Advanced Seeds is a Spanish seed bank that's been quietly turning out reliable, heavy-yielding genetics since 2004 — and we stock over 60 of their feminised and autoflowering strains at Azarius. Buy Advanced Seeds cannabis seeds for everything from classic Amnesia and Critical Mass to modern US-style hybrids like Gelato 33, Zkittlez and Rainbow Sherbet #11. Fair prices, strong germination rates, shipping across the EU since 1999.
Buy Advanced Seeds — The Full Range at a Glance
Advanced Seeds is a Malaga-based breeder that built its name on three things: consistency, yield, and sensible prices. If you're new to the brand and wondering where to start, the short answer is Critical Mass or Amnesia — both do most of the work for you. The rest of this page is about helping you pick the right packet for your grow, not selling you the most expensive one.
We've shipped Advanced Seeds out of Amsterdam for years, and the feedback from customers is boringly consistent: the beans pop, the plants look like the photos, the harvest weights are real. That's not a small thing in a market full of hype.
Quick strain picker — match the format to your grow
| If you want… | Format | Start with |
|---|---|---|
| Biggest possible harvest | Photoperiod feminised | Critical Mass, Amnesia, Gelato 33 |
| Seed-to-jar in under 11 weeks | Autoflower | Auto Amnesia XXL, Auto Critical Mass, Auto Gelato 33 |
| Photoperiod yields, shorter wait | Fast version | Amnesia Fast, Gelato 33 Fast, Critical Mass Fast, Zkittlez Fast |
| Modern US-style potency | Feminised hybrid | Animal Zookies, Slurricane, San Bacio Burger, Rainbow Sherbet #11 |
| Fruit-forward terpenes | Feminised or Auto | Somango Widow, Strawberry Gum, Mimosa Punch, Watermelon OG |
| Small tent / discreet grow | Compact indica autoflower | Auto Afghan Skunk, Auto Slurricane, Auto Banana Cookies |
| First grow ever | Forgiving feminised | Critical, Amnesia, Afghan Skunk |
What We Carry
- Classic feminised photoperiods — the workhorses: Amnesia, Critical Mass, Critical, Afghan Skunk. Big yields, proven genetics, no surprises.
- Modern US-style feminised hybrids — Gelato 33, Zkittlez, Gorilla Blue, Animal Zookies, Slurricane, Bruce Banner, San Bacio Burger, Rainbow Sherbet #11. Higher THC, dessert-and-diesel terpene profiles.
- Fruit and dessert strains — Somango Widow, Somango Glue, Strawberry Gum, Banana Cookies, Mimosa Punch, Watermelon OG, Zerealz Milk, Apple Fritter, Forbidden Fruit Cake.
- Fast versions — photoperiod genetics with ruderalis-shortened bloom. Amnesia Fast, Gelato 33 Fast, Critical Mass Fast, Zkittlez Fast, Critical Lemon Fast, Lemon Bean Fast. Two weeks quicker, no autoflower light schedule.
- Autoflowers — the biggest chunk of the range: Auto Amnesia XXL, Auto Critical Mass, Auto Jack Herer, Auto Gelato 33, Auto Zkittlez, Auto Slurricane, Auto Pineapple Glue, Auto Somango Glue, Auto Banana Cookies, Auto Mimosa Punch, Auto Watermelon OG, Auto Bruce Banner XXL, Auto Fire DOG, Auto Animal Zookies, Auto Apple Fritter, Auto Forbidden Fruit Cake, Auto Zerealz Milk, Auto Rainbow Sherbet 11, Auto Strawberry Gum, Auto Biodiesel Mass XXL, Auto Critical Soma, Auto Afghan Skunk.
- Purple and colourful phenos — Critical Purple Kush, Fire DOG, Forbidden Fruit Cake, Mimosa Punch, Watermelon OG. Cold night-time temps bring out the anthocyanins.
