Fast Growing Marijuana Seeds


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Bred specifically for their speed, these are the ten fastest growing cannabis strains available right now, check it out! If you're looking for fast growing seeds, has a wide selection of auto flowering, feminized or regular fast growing seeds at low prices with discrete delivery. These fast-flowering cannabis strains are perfect for novice growers as well as set-it-and-forget-it growers who want to squeeze out a harvest with little time to spare.

10 Fastest Growing Cannabis Strains

Seedsman aims to make growing the best cannabis easier, but we can help make it faster, too. Whether you’re late planting your seeds, looking for multiple harvests, or just downright impatient, the easiest way to speed up the whole process is in your choice of cannabis seeds – in other words, by selecting a fast-growing cannabis strain from the outset.

It doesn’t matter if you grow indoors or outdoors, either – if you need results in a hurry, these speedy strains will do the job.

Most of the plants below are hybrids of vigorous photoperiod strain cannabis plants paired with the insanely-quick flowering times of autoflowering strains. Flowering times are somewhat approximate but largely accurate.

Seedsman has a series of fast-growing strains, genetically bred for their turnaround. We’ll have a look at a few of these before examining some classic speedy strains

White Widow FAST

Seedsman’s own White Widow FAST seeds combine the photoperiod genes of the legendary White Widow Strain with Fast genetics. The result is a sturdy plant with a flowering time of between just six and seven weeks, meaning all the most sought-after qualities of the classic 1990s strain can be yours a week sooner than they would with the regular photoperiod version.

White Widow FAST is a fairly short indica/sativa hybrid, growing to no more than 120cm. This, coupled with its lightning-quick flowering period make it an ideal strain for growers looking to produce with some degree of stealth. She’ll deliver respectable yields, too – look forward to 350-450 gr/m2 of frosty-looking buds, packing a THC content around the 20% mark. This translates to a powerful effect that begins in the head before moving south to relax the body.

White Widow FAST is just as productive and easy to grow indoors, outdoors, or in greenhouses.

Jack Herer FAST

Another classic strain available with a quick finish, Jack Herer FAST somehow manages to improve on the original by shaving up to a fortnight off the flowering time. That’s right – award-winning cannabis can be yours in just seven weeks! Like White Widow FAST, Jack Herer FAST’s growth will peak at no more than 120cm, yielding around 400 gr/m2 of high-THC buds that positively drip with sugary trichomes.

This is a strain well-suited to indoor growing, but outdoor cultivation will produce equally great results, and plants are ready to harvest before the wetter weather comes in around September.

Jack Herer FAST retains all the desirable qualities of the famed original – expect the unmistakable sweet and peppery Jack taste along with those familiar herbal and pine aromas. It’s a slightly sativa-leaning hybrid with a high-THC content, meaning Jack Herer FAST wraps you in a blissful, euphoric and creative blanket.

C99 x Blueberry FAST

Fans of Cinderella 99 and Blueberry will love the hybrid offspring of these favourites, and the fast-flowering version means you won’t have to wait any more than 7 weeks to get your hands on this fruity beauty.

C99 x Blueberry FAST grows quick, but it also takes a stretch, so be sure to allow adequate room to accommodate the significant growth this indica/sativa hybrid needs when she starts to flower. Equally happy growing indoors or outdoors, this strain produces as much as 450 gr/m2 of high-quality bud, generously coated in trichomes. Cultivators will love to hear that C99 x Blueberry FAST has relatively few larger leaves, and as such, trimming is easy.

If you like to indulge your palate with fruity flavours, this strain will delight with its combination of blueberry and citrus tastes. Expect more than a hint of South East Asia from its Thai Sativa genetics, and a high THC content of around 20% is yours after just 45 days. C99 x Blueberry FAST will vanish stress and melt your cares away with its dreamy cerebral effects, and in no time at all, you’ll be floating on a wave of euphoria.

Amnesia FAST

For fans of harder-hitting hybrids, Seedsman’s Amnesia FAST has all the qualities you’re looking for in a quick-growing strain. High THC and high yields make for high times with this impressive plant. Ready after 50-55 days of flowering, Amnesia FAST should be on anyone’s shopping list.

Amnesia FAST combines the genetics original Amnesia strain with a top-secret hybrid, and the results are impressive. It’s a medium-sized plant, coming in at 100-150cm, but that plant produces extremely respectable yields of 550-600 gr/m2 when grown indoors. Buds are dense, and generously packed with an eye-popping 25% THC! She’s just as happy growing outdoors, but leave plenty of space when planting to accommodate the additional growth.

Aroma and taste share some similarities with the original Amnesia strain, but with added fruity and floral notes over and above the spicy haze of its ancestor. The strong cerebral, creative effect from the mostly-sativa genetics, coupled with the outstanding THC content means Amnesia FAST is one you definitely won’t forget!

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Black Sugar

For a fast-flowering strain with high yields, high THC and medicinal properties, look no further than Seedsman’s own Black Sugar. In just 8 weeks, this truly unique strain offers up some of the finest traits its parentage has to offer. From Black Domina, we’ve retained the great yield and flowering rate, while keeping the medical properties from L.A. OG and the compact size of the Critical Strain.

