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 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 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

+ Speed Auto

+ 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 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

Green-O-Matic Auto

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 Time	55-60 days from seed
Strain Breeder	Greenhouse Seed Co.
Pack Size	3/5/10 seeds
Yield	Indoors: 800 g/m2 Outdoors: 30 g/plant

Stardust Auto

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 Time	55-65 days from seed
Strain Breeder	Flash Seeds
Pack Size	3/8 seeds
Yield	25-45 g/plant

Alaskan Purple Auto

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

Californian Snow Auto

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 Time	8 weeks from seed
Strain Breeder	FastBuds Seeds
Pack Size	1/3/5/10/100 seeds
Yield	Indoors: 400-550 g/m2 Outdoors: 50-250 g/plant

Kush Van Stitch Auto

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.

Time	60 days from seed
Strain Breeder	Flash Seeds
Pack Size	3/8 seeds
Yield	Indoors: 25 g/plant Outdoors: 100 g/plant

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

Chronic Ryder Auto

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 Time	65 days from seed
Strain Breeder	Seedsman Seeds
Pack Size	1/3/5/10/100 seeds
Yield	High

Purple Mazar Auto

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 Time	55-70 days from seed
Strain Breeder	Flash Seeds
Pack Size	3/8 seeds
Yield	30-80 g/plant

Fastest Flowering Photoperiod Strains

Gigabud

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

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

Green Poison FAST Version

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 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

Passion #1

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

Quick Critical+

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 Time	42-49 days
Strain Breeder	Dinafem Seeds
Pack Size	1/3/5/10 seeds
Yield	Indoors: 600 g/m2 Outdoors: 1250 g/plant

Big Nugs Fast

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

White Critical Express

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 Time	42-49 days
Strain Breeder	Kalashnikov Seeds
Pack Size	3/5/10 seeds
Yield	500 g/m2

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

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

C99 x Blueberry Fast

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

Pakistan Valley

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

 

READ NEXT: 21 Cheap Weed Seeds $6 and Under

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