fast growing marijuana seeds

Top 6 Fastest-Growing Cannabis Seeds

Check out these 6 strains if you’re looking for speed. This mixture of autoflowering and feminized photoperiod strains will race through veg and bloom to deliver a yield with immense flavours and potent effects.

Cannabis strains have been selectively bred over the years to produce specific, desirable traits. Some breeders aim for sheer potency and try to promote max THC levels. Others focus on the therapeutic effects of the herb, attempting to increase CBD and terpene concentrations. However, there is one demand that will always exist among all cannabis growers: speed.

Speed is an important aspect to many different kinds of growing operations. Commercial growers value this trait because of the fast turnover. Discreet growers and guerrilla growers develop a taste for speed as it allows them to begin and end their operation as fast as possible. Below are 6 of the fastest-growing cannabis seeds.



Vanilla Ice Autoflowering was crafted using the original Vanilla Ice along with a ruderalis strain. Ruderalis genetics are primarily included for their autoflowering traits, with speed of growth being a massive bonus in many strains. Here too, ruderalis delivers the goods, whereas Vanilla Ice transferred her fresh, sugary, and vanilla flavours and indica-dominant genetics. Her THC level of 13% provides a soft and gentle high that is easily manageable, even after several joints and bong hits. She’s perfect for complete novices and those who don’t get along too well with sky-high THC levels.

Vanilla Ice Autoflowering produces impressive harvests of tall and narrow buds within a short time frame. Both indoor and outdoor crops will be ready to harvest a mere 55–65 days after germination. Indoor plants grow to around 60–90cm, making them easy to conceal, and produce a harvest of up to 350g/m². Plants grown outside will remain stealthy among the undergrowth at heights of 50–100cm, yielding 100–175g/plant.


As her name suggests, Candy Caramelo is known for more than just her brief grow cycle. The trichomes of this strain truly work overtime pumping out terpenes that merge to create mouthwatering flavours of mint, caramel, and sugar. Utilising simple extraction methods such as cannabutter allows users to craft sweet edible delights that are irresistible. Smoking this flower brings on a stoning indica high that soothes the body and induces a chill state for a couple of hours.

The flowers of Candy Caramelo are small, compact, and tapered. But don’t judge them by their size. Each toke is infused with unparalleled flavour and a THC level that hovers around 15%. Expect a yield of 300–350g/m² and a height of 75cm when growing this strain indoors. Alternatively, outdoor plants will pump out 220g/plant and max out at a height of 120cm. Growers don’t wait long to taste these flavours; she’ll be ready to trim as little as 50 days after germination.


Northern Lights XL Autoflowering ticks almost all of the boxes that autoflowering growers are looking for. She offers a good yield, fast flowering time, decent potency, and brilliant aesthetics. To make this possible, the legendary Northern Lights XL was bred with a ruderalis strain, a move that saw highly prolific and legendary genetics shift over into the auto realm. This lady offers a chill and mellow indica high fuelled by a 14% THC level and tastes and aromas of sweetness and citrus.

This speedy specimen pumps out gorgeous flowers that are narrow, tall, and feature shades of green, grey, light purple, and white. When grown indoors, she’ll ascend to a height of around 120cm and yield up to 400g/m². Outdoors, she’ll grow to a taller height of 150cm and deliver up to 230g/plant.



White Cheese was forged in the grow room using the reliable and productive genetics of Afghan and Skunk. This merging created a fast-flowering delicacy with a rich taste of spice and cheese, and a physical indica high that’s ideal for experiencing in the late evening thanks to its sedating qualities at high doses. A THC level of 17% places her on the more mellow end of the spectrum; it’s enough to induce relaxation without catapulting the smoker into a hazy state of paranoia and overwhelm.

White Cheese will be ready to dry and cure within a brief flowering time of 50 days, reaching a manageable height of up to 90cm and yielding 350–450g/m² indoors. Outdoor plants put out satisfying yields of 150–220g/plant and achieve a maximum height of 120cm.


The highly efficient and extremely productive genetics behind this strain are derived from South Africa. Power Plant XL is known for her massive yield that is conveniently paired with fast-paced growth. Growers will watch the plant flower for around 55 days until they can begin drying, curing, and sampling the fruits of their labour. What’s more, this sativa-dominant lady produces a THC level of approximately 20%. The terpene profile within the flowers augments this experience with flavours of sweet, sour, and pine.

Power Plant XL doesn’t mess around; it’s almost like she wants to be smoked as quickly as possible. These flowers appear on indoor plants in quantities of 600–750g/m², with specimens reaching just over a metre in height. Plants grown outdoors in Mother Nature’s embrace will provide a mammoth yield of up to 600g/plant and peak at a height of around 200cm.


Lemon Kush offers an incredibly tangy citrus hit delivered alongside a THC level of 18%. This zesty and refreshing profile complements the indica high well by adding an edge of stimulation and alertness. This interesting combination came about as breeders matched parent Strains Chemdawg, Lemon Thai, and Pakistani Kush. These desirable traits are available to growers after a short flowering time of approximately 55 days.

Lemon Kush isn’t fussy, growing with ease in both indoor and outdoor environments. Indoor plants grow to a height of between 100–130cm and easily yield up to 500g/m². In comparison, outdoor plants top out at 230cm and yield between 450–550g/plant.

Speed is an important factor in cannabis cultivation, and these 6 seeds fit the bill perfectly whether you're a novice or an experienced hand.

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 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

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+ 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

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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

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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

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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

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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

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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

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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

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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

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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

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Fastest Flowering Photoperiod Strains


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+

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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

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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

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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

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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

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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

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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

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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

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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

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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

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