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30 day autoflower seeds

20 FASTEST Flowering Strains to Grow from Seed

Fastest Flowering Autoflower Strains

Sour Crack Auto

THE FASTEST autoflowering strain that Mephisto Genetics has ever grown, Sour Crack Auto finishes in only 7 weeks from seed (germination). Sour Crack Auto is made from Green Crack Auto and 24 Carat genetics. The short plants stay 20 to 28 inches tall, forming rock hard, resinous buds in quick time. A great strain for commercial quality Sea of Green autoflower grows. High potency nuggets tested near 20% THC.

Grow Time 7 weeks from seed
Strain Breeder Mephisto Genetics
Pack Size 1/3/7/18 seeds
Yield Indoors: 30–60 g/plant
Outdoors: 60+ g/plant

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+ Speed Auto

+ Speed Auto by Sweet Seeds are among the quickest finishing autoflower seeds to grow, being ready to harvest at just 7 weeks from germination. This strain is comprised of the breeder’s own Critical Mass and Speed Devil #2 Auto genetics, bred for yield and deep aromatic properties. + Speed Auto does well both indoors and outdoors. The plants grow 20 to 35 inches in height, producing harvests up to 150 grams each. Tastes sweet, fruity and cheesy.

Grow Time 7 weeks from seed
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 350–500 g/m2
Outdoors: 30–150 g/plant

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Fast Bud #2 Auto

Fast Bud #2 improves upon Sweet Seeds’ Fast Bud line, a member of the Diesel family of cannabis. This award-winning sativa dominant autoflower strain is quick to mature at 7 to 8 weeks from seed. Only reaching 20 to 35 inches in height, the short plants are multi-branched and form a large number of bud sites, making it an easy strain to grow with very productive yields. Fast Bud #2 Auto has a sweet aroma, exotic taste, strong head high and powerful body stone. 15–20% THC.

Grow Time 7–8 weeks from seed
Strain Breeder Sweet Seeds
Pack Size 3/5/10 seeds
Yield Indoors: 350–500 g/m2
Outdoors: 20–70 g/plant

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Sweet Skunk Auto

Sweet Skunk Auto is one of Sweet Seeds’ best yielding and most resinous autoflower weed strains. Genetically, it’s a hybrid of Early Skunk and Critical Mass, backcrossed twice to Early Skunk. The plants grow rapidly and get 24 to 35 inches tall, finished at just 7½ weeks from germination. Its buds are dense and covered in trichomes. Intense skunk aromas with a sweet and spicy background. Physically relaxing with an uplifting head high. 16–20% THC.

Grow Time 7½ weeks from seed
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 400–550 g/m2
Outdoors: 35–150 g/plant

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Alaskan Purple Auto

Alaskan Purple Auto by Seedsman, one of the best seed banks, is a 90% indica purple weed strain that produces good yields in short time. It finishes growing at 8 weeks from seed, with some phenotypes ready to harvest at week 7. They are easy growing, sizable plants for an autoflowering strain that mature one week later when grown outdoors. Ripe, fruity sweet flavors and 15–20% THC content.

Grow Time 7–8 weeks from seed
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield Indoors: 400–550 g/m2
Outdoors: 40–200 g/plant

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Crystal Candy XL Auto

Crystal Candy XL Auto is a large autoflowering marijuana strain, bred from tall phenotypes of Sweet Seeds’ Crystal Candy Auto line. This mostly sativa variety is suitable for both indoor and outdoor growing. The plants reach a height of 35 to 55 inches, ready for harvest at only 8 weeks from seed. Its buds are packed with trichomes and have a very fruity scent. 14–19% THC.

Time 8 weeks from seed
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 425–650 g/m2
Outdoors: 60–300 g/plant

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Sweet Gelato Auto

Sweet Gelato Auto by Sweet Seeds is an autoflowering version of one of the most prestigious cannabis strains from the Bay Area—Gelato (Sunset Sherbet x Girl Scout Cookies “Thin Mint”)—crossed to Killer Kush Auto. The resulting plants offer generous yields in just 56 days from germination. Its dense buds are covered in large trichomes. The scent is earthy, sweet and fruity with hints of mint and citrus. 18–23% THC.

