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Takeaway: Outdoor growing can be unpredictable, making fast-flowering a must.

The Best Fast-Flowering Cannabis Seeds for Outdoor Growers

Takeaway: Outdoor growing can be unpredictable, making fast-flowering a must.

With too many varieties to choose from out there, it can be difficult to sift through all of the options for a fast flowering cannabis seed for your outdoor grow. Fortunately, there are plenty of fast-flowering seeds out there to help outdoor growers hedge against the uncertainty of outdoor conditions. These genetically programmed beauties are the quickest strains available and can finish flowering in as little as seven to eight weeks. But don’t worry: faster flowering speeds don’t have to mean a lower quality grow. These strains still have high potency, quality and yield; you will just realize these benefits faster! Fast seeds are the answer for growers in northern climates and shorter growing seasons, or for anyone that just wants to get to the finish line a bit faster than their competition.

Northern Lights #5 Fast

This quick-growing version of its namesake flowers a few weeks sooner than the original Northern Lights #5 (NL5). This strain originates from Afghan Indica genetics and as such is a smaller plant that produces highly resinous flowers. It is the perfect choice for those living in areas with early frost dates.

AK-47 Fast

Like the Northern Lights #5, the AK-47 Fast is a strain of the species that has a short grow time of seven weeks to the onset of inflorescence. This strain produces dense, Indica-like buds with high yields, and sweet, earthy tastes.

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Fastest weed seeds to grow
Buy Passion #1 Regular Seeds?

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.

Table of Contents:

Fastest Flowering Autoflower Strains

Sour Crack Auto

Overview: THE FASTEST autoflowering strain that Mephisto Genetics has ever grown, Sour Crack finishes up at 7 weeks from seed (germination). Sour Crack is made from Auto Green Crack and 24 Carat genetics. The short plants (50-70cm) grow rock hard resinous buds quick, with a high potency tested near 20% THC. Great for commercial quality Sea of Green autoflower grows.

Grow Time 7 Weeks from Seed
Strain Breeder Mephisto Genetics
Seed Sex Feminized
Yield Indoors: 30-60g/plant; Outdoors: 60g+/plant

Buy Sour Crack Auto Feminized Seeds?

+ Speed Auto

Overview: + Speed Auto by Sweet Seeds is one of the quickest finishing autoflower strains to grow, being ready to harvest in only 7 weeks from seed. Speed+ is comprised of the breeder’s own Critical Mass and the Speed Devil #2 Auto genetics, bred for yield and deep aromatic properties. Grows well both indoors and outdoors, the plants grow to about 50-90cm in height producing up to 150 grams per plant. Tastes sweet, fruity, cheesy.

Grow Time 7 Weeks from Seed
Strain Breeder Sweet Seeds
Seed Sex Feminized
Yield Indoors: 350-500 g/m2; Outdoors: 30-150g/plant

Buy + Speed Auto Feminized Seeds?

Green-O-Matic Auto

Overview: In just 55-60 days from germination, Green-O-Matic Auto by Greenhouse Seed Co. is ready to harvest. Green-O-Matic Auto is an 80% indica 10% sativa 10% ruderalis hybrid autoflowering strain developed from Moroccan, White Dwarf, Lowryder and further ruderalis genetics. Green-O-Matic Auto plants are short in stature at only 30-40cm tall, but can yield as much as 800 g/m2 in an optimized SoG setup. Easy to grow, sweet smoke and decent, over 15% THC content.

Grow Time 55-60 Days from Seed
Strain Breeder Greenhouse Seed Co.
Seed Sex Feminized
Yield Indoors: 800 g/m2; Outdoors: 30 g/plant

Buy Green-O-Matic Auto Feminized Seeds?

Stardust Auto

Overview: Stardust Auto, named for the thick coating of sparkling white crystals, is a compact sativa-dominant autoflowering strain that finishes fully mature in 55-65 days from seed. The short plants grow 40-60cm tall, made of 55% sativa 30% indica and 15% ruderalis genetics, easy to grow indoors, outdoors or greenhouse. The breeder Stitch says Stardust is his favorite white strain for sleep. Skunky, berry flavors. THC 17%.

