20 FASTEST Flowering Strains to Grow from Seed

20 FASTEST Flowering Strains from Seed to Weed Harvest top
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

Sour Crack Auto strain, seeds by Mmphisto Genetics

THE FASTEST autoflowering strain that Mephisto Genetics has ever grown, Sour Crack Auto finishes up at 7 weeks from seed (germination). Sour Crack Auto is made from Green Crack Auto and 24 Carat genetics. The short plants stay 20-28 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 Time7 weeks from seed
Strain BreederMephisto Genetics
Pack Size1/3/7/18 seeds
YieldIndoors: 30-60 g/plant
Outdoors: 60 g+/plant

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+ Speed Auto

+ Speed Auto fast flowering autoflower strain by Sweet Seeds

+ Speed Auto by Sweet Seeds are among the quickest finishing autoflower seeds to grow, being ready to harvest in only 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 to 20-35 inches in height, producing harvests up to 150 grams each. Tastes sweet, fruity and cheesy.

Grow Time7 weeks from seed
Strain BreederSweet Seeds
Pack Size3/5/10/25/100 seeds
YieldIndoors: 350-500 g/m2
Outdoors: 30-150 g/plant

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Green-O-Matic Auto

Green-O-Matic Auto fast autoflower strain by Greenhouse Seeds

Green-O-Matic Auto by Greenhouse Seed Co. is ready to harvest in just 55-60 days from germination. It’s a unique 80% indica, 10% sativa, 10% ruderalis hybrid strain developed from Moroccan, White Dwarf, Lowryder and ruderalis genetics. Green-O-Matic Auto plants are short in stature at only 12-16 inches tall while yielding as much as 800 g/m2 in optimized cultivation setups. Easy to grow, sweet smoke and decent potency. Over 15% THC content.

Grow Time55-60 days from seed
Strain BreederGreenhouse Seed Co.
Pack Size3/5/10 seeds
YieldIndoors: 800 g/m2
Outdoors: 30 g/plant

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Stardust Auto

Stardust Auto strain by Flash Seeds

Stardust Auto, named for its thick coating of sparkling white crystals, is a compact sativa dominant autoflower strain that’s fully mature at 55-65 days from seed. Only reaching 16-24 inches tall, these short plants grow uniform in a manner which lends itself to closely spaced Sea of Green methods. Made of 55% sativa, 30% indica, and 15% ruderalis genetics. Stardust Auto is an easy strain to grow indoors, outdoors or in greenhouses. The breeder Stitch says Stardust Auto is his favorite white strain for sleep. Skunky, berry flavors. 17% THC.

Grow Time55-65 days from seed
Strain BreederFlash Seeds
Pack Size3/8 seeds
Yield25-45 g/plant

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Alaskan Purple Auto

Alaskan Purple Auto quick-finishing autoflower by Seedsman

A 90% indica strain producing good yields, Alaskan Purple Auto by Seedsman finishes growing at 8 weeks from seed with some phenotypes ready to harvest at week 7. Alaskan Purple Auto is an easy growing, sizeable plant for an autoflowering strain that will mature one week later when grown outdoors. Ripe, fruity sweet flavors and 15-20% THC content.

Grow Time7-8 weeks from seed
Strain BreederSeedsman Seeds
Pack Size1/3/5/10/100 seeds
YieldIndoors: 400-550 g/m2
Outdoors: 40-200 g/plant

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Californian Snow Auto

Californian Snow Auto weed strain by FastBuds Seeds

Californian Snow Auto by FastBuds is a fast growing autoflower weed strain that’s ready to harvest at just over 60 days from start to finish. It was created by using American Old School Hot California genetics and a Canadian Ruderalis strain. Californian Snow Auto grows more sativa dominant, reaching 30-50 inches tall. Frosty, dense nuggets that reek of citrus. 19% THC.

Grow Time8 weeks from seed
Strain BreederFastBuds Seeds
Pack Size1/3/5/10/100 seeds
YieldIndoors: 400-550 g/m2
Outdoors: 50-250 g/plant

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Kush Van Stitch Auto

Kush Van Stitch Auto marijuana strain by Flash Seeds, Stitch

Fast, strong and distinctly indica, Kush Van Stitch Autoflowering seeds have a total grow time of only 60-65 days from seed to harvest. Kush Van Stitch Auto was created using OG Kush and Lowryder #2 genetics. The plants are stout indica strains, staying low to the ground at 20 inches indoors or 30 inches outdoors. Very kushy, hash flavored buds with 19% THC content.

Time60 days from seed
Strain BreederFlash Seeds
Pack Size3/8 seeds
YieldIndoors: 25 g/plant
Outdoors: 100 g/plant

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Chocolate Skunk Auto

Chocolate Skunk Auto strain quick finish by 00 Seeds

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. At over 40 inches tall, the plants grow large for an auto strain. Chocolate Skunk Auto produces beautiful compact, crystal-covered buds that smell great. 17% THC.

Grow Time60 days from seed
Strain Breeder00 Seeds
Pack Size3/5 seeds
YieldIndoors: 250-350 g/m2

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Chronic Ryder Auto

Chronic Ryder Autoflowering strain fast grow by Seedsman seeds

Chronic Ryder Auto is the result of crossing the well-known strain Chronic to a quick finishing autoflowering plant. Its developed by The Joint Doctor, responsible for releasing the first marketed autoflowering seeds – Original Lowryder. He has been working on autoflowering genetics longer than any other breeder and continues to release his seeds through one of the best seed banks, Seedsman. Chronic Ryder Auto represents a vigorous auto fem strain that brings in hearty yields of big fat buds.