Grow Time 56 days from seed
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 375–500 g/m2
Outdoors: 50–175 g/plant

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Sweet Cheese XL Auto

Sweet Cheese XL Auto is a fast and furious Cheese strain that offers greater size, yield and resin production than Sweet Seeds’ original Sweet Cheese Auto. This mostly sativa strain autoflower is ready to harvest at 8 weeks from seed, growing to a height of 30 to 55 inches. It has an intense, remarkably sweet, skunky scent and powerful yet relaxing high. 15–20% THC.

Grow Time 56 days from seed
Strain Breeder Sweet Seeds
Pack Size 3/5/25/100 seeds
Yield Indoors: 375–600 g/m2
Outdoors: 45–190 g/plant

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Purple Punch Auto

Purple Punch Auto is a fast, productive and flavorful autoflower variety sold by Barney’s Farm Seeds. A top performer indoors and out, this low-maintenance, mostly indica strain shows resistance to mold, mildew, mites and cold weather. The plants max out at 31 inches tall over their short lifecycle that takes between 50 to 60 days from seed. Its colorful, dense buds are rich in resin and terpenes with scents of sweet apple pie and cloves. Up to 18% THC.

Grow Time 50–60 days from seed
Strain Breeder Barney’s Farm Seeds
Pack Size 1/3/5/10 seeds
Yield Indoors: 350 g/m2
Outdoors: 400 g/plant

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Chocolate Skunk Auto

A “60 day wonder” strain being ready to cut 60 days from seed germination, Chocolate Skunk Auto by 00 Seeds is an autoflowering hybrid of Chocolate Skunk and ruderalis genetics. The plants grow large for an auto strain at over 40 inches tall. Chocolate Skunk Auto produces beautiful compact, crystal-covered buds that smell great. 17% THC.

Grow Time 60 days from seed
Strain Breeder 00 Seeds
Pack Size 3/5 seeds
Yield Indoors: 250–350 g/m2

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Fastest Flowering Photoperiod Strains

Gigabud

Gigabud is a Big Bud and Northern Lights hybrid that finishes flowering in a speedy 5 to 6 weeks. These thirsty, medium-sized plants grow vigorously in veg and flower, producing massive quantities of resinous, fruity buds. There is also an autoflowering Gigabud strain for sale.

Flowering Time 5–6 weeks
Strain Breeder G13 Labs
Pack Size 5 seeds
Yield 450+ g/m2

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Hash Plant

The famous Sensi Seeds Hash Plant indica originates from Afghani genetics bred in the Northwest United States that were brought to Sensi Seeds in Holland, where it was crossed to another Afghan variety—Northern Lights. Ready to harvest in as quick as 40 days from flowering, Hash Plant seeds grow fast, in a stout, thick manner. The buds are super dense, very sticky and ideal for making hash. A good choice for breeders.

Flowering Time 40–45 days
Strain Breeder Sensi Seeds
Pack Size 10 seeds
Yield 400–500 g/m2

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Green Poison Fast

Green Poison Fast by Sweet Seeds is a top quality weed strain which forms super frosty and tight buds. This unique feminized seed strain was made by breeding out the ruderalis gene present in the original autoflowering Green Poison to create a remarkable, high yielding photoperiod variety. 70% indica genetics are responsible for its fruity, heavy and dank marijuana buds.

Flowering Time 6 weeks
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 500–600 g/m2
Outdoors: 500–700 g/plant

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Passion #1

Passion #1 is an outdoor indica strain from the seventies in California, which made its way over to Holland during the eighties. This stable, easy to grow regular seed strain gets huge both outdoors and indoors, finishing its flowering cycle in a mere 6 weeks of bloom time. Passion #1’s citrus-like buds are long, dense and full of resin. 18.6% THC content.