Grow Time 55-65 Days from Seed
Strain Breeder Flash Seeds
Seed Sex Reg / Fem
Yield 25-45g/plant

Buy Stardust Auto Reg / Fem Seeds?

Alaskan Purple Auto

Overview: A 90% indica strain producing nice yields, Alaskan Purple Auto by Seedsman finishes in 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 and will finish one week later when grown outdoors. Ripe, fruity sweet flavors and 15-20% THC content.

Grow Time 8 Weeks from Seed
Strain Breeder Seedsman Seeds
Seed Sex Feminized
Yield Indoors: 400-550g/m2; Outdoors: 40-200g/plant

Buy Alaskan Purple Auto Feminized Seeds?

Californian Snow Auto

Overview: A sativa-indica cross of American Old School Hot California strain and a Canadian Ruderalis plant, Californian Snow Auto by FastBuds Seeds is a fast grower being ready to harvest in just over 60 days from start-to-finish. The plant grows more sativa-dominant, reaching 80-130cm tall. Californian Snow Auto buds form into frosty dense nuggets that reek of citrus. 19% THC.

Grow Time 8 Weeks from Seed
Strain Breeder FastBuds Seeds
Seed Sex Feminized
Yield Indoors: 400-550g/m2; Outdoors: 50-250 g/plant

Buy Californian Snow Auto Feminized Seeds?

Kush Van Stitch Auto

Overview: Fast, strong and distinctly indica, Kush Van Stitch Autoflowering was created using OG Kush and Lowryder #2 genetics. Kush Van Stitch are stout, vigorous plants growing near 50cm indoors and 80cm outdoors. Total grow time from seed to harvest is a quick 60-65 days. Very kushy, hash flavored buds with 19% THC content.

Time 60 Days from Seed
Strain Breeder Flash Seeds
Seed Sex Reg / Fem
Yield Indoors: 25g/plant; Outdoors: 100g/plant

Buy Kush Van Stitch Reg / Fem Seeds?

Chocolate Skunk Auto

Overview: 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 at over 100cm tall and produce beautiful compact, crystal covered buds that smell great. 17% THC.

Grow Time 60 Days from Seed
Strain Breeder 00 Seeds
Seed Sex Feminized
Yield Indoors: 250-350 g/m2

Buy Chocolate Skunk Auto Feminized Seeds?

Chronic Ryder Auto

Overview: The well-known strain Chronic has been bred into a quick autoflowering plant, Chronic Ryder Auto by Seedsman. A vigorous auto strain that produces hearty yields of big fat buds, Chronic Ryder Auto was developed by The Joint Doctor, who is responsible for releasing the 1st marketed autoflowering seeds, Original Lowryder. He has been working on autoflowering genetics longer than any other breeder and continues to release his seeds through Seedsman.

Grow Time 65 Days from Seed
Strain Breeder Seedsman
Seed Sex Feminized
Yield High

Buy Chronic Ryder Auto Feminized Seeds?

Purple Mazar Auto

Overview: Purple Mazar is an fast flowering mostly indica autoflowering strain bred by Flash Seeds breeder Stitch. Puple Mazar contains the genetics of a purple Mazar-I-Sharif crossed with ruderalis. The plants grow in all environments 40-100cm tall 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 Time 55-70 Days from Seed
Strain Breeder Flash seeds
Seed Sex Reg / Fem
Yield 30-80 g/plant

Buy Purple Mazar Auto Reg / Fem Seeds?

Fastest Flowering Photoperiod Strains


Overview: Gigabud is a Big Bud and Northern Lights hybrid that finishes flowering in a speedy 5-6 weeks. A thirsty, vigorous strain in veg and flower, Gigabud is a medium-sized plant with indica genetics. Massive production of resinous, fruity buds. There is also an autoflowering Gigabud strain for sale.

Flowering Time 5-6 Weeks
Strain Breeder G13 Labs
Seed Sex Feminized
Yield 450 g/m2+

Buy Gigabud Feminized Seeds?

