tall, stick to the 10-day maximum.
Do I need to support the branches during flowering?
Yes. Critical produces buds so dense and heavy that branches can snap under their own weight. Use bamboo stakes, a trellis net, or yo-yo hangers from week 4-5 of flowering onwards. This isn't optional — it's the one maintenance task you can't skip with this strain.
What does Critical taste like when smoked?
Expect a citrusy, sweet flavour profile — lemon zest with a sugary finish. The taste is more pronounced after a proper two-week cure in glass jars. It's a genuinely pleasant smoke, especially for a strain bred primarily for yield.
Is Critical suitable for beginner growers?
Absolutely. Critical is forgiving, grows well in any medium (soil, coco, hydro), and doesn't require advanced training techniques. The main thing to remember is keeping veg short and supporting branches in flower. Beyond that, it practically grows itself.
Can I grow Critical in a cold climate outdoors?
Critical can handle cooler conditions better than many strains thanks to its mixed genetics, but it performs best in warm, Mediterranean-type climates. In northern Europe, a greenhouse is your best bet — those dense buds are vulnerable to mould if exposed to autumn rain.
What yield can I expect from Critical seeds?
Indoors, expect 450-500g/m² under standard lighting conditions. Outdoors, yields vary depending on pot size, sunlight, and growing season length, but healthy plants in good conditions can produce impressive harvests well above that per-plant figure.
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.