Critical+ 2.0 Autoflowering

Critical+ 2.0 Autoflowering Cannabis Seeds by Silent Seeds

Critical+ 2.0 Autoflowering is a feminized autoflowering cannabis seed from Silent Seeds that delivers fat, dense buds in just 70–80 days from germination. Silent Seeds spent two full years reworking this strain before they were happy enough to release it — and the result is a noticeably thicker, tighter, more resinous plant than the original Critical+ Auto. If you've grown the first version, you'll spot the difference immediately: more orange pistils, bigger colas, and a branching structure that actually fills out properly. The Skunk heritage is alive and well here, which means your nose will know about it long before harvest day. You can buy Critical+ 2.0 Autoflowering seeds in packs of 3, 5, or 10 from Azarius.

What Makes Critical+ 2.0 Auto Different from the Original?

Critical+ 2.0 Auto produces measurably denser buds, more productive lateral branches, and a taller overall structure than the original Critical+ Auto. Silent Seeds didn't just slap "2.0" on the packet and call it a day. They crossed the original Critical+ Auto genetics back, selected over multiple generations, and came out with a plant that's taller, bushier, and significantly higher-yielding. The original was already a solid performer, but the 2.0 version develops a much denser network of lateral branches — those secondary bud sites that used to stay wispy now actually fill in with proper, compact flowers.

The buds themselves are visibly different. More orange, more pistils, tighter structure. Where the original sometimes produced slightly airy lower buds, the 2.0 packs them in. The genetics sit around 60% indica and 40% sativa with ruderalis parentage for the autoflowering trait, giving you a plant that stays manageable in height (60–130 cm) but doesn't sacrifice on flower production. THC levels come in around 20% with approximately 3% CBD — a ratio that leans heavily towards potency but keeps a touch of cannabinoid breadth. According to research published in PMC (PMC8290527), cannabinoids and terpenes are among the most active compounds in the cannabis plant, and this strain produces plenty of both.

One thing that absolutely did not change: the smell. This plant reeks. The Skunk lineage is loud and proud, and if you're growing indoors without a proper carbon filter, your entire building will know what you're up to. We'd go so far as to say this is one of those strains where a basic carbon filter isn't enough — you want a properly rated one, ideally oversized for your tent. We've heard from growers who thought their filter setup was sorted, only to find the Critical+ 2.0 overwhelmed it by week five of flower.

Growing Critical+ 2.0 Autoflowering Seeds

Critical+ 2.0 Autoflowering completes its full lifecycle in 70–80 days from germination without any light schedule change. Autoflowering means this plant runs on its own internal clock — no need to switch light schedules from 18/6 to 12/12 to trigger flowering. You plant it, give it light (most growers stick with 18/6 or 20/4 throughout the entire cycle), and roughly 70–80 days later you're chopping. According to research on flowering time in Cannabis sativa (PMC9533707), flowering time significantly affects both yield and quality, and the autoflowering trait gives you a predictable, compact timeline that takes the guesswork out.

Indoors under hydroponics, Silent Seeds quotes up to 250 grams per square metre. In soil you'll likely land a bit below that, but the plant's branching structure means it responds well to light stress training (LST) if you want to open up the canopy. Outdoors, expect somewhere in the range of 50–150 grams per plant depending on your climate, pot size, and how much direct sunlight the plant gets. She's not fussy about growing medium — soil, coco, hydro all work — but she does drink and feed fairly heavily in the second half of the cycle when those buds are stacking on weight.

Height-wise, 60–130 cm gives you a wide range. In a small tent with limited vertical space, keep the light close and consider some gentle LST to keep her flat. In a taller setup or outdoors, she'll stretch more and develop that full branching structure that really maximises secondary bud production.

Specifications

How to Grow Critical+ 2.0 Auto: Step by Step

The full grow cycle from seed to harvest takes nine key steps, each one straightforward enough for a first-time grower.

1. Germinate your seeds. Use the paper towel method or plant directly into a small pot of moist, light soil or coco. Taproot usually appears within 24–72 hours.
2. Start in the final pot. Autos don't love transplanting — the root disturbance can stunt them. Plant into your final container (7–15 litres is the sweet spot) once the taproot is showing.
3. Set your light schedule. 18 hours on, 6 hours off is standard. Some growers push to 20/4. Either works — the plant doesn't need a dark period to flower.
4. Feed lightly in the first two weeks. Seedlings don't need much. Start introducing nutrients around week two, ramping up as the plant enters its vegetative growth spurt.
5. Apply LST if needed. Gently bend the main stem to open up the canopy. This encourages those lateral branches to develop fully — and with the 2.0's natural branching tendency, you'll see real results.
6. Switch to bloom nutrients around week four or five when you see the first pistils forming. The plant will stretch and then start stacking buds rapidly.
7. Monitor your carbon filter. Seriously. By week five or six the smell will be intense. Make sure your extraction fan is running properly and your filter is fresh.
8. Flush for the final 7–10 days with plain pH-adjusted water to let the plant use up stored nutrients. This improves the smoothness of the final product.
9. Harvest at 70–80 days when trichomes are mostly milky with a few turning amber. Dry slowly in a dark room at around 18–20°C and 55–60% humidity for 7–14 days, then cure in jars.