How to Choose Your Advanced Seeds Strain
First decision: autoflower or photoperiod. Autoflowers run on an 18/6 or 20/4 light schedule from seed to harvest and finish in 8–11 weeks regardless of what you do with the lights. Photoperiods need you to flip to 12/12 to flower, take 8–10 weeks of bloom on top of veg, and reward you with bigger yields and (usually) better terpenes. If this is your first grow, or you're dealing with seasonal outdoor timing you can't control, get an autoflower. If you want to maximise every square metre of a tent, get feminised photoperiod.
Second decision: indica, sativa, or balanced. The Advanced Seeds catalogue leans indica-dominant — Critical Mass, Slurricane, Fire DOG, Zkittlez, Critical Purple Kush all stay compact and finish fast. If you want a cleaner head effect and don't mind taller plants, Amnesia, Lemon Bean, Auto Jack Herer and OG Kush SFV are the sativa-leaners.
Third decision: flavour. This is where Advanced Seeds punches above its weight — the terpene profiles are genuinely distinct, not just "fruity" marketing. Somango Widow for mango, Strawberry Gum for actual strawberry bubblegum, Mimosa Punch for citrus-blueberry, Gelato 33 for dessert, Animal Zookies for cookie-dough-and-diesel. Order what you'd actually want to smoke — the plant will grow itself either way.
When in doubt: start with Critical Mass feminised or Auto Critical Mass. It's the strain that earned Advanced Seeds its reputation, it's forgiving of rookie mistakes, and it yields like nothing else in the price bracket.
Fast versions — the underrated middle path
Fast versions are Advanced Seeds' quiet specialty. They're photoperiod strains crossed with a ruderalis parent far enough back that they still need a 12/12 flip — but bloom finishes in 6–8 weeks instead of 9–10. You get photoperiod-level yields and terpene depth with two to three weeks shaved off the clock. Amnesia Fast, Gelato 33 Fast, Critical Mass Fast, Zkittlez Fast and Critical Lemon Fast are all worth a look if you want more harvests per year without switching to full autoflower.
Frequently Asked Questions
Are Advanced Seeds good quality?
Yes — they're one of the more consistent Spanish seed banks, known for high germination rates and strains that match their published specs. We've sold their genetics for years and the customer feedback is steady: big yields, honest descriptions, fair prices. Not the flashiest brand on the shelf, but one of the most reliable.
What's the best Advanced Seeds strain for beginners?
Critical Mass or Amnesia feminised for photoperiod growers, or Auto Critical Mass / Auto Amnesia XXL if you want an autoflower. All four are forgiving of watering mistakes, pH swings and less-than-ideal light, and they still deliver heavy yields. Afghan Skunk is the other obvious starter — short, sturdy and practically grows itself.
What's the difference between Advanced Seeds Fast versions and autoflowers?
Fast versions are photoperiod — you still flip the lights to 12/12 to flower them, but bloom finishes in 6–8 weeks instead of 9–10. Autoflowers flower on their own timer regardless of light schedule and finish seed-to-harvest in 8–11 weeks. Fast versions yield more per plant; autos are simpler and quicker overall.
Which Advanced Seeds strain has the highest THC?
Rainbow Sherbet #11 tops the photoperiod range at 29% THC, followed by Animal Zookies and Slurricane at 28%, Zerealz Milk at 28%, and San Bacio Burger at 27%. On the autoflower side, Auto Rainbow Sherbet 11 and Auto Animal Zookies both hit 27%. These are the modern hybrids — classics like Critical Mass and Amnesia sit in the 20–22% range.
Do Advanced Seeds ship to my country?
We ship Advanced Seeds across the EU from our Amsterdam warehouse under free movement of goods. Seeds are sold as souvenirs or collector items depending on the destination — check the shipping page for your country's delivery times and any format restrictions at checkout.
How many seeds come in an Advanced Seeds packet?
Standard packet size at Azarius is 3 feminised seeds per pack across the Advanced Seeds range. A few older SKUs are listed as single-pack defaults. Check the variant dropdown on the product page for exact counts before you order.
Last updated: April 2026