Flowering Time 6 weeks
Strain Breeder Dutch Passion
Pack Size 10 seeds
Yield 250–750 g/plant

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Tropicanna Poison F1 Fast

Tropicanna Poison F1 Fast by Sweet Seeds is an excellent fast flowering strain bred for speed and potency. It was created using an elite Tropicanna Cookies clone crossed to a red flower phenotype and Red Poison Auto. Roughly 80% of the resulting plants get red bud coloring. This very productive variety is finished at only 6 to 7 weeks of bloom. The buds are dense, extremely resinous and have intensely sweet scents and flavors. 16–24% THC.

Flowering Time 42–49 days
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 450–600 g/m2
Outdoors: 400–650 g/plant

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Big Nugs Fast

As the name suggests, Big Nugs Fast grows big nugs—fast. It’s a photoperiod hybrid that’s ready to harvest in only 6 to 7 weeks flowering time. This high yield weed strain is bred from Big Bud / Critical Mass (Afghani x Skunk) crossed to Seedsman’s fast finishing male. Similar to Big Bud, Big Nugs Fast grows thick heavy buds, which may need to be propped up during flowering. Yields are high—expect dense, pine cone-shaped buds with fruity, hashy qualities.

Flowering Time 6–7 weeks
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield 450–550 g/m2

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C99 x Blueberry Fast

C99 x Blueberry Fast is a rapid flowering, mostly sativa weed strain that’s ready to harvest in just 45 days from the start of bloom cycle. The infamous C99 strain is crossed to Blueberry and then bred with Seedsman’s fast parent, resulting in sativa dominant seeds that finish quick. Its Thai genetics present help C99 x Blueberry Fast grow big during flowering, so expect some stretching. High yields of thick, potent marijuana buds.

Flowering Time 6–7 weeks
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield 350–450 g/m2

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Gorilla Girl F1 Fast

Gorilla Girl F1 Fast by Sweet Seeds is an extra-fast version of Gorilla Girl featuring extreme potency and production. The sativa dominant plants are ready to harvest after just 7 weeks of flowering. Its buds are known for their high resin content, with calyxes completely covered in frosty trichomes. The aroma and taste are sweet and fruity with earthy, woody notes. Strong effects—up to 24% THC.

Flowering Time 49 days
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 400–500 g/m2
Outdoors: 350–600 g/plant

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Pineapple Express #2

Pineapple Express #2 is a faster flowering, higher yielding version of G13 Lab’s original Pineapple Express. A favorite weed strain among growers in humid climates, Pineapple Express #2 grows huge outdoors and has high resistance to mold and moisture. Its buds are large, fruity and full of trichomes.

Flowering Time 45–50 days
Strain Breeder G13 Labs
Pack Size 5 seeds
Yield Indoors: 700 g/m2
Outdoors: 900–1300 g/m2

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Pakistan Valley

Originating from the Hindu Kush mountains, Pakistan Valley by WOS is a landrace pure indica cannabis strain that grows quick, finishing its flowering phase in just 45 to 55 days. A compact, vigorous grower, especially suited towards dry climates where its buds bulk up dense and resinous. Super sticky and potent—over 20% THC. For sale as both regular and feminized seeds.

Flowering Time 45–55 days
Strain Breeder World of Seeds
Pack Size 10 seeds
Yield Indoors: 400 g/m2
Outdoors: 700 g/m2

Buy Pakistan Valley Reg / Fem Seeds🌱

Disclaimer: Know your laws. Read federal and local/county laws before buying seeds online. We do not promote or undertake in illegal activities.

11 thoughts on “20 FASTEST Flowering Strains to Grow from Seed”

Consider Bubba’s gift from Humboldt seeds. 6 weeks flowering and nice purple hues

Im growing Bubbas Gift this season and it hasnt started to show sex yet. Just hope its done before the 1st week of October. Weather in the North East US can get really crappy in Oct . Anybody else out there have experience with this strain?

Speedy Chile fast by royal Queen is the fastest I’ve heard of. It’s finished in 56 days from germination and only needs 14 days veg. 16% Thc. Fem photo 80-100cm tall and 500+ grams per m2 indoor. Critical poison fast should be on the list too. Finished in 40-45 days 18% thc Fem photo 500+ grams per m2 indoor.

HI bro, how many plants per m2 can u grow with these??

