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
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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