Hash Plant

Overview: The famous Sensi Seeds Hash Plant indica comes from Afghani genetics bred in the northwest United States and then brought to Sensi Seeds in Holland where it was crossed with Northern Lights, another Afghan variety. Ready to harvest in as short as 40 days from flowering, Hash Plant seeds grow quick, in their stout, thick appearence. The buds are super dense, very sticky and hashy. A good choice for breeders.

Flowering Time 40-45 Days
Strain Breeder Sensi Seeds
Seed Sex Regular
Yield 400-500 g/m2

Buy Hash Plant Regular Seeds?

Green Poison FAST Version

Overview: A top quality weed strain that gets super frosty and tight, Green Poison FAST Version by Sweet Seeds 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 form up very dank heavy, fruity buds.

Flowering Time 6 Weeks
Strain Breeder Sweet Seeds
Seed Sex Feminized
Yield Indoors: 500-600 g/m2; Outdoors: 500-700 g/plant

Buy Green Poison FAST Version Feminized Seeds?

Passion #1

Overview: Passion #1 started as an outdoor indica strain from California in the 1970s, and made it over to Holland in the 1980s. A stable regular seed strain that is easy to grow. Passion #1 can get huge outdoors and indoors finishes the flowering cycle in a mere 6 weeks time. The citrus-like buds are long, dense and full of resin. 18.6% THC content.

Flowering Time 6 Weeks
Strain Breeder Dutch Passion
Seed Sex Regular
Yield 250-750 g/plant

Buy Passion #1 Regular Seeds?

Quick Critical+

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

Flowering Time 42-49 Days
Strain Breeder Dinafem Seeds
Seed Sex Feminized
Yield Indoors: 600 g/m2; Outdoors: 1250 g/plant

Buy Quick Critical+ Feminized Seeds?

Big Nugs Fast

Overview: 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. Bred from Big Bud / Critical Mass (Afghani x Skunk) crossed with Seedsman’s fast finishing male plants pollen. 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 tones.

Flowering Time 6-7 Weeks
Strain Breeder Seedsman Seeds
Seed Sex Feminized
Yield 450-550 g/m2

Buy Big Nugs Fast Feminized Seeds?

White Critical Express

Overview: A very fast flowering strain ready in max 49 days flower, White Critical Express is a cross of White Widow x Critical Mass with Kalashnikov Seeds’ secret hybrid. Easy to grow and train the buds to milk a high yield. White Critical Express produces highly potent widowy buds over 21% THC.

Flowering Time 42-49 Days
Strain Breeder Kalashnikov Seeds
Seed Sex Feminized
Yield 500 g/m2

Buy White Critical Express Feminized Seeds?

Pineapple Express #2

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

Flowering Time 45-50 Days
Strain Breeder G13 Labs
Seed Sex Feminized
Yield Indoors: 700g/m2; Outdoors: 900-1300g/m2

Buy Pineapple Express #2 Feminized Seeds?

C99 x Blueberry Fast

Overview: A quick flowering sativa-dominant hybrid cannabis strain, ready to harvest in just 45 days from start of flowering cycle. The infamous C99 strain is crossed with Blueberry and then bred with Seedsman’s fast parent to make C99 x Blueberry Fast, a sativa-dominant quick-finishing strain. The Thai genetics present make this strain get big during flowering, so expect a little stretch. Yields of thick, high-THC buds are high.

Flowering Time 6-7 Weeks
Strain Breeder Seedsman Seeds
Seed Sex Feminized
Yield 350-450 g/m2

Buy C99 x Blueberry Fast Feminized Seeds?

Pakistan Valley

Overview: Originating from the Hindu Kush mountains, Pakistan Valley 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 the THC content can exceed 20%. Available in both regular and feminized seeds.

Flowering Time 45-55 Days
Strain Breeder World of Seeds
Seed Sex Reg / Fem
Yield Indoors: 400g/m2; Outdoors: 700g/m2

Buy Pakistan Valley Reg / Fem Seeds?

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1 thought on “20 FASTEST Flowering Strains to Grow from Seed”

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