Wow. This is a real treat for both the consumers and the farmers. Personally, I like Green-O-Matic Auto. It sorts of suits me. Thanks a lot for sharing.

Pineapple Express #2 from G13 Labs all day on my 3rd run with this strain and I have more chasing it

Bro, i have a special pheno of her, been runnin her for like 4 years now.. Its amazing what she does in just 50 days… I like to run an extra 10 days though…

got some free seeds from just cannabis seeds and so I thought I would throw a few of them in the dirt, only one was fem and a hearty little sativa that I topped 3 times for max yield and about 45 days in it looked like I was well on my way to getting 1/2 lb off of her when the buds fattened up in coming weeks considering I had about 4 more weeks before harvest, but just for fun I thought I would check the trichomes at a time I felt was early, and WTF. I’m sitting on 15 to 40% amber and no clear trichomes, in 45 days, on a pure sativa!! Well my yield wont be as big but its an early surprise. Wish I would have cloned her,

Just leave a couple small buds and regenerate growth after your harvest.

Lemon Pie Auto takes 3 months/12 weeks seed to buds

Both autoflowering seeds and photoperiod strains. The fastest flowering cannabis strains to grow from seed to harvest. Ordered by quickest start to finish

What Are Autoflowering Seeds?

What Are Autoflowering Seeds?

Contents:

Autoflowering cannabis seeds produce plants that flower on their own after 2–4 weeks of growth. Growers don’t need to worry about switching the light schedule to initiate and maintain the flowering phase, like they would if growing feminized photoperiod cannabis.

Autoflowers also need much less time to grow. Some varieties are ready to harvest in a short 8 weeks after sprouting. Plus, autoflowers are compact, which makes them great for indoor growing. Because they are so convenient, autoflowers are (not just) ideal for beginners to cannabis cultivation. More experienced growers can also take advantage of the unique growing traits of autoflowering cannabis.

Non-Photoperiod Strains: What Does It Mean?

Feminized (photoperiod) cannabis plants flower depending on the hours of light they receive. Out in nature, they start to bloom when the days get shorter at the end of summer. Indoors, cultivators initiate flowering by adjusting their grow lights to 12 hours of light and 12 hours of darkness.

In contrast, autoflowering strains flower based on age, independent of light hours, which means they are non-photoperiod strains. Autoflowers have several noteworthy characteristics:

  • Plants flower automatically after 2–4 weeks.
  • The average period between planting and harvest is 10 weeks.
  • Autoflowering seeds are also feminized. No need to worry about male plants.
  • Plants stay small (30–100cm).
  • They don’t attract too much attention. Ideal for stealthy grows.
  • You can harvest several crops per season.

Particularities of Autoflowers

The autoflowers that first appeared on the market in the early 2000s didn’t really impress. They weren’t very potent, their aroma was lacking, and their yields were not great either.

But autoflowers have come a long way since then. Modern autoflowers rival feminized photoperiod strains (and some even surpass them) in terms of potency, yield, and aroma. Yet, they still provide the same great benefits as mentioned above, along with having a reputation for being particularly stable and sturdy.

These days, autoflowers can satisfy even the most demanding of users: Recreational users won’t have difficulties finding automatic varieties rich in THC, and holistic users can get autoflowers low in THC but high in CBD to benefit from the non-psychoactive cannabinoid.

How Are Autoflowering Plants Created?

Autoflowering strains are created by crossbreeding indica or sativa plants with ruderalis. Ruderalis is a wild subtype of cannabis that grows in regions where the summer is very short but features many hours of daylight (e.g. Northern Europe or Siberia). These plants have evolved to not rely on daylight hours to flower, instead flowering according to age.

  • Ruderalis on its own isn’t too useful: Its buds won’t produce a high, and the plants are small with low yields. However, breeders discovered that they could crossbreed high-quality indica and sativa strains with ruderalis to make them autoflowering. This has revolutionised cannabis cultivation by fusing the best traits of all the cannabis subspecies.

Who Uses Automatic Cannabis Strains, and Why?

