Fastest Seed To Harvest Weed

The fastest autoflowering strains with the shortest cycle from seed to harvest! Learn about Mimosa Cake Auto, Kosher Cake Auto and other 3 strains in our blog. Both autoflowering seeds and photoperiod strains. The fastest flowering cannabis strains to grow from seed to harvest. Ordered by quickest start to finish

The Top 5 Fastest Growing Autoflower Strains

Need seeds that give you buds fast? We’ve got you covered with our list of the fastest growing autoflowering marijuana strains.

  • 1. Mimosa cake auto
  • 2. Kosher cake auto
  • 3. Lsd-25 auto
  • 4. Blackberry auto
  • 5. Fastberry auto
  • 6. In conclusion

One of the largest reasons growers choose autoflowers is how fast they can mature from seed to chop. Autoflower seeds like Fast Buds’ are ready in 8-10 weeks, meaning you can harvest twice or even three times in the time it would take you to grow a photoperiodic plant.

Below, we break down the fastest growing autoflower strains from Fast Buds. If speed is what you’re after, you’ll find it here. Don’t forget to check out our guide detailing when is the best time to harvest autoflowering cannabis.

1. Mimosa Cake Auto

I grew one mimosa in my greenhouse. I honestly thought she’d take 11-12 weeks but harvested in 9 and the buds were so damn frosty. delicious!

One of the best Sativa-dominant strains on our list, Mimosa Cake kicks like a mule and is perfect for an active day out in the sun. It’s a sizeable yielder as well, being one of the most popular strains in California at the moment and amongst our highest yielding strains. Mimosa Cake usually hits full maturity around week eight or nine, offering up a lemony and floral bouquet of buds coated in resin.

When grown under the right conditions, this plant will boast beautiful purple colors on the buds and surrounding foliage, and thanks to the 24% THC, produce large-sized buds with lots and lots of resin, perfect for extractors and hash makers.

2. Kosher Cake Auto

It does what it says on the tin ,after slow start this plant just took over ,very nice aroma and perfect smoke just ideal for wake&bake

One of Fast Buds’ latest releases with a delicious lemony cake taste, Kosher Cake. With THC levels reaching 25% and CBD levels lower than 1%, this one-of-a-kind strain offers an experience like no other. The high THC levels provide a giddy euphoria and unreal relaxation without a couch-lock effect for those who don’t want to experience a narcotic type of effect.

This strain’s short growing time pairs well with its tall yet compact build, making it perfect for indoor growers. This unique variety matures around week eight or nine and is perfect for when you’re looking for something different and with a unique terpene profile.

3. LSD-25 Auto

Top notch strain. Easy to grow and produces prolific flowers. I got 6 ozs. of great medicine from her. I will definitely grow this strain again.

The crown jewel of the Fast Buds library, LSD-25’s purple flowers have to be seen to be believed. This dense Indica expresses a royal violet color that blows us away every time. Its diesel odor comes from a complex variety of terpenes that give this Indica the trippy effects for which it’s named.

LSD-25 reaches full maturity in eight to nine weeks and will blow away your smoking buddies not just with its effects, but its beautiful color as well. Thanks to its top-of-the-line genetics, the effect will take you to the moon and leave you there, this strain offers a powerful head high that may overwhelm new consumers so make sure you take it easy!

4. Blackberry Auto

Grew blackberry in my past 3 runs, love the Fruity berry smell and taste. Everything I grew it always comes out purple buds.

Simply called Blackberry, Fast Buds Autoflower Blackberry Kush, grows large purple buds so dark they almost appear black. Its hybrid effects offer a brief window of focus, followed by mellow relaxation. Blackberry typically reaches full maturity in eight weeks and is one of our most regular strains regarding grow times.

You can expect beautiful colors and even better aromas, this strain will surely leave your mouth watering due to the delicious sweet blackberry taste with a strong earthy background that comes hand-in-hand with a strong couch-lock effect, better recommended for nighttime use.

5. Fastberry Auto

We mentioned that our strains typically mature in 8 to 10 weeks, but Fastberry is anything but typical. It’s quite rare to encounter a plant from this seed that takes more than eight, and we’ve even seen a few talented growers chop this strain down in the seventh week. Fastberry is perfect for beginners who want to learn quickly, and experienced growers who want to push a strain to its limit. Its short height also makes it ideal for stealth or indoor cultivators.

Fastberry is Fast Buds’s autoflower take on the classic Cali medical strain, Blueberry. In addition to its ultra-fast grow time, Fastberry feels, tastes, and smells like its photoperiodic parent. If you want a classic, time-tested strain to put you to sleep at night, you won’t want to pass up growing Fastberry.

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6. In Conclusion

If you are looking for a quick grow cycle without affecting the quality and quantity of the harvest, look no more! These are the fastest strains that take no more than 9 weeks, allowing you to grow top-quality buds in less than 65 days!

If you’ve grown any of these strains before and have some tips and tricks, feel free to help fellow growers, leave a comment in the comment section below!

20 FASTEST Flowering Strains to Grow from Seed

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

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.

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

Buy Sour Crack Auto Feminized Seeds

+ 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.

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

Buy + Speed Auto Feminized Seeds

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.

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

Buy Fast Bud #2 Auto Feminized Seeds

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.

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

Buy Sweet Skunk Auto Feminized Seeds

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 a 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.

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

Buy Alaskan Purple Auto Feminized Seeds

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 only 8 weeks from seed. Its buds are packed with trichomes and have a very fruity scent. 14–19% THC.

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

Buy Crystal Candy XL Auto Feminized Seeds

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.

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

Buy Sweet Gelato Auto Feminized Seeds

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.

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

Buy Sweet Cheese XL Auto Feminized Seeds

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.

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

Buy Purple Punch Auto Feminized Seeds

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.

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

Buy Chocolate Skunk Auto Feminized Seeds

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

Buy Gigabud Feminized Seeds

Hash Plant

The famous Sensi Seeds Hash Plant indica originates from Afghani genetics bred in the Northwest United States that was 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

Buy Hash Plant Regular Seeds

Green Poison Fast

Green Poison Fast by Sweet Seeds is a top-quality weed strain that 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

Buy Green Poison Fast Version Feminized Seeds

Passion #1

Passion #1 is an outdoor indica strain from the seventies in California that 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

Buy Passion #1 Regular Seeds

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

Buy Tropicanna Poison F1 Fast Feminized Seeds

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

Buy Big Nugs Fast Feminized Seeds

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 quickly. Its Thai genetics present help C99 x Blueberry Fast grow big during flowering, so expect some stretching. High yields of thick, potent marijuana buds.

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

Buy C99 x Blueberry Fast Feminized Seeds

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

Buy Gorilla Girl F1 Fast Feminized Seeds

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

Buy Pineapple Express #2 Feminized Seeds

Pakistan Valley

Originating from the Hindu Kush mountains, Pakistan Valley by WOS is a landrace pure indica cannabis strain that grows quickly, finishing its flowering phase in just 45 to 55 days. It is 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

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13 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

Gorilla Girl F1 Fast is my favorite. Not sure if anyone likes it too.

Fast Bud #2 Auto seems one of the exciting options. But I haven’t tried it. Can anyone share how exactly would it be?

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