Smell, Flavour, and What to Expect

Critical+ 2.0 Auto is one of the most pungent autoflowering strains available, dominated by a classic Skunk terpene profile with sharp citrus undertones. The terpene profile leans heavily into that classic Skunk funk: sharp, musky, almost acrid sweetness that coats your nostrils and lingers on your clothes. There's a citrus undertone in there too, but it's buried under layers of dank. If you crack a jar of properly cured Critical+ 2.0 in a room, everyone in that room will have an opinion about it.

The buds themselves are dense, sticky, and absolutely caked in trichomes by harvest. The orange pistils are a standout visual feature — Silent Seeds specifically bred for larger, more abundant pistils in this version, and it shows. Break a bud open and the inside is tight, with minimal stem and very little fluff. This is the kind of bud that's satisfying to trim because there's not much to take off.

The honest limitation? The smell is genuinely hard to manage. If you're in a shared building, a flat, or anywhere with neighbours in close proximity, you need to take odour control seriously. A basic inline carbon filter might not cut it. We'd recommend an oversized filter rated for more air volume than your fan actually moves — that gives the carbon more contact time and better scrubbing. Even then, opening the tent for maintenance will release enough smell to make a room stink for hours.

Why Critical+ 2.0 Auto Is Worth Growing

Critical+ 2.0 Autoflowering offers one of the best yield-to-time ratios of any autoflowering strain currently on the market. The autoflowering seed market is packed with options, and plenty of them promise big yields and fast harvests. What sets Critical+ 2.0 apart is that Silent Seeds actually delivered on the rework. This isn't a token update — the two years of selective breeding produced measurably better bud structure, more productive lateral branching, and a plant that genuinely fills a canopy rather than just stretching towards the light with a single dominant cola.

For growers working in small spaces — a 60x60 or 80x80 tent — the 60–130 cm height range is manageable with a bit of training. For outdoor growers in northern European climates, the 70–80 day lifecycle means you can start in late spring and harvest in summer without worrying about autumn weather ruining your crop. And because the seeds are feminized, every seed you plant should produce a flowering female — no wasted space, no surprise males.

If you've grown the original Critical+ Auto and found it decent but underwhelming, the 2.0 is the upgrade you were waiting for. If you've never grown it at all and you want a reliable, heavy-yielding auto that doesn't require advanced growing skills, this is a strong choice. Compared to Royal Queen Seeds Easy Bud, which finishes faster but yields significantly less, the Critical+ 2.0 trades a couple of extra weeks for substantially heavier harvests and denser bud structure. Against Fast Buds Gorilla Cookies Auto, the yield numbers are comparable, but the Critical+ 2.0 tends to produce tighter, more compact flowers with less trimming required.

According to research on photoperiod effects and cannabis biomass yield (PMC10004775), optimising light exposure directly impacts cannabinoid concentration and flower weight. With autos, you get to run longer light hours throughout the entire cycle — a genuine advantage over photoperiod strains when it comes to maximising energy input per day of growth. Data from the EMCDDA confirms that cannabis potency in European markets has been trending upward, and strains like Critical+ 2.0 with approximately 20% THC sit comfortably within that higher-potency bracket.

Common Mistakes to Avoid with Critical+ 2.0 Auto

The most frequent mistakes growers make with this strain relate to timing, feeding, and odour management. We've seen growers stumble on a few recurring issues with this strain specifically:

• Transplanting too late. Start in your final pot. Moving an auto at day 14 can cost you a week of growth that you simply can't get back in a 70–80 day lifecycle.
• Overfeeding early. The 2.0 is a hungry plant in flower, but seedlings don't need heavy feeds. Burnt tips in week one means stunted growth for the rest of the run.
• Underestimating the smell. We can't stress this enough. Budget for a good carbon filter before you even order the seeds.
• Not training. The natural branching structure is good, but a bit of LST in the first three weeks will dramatically improve light penetration and even out the canopy. Skip it and you'll get one fat main cola and a bunch of smaller larf underneath.
• Harvesting too early. The 70–80 day window is a guide. Check your trichomes with a loupe — milky with 10–20% amber is the sweet spot. Chopping at day 65 because you're impatient will cost you weight and potency.

Frequently Asked Questions

Last updated: April 2026