  • Growers: Growers like autoflowers because they are convenient and easy, producing a fast harvest with decent yields. With their compact size, they are among the best plants for growing in small spaces—great for micro-grows or putting a plant or two on a balcony. They also make good strains to grow outdoors as they are resilient and robust. Plus, their small size makes them a good choice for stealthy guerrilla grows.
  • Smokers: Recreational users can enjoy autos just like feminized photoperiod cannabis. If you’re smoking for the high, which can be anything from relaxing to uplifting, fun, and giggly, you can find the right autoflower to suit your tastes! Some autoflowers are slightly lower in THC than the average strain, making them ideal for people who like a milder and more balanced effect when smoking cannabis.

Who Uses Automatic Cannabis Strains, and Why?

Who Uses Automatic Cannabis Strains, and Why?

The Influence of Terpenes in Autoflowering Strains

Terpenes are the aromatic compounds in cannabis. Each strain has a different terpene profile, which gives them their distinct aromas and tastes. So, if you’re smoking your autoflower buds and you can taste or smell citrusy, flowery, fruity, skunky, or even fuel notes, this is due to the distinct terpene profile of your strain. It is also suggested that terpenes do more than offer appealing tastes and smells; they may even influence the effect a strain has.

Popular Autoflowering Cannabis Strains

Here are some of the most popular autoflowering varieties based on well-known cannabis strain families.

Lowryder (Quick One, Diesel, Solomatic CBD)

Lowryder was the very first “commercial” autoflower, released in the early 2000s. Based on these legendary genetics are Royal Queen Seeds’ Quick One, Diesel Automatic, and Solomatic CBD—the latter of which is aimed toward holistic users, as it contains 21% CBD and less than 1% THC.

Kush (Bubble Kush Auto, Royal Kush Auto)

The “mother of all indicas”, Kush is also well-represented in the autoflowers you can get at Royal Queen Seeds. Check out the fruity Bubble Kush Auto or Royal Kush Auto, both autoflowering variants of classic strains.

Haze (Amnesia Haze Auto, Royal Haze Auto, Royal Jack Auto)

The famous Haze family of strains provides a cerebral buzz that makes it top for daytime smoking. RQS has autoflowering variants of the classic Hazes, including Amnesia Haze and an autoflowering Jack Herer called Royal Jack Auto. Royal Haze Auto is a cross between Amnesia Haze, Skunk, and ruderalis.

Afghan (AK Auto, NL Auto, Critical Auto)

Enjoyed in the Middle East for centuries, Afghan is another classic cannabis variety loved by smokers and growers alike. Enjoy the relaxing effects and spicy notes of RQS’ AK Auto, Northern Lights Auto, or Critical Auto, along with their great yields.

Cookies (Gorilla Auto, Cookies Auto)

From the West Coast of the US hails the immensely popular Cookies family of strains—famous not just for their sweet dessert flavours, but also their uplifting and social effect. Some of the best autoflowers with Cookies genetics are Royal Queen Seeds’ Gorilla Auto (based on the ultra-potent Gorilla Glue) and Cookies Auto.

Blueberry (Haze Berry Auto, Bluematic)

Renowned for their sweet berry notes is the famous “Blue” family of cannabis. Originally from the US West Coast, Blueberry has been infused into two popular RQS offerings: Haze Berry Auto combines Haze Berry and Blueberry Auto, while Bluematic is the automatic variant of the original Blueberry.

Purple (Purple Queen Auto, Purplematic)

Made from select Kush varieties from Afghanistan and Pakistan, the Purple family of cannabis features plants with a gorgeous appearance. Purple Queen Auto is an automatic variant of Purple Queen, and Purplematic CBD has 17% CBD and only trace amounts of THC for a clean and clear high.

Banana (Fat Banana Auto)

What do you get when you add Cookies genetics to one of the fruitiest Kushes, Fat Banana? That’s right, you get an incredibly fruity cannabis delight. With 22% THC, this one is also remarkably potent, providing a double-whammy for cannabis aficionados.

Gelato (Green Gelato Auto)

Lovers of great Cali weed won’t say no Green Gelato Auto by RQS. This girl was made by combining Green Gelato with an autoflowering Girl Scout Cookies. The result: an incredible aroma and mind-blowing potency (24% THC).