Grow Time65 days from seed
Strain BreederSeedsman Seeds
Pack Size1/3/5/10/100 seeds

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Purple Mazar Auto

Purple Mazar fast autoflowering strain to grow by Flash Seeds

Purple Mazar is an fast flowering, mostly indica autoflower strain bred by Flash Seeds breeder Stitch. Purple Mazar contains the genetics of purple Mazar-I-Sharif crossed to ruderalis. The plants grow well in all environments, reaching 15-40 inches tall and finishing around 55-70 days from seed. Exotic, fruity buds with a high 19% THC content. Purple bud colors come out during low night temperatures.

Grow Time55-70 days from seed
Strain BreederFlash Seeds
Pack Size3/8 seeds
Yield30-80 g/plant

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Fastest Flowering Photoperiod Strains


Gigabud fastest flowering weed strain by G13 Labs

Gigabud is a Big Bud and Northern Lights hybrid that finishes flowering in a speedy 5-6 weeks. The 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 Time5-6 weeks
Strain BreederG13 Labs
Pack Size5 seeds
Yield450 g/m2+

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Hash Plant

Hash Plant strain super quick grow by Sensi Seeds

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 short 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 Time40-45 days
Strain BreederSensi Seeds
Pack Size10 seeds
Yield400-500 g/m2

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Green Poison FAST Version

Green Poison fast version early flowering cannabis strain by Sweet Seeds

Green Poison FAST Version by Sweet Seeds is a top quality weed strain that forms super frosty, 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 help the plants produce its dank, heavy, fruity marijuana buds.

Flowering Time6 weeks
Strain BreederSweet Seeds
Pack Size3/5/10/25/100 seeds
YieldIndoors: 500-600 g/m2
Outdoors: 500-700 g/plant

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Passion #1

Passion #1 marijuana strain fast flowering by Dutch Passion

Passion #1 started as an outdoor indica strain from California in the 1970s, making its way over to Holland during the 1980s. It’s a stable, easy to grow regular seed strain. Passion #1 can get huge outdoors and indoors, finishing its flowering cycle in a mere 6 weeks of bloom time. The citrus-like buds are long, dense and full of resin. 18.6% THC content.

Flowering Time6 weeks
Strain BreederDutch Passion
Pack Size10 seeds
Yield250-750 g/plant

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Quick Critical+

Quick Critical+ strain by Dinafem cannabis seeds

The latest fast flowering strain from Dinafem, Quick Critical + is a 75% indica, 25% sativa cross with a super quick flowering time. Thanks to a reversed female clone of Critical+ 2.0 Auto crossed to a photoperiod Critical + clone, this new photoperiod hybrid finishes 7-14 days quicker than the original Critical +. Easy to grow, high yielding, skunky lemon weed. THC content is 16-20%.

Flowering Time42-49 days
Strain BreederDinafem Seeds
Pack Size1/3/5/10 seeds
YieldIndoors: 600 g/m2
Outdoors: 1250 g/plant

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Big Nugs Fast

Big Nugs Fast weed strain by Seedsman

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

Flowering Time6-7 weeks
Strain BreederSeedsman Seeds
Pack Size1/3/5/10/100 seeds
Yield450-550 g/m2

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White Critical Express

White Critical Express fast flowering strain by Kalashnikov Seeds

White Critical Express is a cross of White Widow x Critical Mass with Kalashnikov Seeds’ secret hybrid. It’s a very fast flowering strain that’s ready to harvest in max. 49 days flower. White Critical Express is easy to grow, the plants respond well to training methods for increased yields. White Critical Express produces highly potent, widowy buds at over 21% THC.

Flowering Time42-49 days
Strain BreederKalashnikov Seeds
Pack Size3/5/10 seeds
Yield500 g/m2

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Pineapple Express #2

Pineapple Express #2 fast weed strain by G13 Labs

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 features high resistance to mold and moisture. The buds are large, fruity and full of trichomes. Pineapple Express #2 can grow huge outdoors.

Flowering Time45-50 days
Strain BreederG13 Labs
Pack Size5 seeds
YieldIndoors: 700 g/m2
Outdoors: 900-1300 g/m2

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C99 x Blueberry Fast

C99 x Blueberry Fast flowering marijuana strain by Seedsman seeds

C99 x Blueberry Fast is a quick flowering mostly sativa 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. The Thai genetics present help C99 x Blueberry Fast grow big during flowering, so expect some stretching. High yields of thick, potent marijuana buds.

Flowering Time6-7 weeks
Strain BreederSeedsman Seeds
Pack Size1/3/5/10/100 seeds
Yield350-450 g/m2

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Pakistan Valley

Pakistan Valley fast landrace strain by World of Seeds

Originating from the Hindu Kush mountains, Pakistan Valley by WOS is a landrace pure indica cannabis strain that grows quick, finishing it’s flowering phase in just 45-55 days. A vigorous grower, especially suited towards dry climates where the buds can bulk up dense and resinous. Thick, compact, super sticky and potent, the THC content can exceed 20%. Available in both regular and feminized seeds.

Flowering Time45-55 days
Strain BreederWorld of Seeds
Pack Size10 seeds
YieldIndoors: 400 g/m2
Outdoors: 700 g/m2

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

  1. 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.


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