Skunk (Royal Dwarf, Sweet Skunk Automatic)

No list of good cannabis would be complete without the legendary Skunk family. Royal Dwarf blends ruderalis with Skunk, while Sweet Skunk Automatic adds autoflowering magic to Early Skunk and Critical. Spicy and skunky flavours galore!

Cheese (Royal Cheese Auto, Blue Cheese Auto, Fast Eddy)

For all the fans of the famous Cheese from the UK, Royal Queen Seeds has you covered as well: Royal Cheese Auto has a spicy taste and provides a deep stone. Fast Eddy Automatic CBD is also made with these legendary UK genetics: Low in THC (9%) and rich in CBD, she provides a clear and mellow high.

How to Grow Autoflowering Seeds

Use light, well-draining soil

For autoflowers, you want soil that is even lighter than that used to grow feminized photoperiod cannabis plants. If needed, amend your soil with perlite to increase airiness and drainage.

Indoors vs outdoors

Indoors: No need to switch your lights to a flowering schedule like with photoperiod cannabis. You can keep your autoflowers on an 18/6 (18 hours of light, 6 hours of darkness) or 24/0 light schedule from seed to harvest.

Outdoors: You are not as beholden to the natural seasons as with photoperiod plants. You can plant your autos at any time of the year, provided there is no frost. Harvest 8–10 weeks after planting. If you plant your autoflowers several weeks apart, you can achieve several harvests per year! Autoflowers are stealthy and compact. This makes them perfect for low-key outdoor operations.

How much time do you need to grow autoflowers?

It depends on the strain. But in general, autoflowers will be ready much quicker than feminized photoperiod cannabis. The average life cycle of autoflowers is about 10 weeks, with some strains ready as soon as 8 weeks after germination.

Can you grow feminized photoperiod and autoflowering cannabis in the same grow room?

You can, but it isn’t optimal. One issue can be the difference in size between the two types. The other is that you’ll need to switch your lights to 12/12 to flower your photoperiod plants, meaning your autos will get less than the recommended 18 or 20 hours, and your yields will be smaller as a result.

Optimal temperature and humidity for growing autoflowers

Keep your grow room’s temp at a moderate 21°C (room temperature) for healthy growth. Colder temperatures or excessive heat can lead to growing problems. For best results, grow in an environment where you can maintain full control. Use heating and/or cooling if necessary.

Optimal humidity for your autoflowers depends on your plant’s age. In the first few weeks, they prefer a more humid environment. Reduce relative humidity to 40–50% when your plants start to flower to reduce the risk of mould.

How to Grow Autoflowering Seeds

How to Grow Autoflowering Seeds

What kind of nutrients do autoflowers need?

In general, autoflowers are smaller than feminized photoperiod cannabis. Smaller plants require less nutrients than large plants.

If you’re using commercial cannabis nutrients, give only ½ or ¼ of the recommended dose to your autoflowers. When using commercial potting mixes that are pre-fertilised, you will likely not need to feed until your autoflowers start to bloom, at about week 3 or 4.

What kind of water for autoflowers?

With autoflowers being smaller and having a smaller root system, they will also drink less than large feminized photoperiod plants. Don’t overwater, and allow the soil to dry out between waterings.

When growing in soil, the optimal pH level of your water/nutrient solution is 6–7. You can adjust your water to the correct pH level using natural pH “up” or “down” products.

What about plant training with autoflowering cannabis?

Plant training techniques such as topping, FIM, super cropping, and defoliation are not recommended for autoflowers. Any training that involves damage to your plants will temporarily slow or halt their growth and requires time for recovery—time that autoflowers don’t have (given their limited lifespan). You’d end up with greatly diminished yields.

On the other hand, you can try gentle plant training such as LST (low-stress training), where you bend down the stems and branches to create an even canopy and optimise light exposure. Skip the parts that involve any cutting or pinching.

Get the scoop on autoflowering cannabis seeds. Find out what autoflowering seeds are and get tips on how to grow autoflowering cannabis indoors and outdoors.