Black Sugar is a powerful mostly-indica strain, with a shorter structure that makes it idea for those looking to grow plants quickly with limited space. The yields are among the most impressive around, with 600 gr/m2 common among indoor growers and a superb 800 gr/plant achievable if cultivating outdoors. Buds are generous, and have a sugar-dipped appearance to them

This is a very high-THC strain that offers upwards of 20%, resulting in a powerful, sedative body effect when coupled with the indica properties. For this reason, Black Sugar is an excellent choice as an evening strain to chase away insomnia. A winner with fans of fruity flavours, Black Sugar boasts a taste profile packed full of fruity lemon and orange with a hint of Skunk.

Gorilla Sherbet F1 FAST

Spanish powerhouse Sweet Seeds seed bank brings the heat with Gorilla Sherbet F1 FAST, a high-THC strain bred from Sunset Sherbet and Gorilla Girl XL Auto. The result is a 70% indica strain that can blow your hair back thanks to its THC content, which tops out at around 23%.

This speedy grower is ready in just 49 days and offers up sizeable yields of between 400-550 gr/m2 when cultivated indoors, whereas outdoor growers can look forward to more sizeable plants, and yields between 350-600 gr/plant.

Along with the generous THC levels, expect a mind-bending taste profile that includes sweet citrus, wood, and a hint of cool menthol before being swept away by the happy, relaxing stimulating effect.

Speedy Chile FAST Version

A rapid-flowering, indica-dominant hybrid, Royal Queen Seeds’ Speedy Chile FAST Version combines Green Poison and Chile Indica to stellar effect. This is an easy-growing strain that requires no specific special attention, and the result is an impressive and above-average yield just 8 weeks after germination – that’s two weeks of vegetative, then six weeks of flowering time!

Whether you grow Speedy Chile indoors, outdoors, or under the cover of a greenhouse, you can rest assured you’ll see handsome rewards in a timescale you never would imagine. Yields as high as 500 gr/plant are possible for outdoor cultivators, and indoor growers can look forward to almost the same! It should be noted that Speedy Chile is best grown indoors unless you live in a warmer, Meditteranean-type environment.

Expect a respectable potency from Speedy Chile – THC content is a handsome 16% with very little CBD, resulting in a mellow but uplifting head effect, with some medicinal benefits for insomnia, pain and lack of appetite.

Autoflowering Varieties

2 Fast 2 Vast Auto

If you’re looking for the added ease of Autoflowering properties along with fast flowering times, this one’s worth your attention. Heavyweight Seeds challenged themselves to improve upon their own Fast and Vast strain and did so by adding a Northern Lights Auto to a gene pool comprising White Dwarf and Auto Skunk. The result is a robust plant that gives up its many treasures in just 8 weeks of flowering.

This strain is comfortable growing in any environment and while THC is high at around 20%, makers of extracts and concentrates are sure to be thrilled by the prolific amounts of resin 2 Fast 2 Vast produces – its appearance is positively glistening with crystals. Better yet is the yield – indoor growers can look forward to between 600-800 gr/m2 from this amazingly productive plant.

This is a heavyweight strain from Heavyweight seeds – flavours are fruity to the maximum and a smooth smoke is assured, along with a fantastic, giggly effect that morphs into a long-lasting and relaxed body stone.

Speed Bud Auto

If you’re looking to grow cannabis in record time, you’ll be hard pushed to top Speed Bud Auto for sheer quickness. With a lightning-fast flowering time of just 5 weeks, this small but efficient strain from Female Seeds has few peers when comes to fast-growing cannabis strains.

Touting a diminutive stature of just 80cm, Speed Bud Auto makes a great choice if you’re growing marijuana in a discreet outdoor setting, but is just as comfortable in an indoor environment. Yields are smaller, as you’d imagine, but if sheer flowering speed is what you’re looking for, look no further. As a bonus, this strain is less leafy, meaning manicuring the plant is as quick and easy as growing it!

Speed Bud Auto is a fairly resinous plant but is said to be of lower potency, so if a nice, mellow relaxing effect is your thing, this strain is likely to hit the spot. Enjoy the smooth Diesel taste of this one as you read your speeding ticket!

Star CBD Auto

We wrap up our list of fast-growing cannabis strains with one for the CBD lovers – the Ministry of Cannabis’ Star CBD Auto. Thanks to a rapid flowering time of just six weeks, you can enjoy a strain high in cannabidiol sooner than you may have thought.

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Star CBD Auto is a mostly-indica plant, but with a high CBD ratio of about 10% and a low THC ratio to match. The result is a superbly-balanced cannabis strain that offers great therapeutic potential in addition to its recreational capabilities.

This is a compact plant, but its autoflowering nature and Ruderalis genetics make it robust. An indoor grow can yield up to 120 gr/plant, but outdoor cultivation can see output almost double with some growers reporting yields of 230 gr/plant. Star CBSD Auto’s flavour is described as a blend of incense and musk, with a blissful calming body sensation to soothe aches, pains and stress.

*Please note, in the US we’re running low on the non-Seedsman stock listed above. If the strain you’re looking for is not in stock, don’t stress, we’re currently undertaking a massive stock replenishment in our US warehouse. *

Cultivation information, and media is given for those of our clients who live in countries where cannabis cultivation is decriminalised or legal, or to those that operate within a licensed model. We encourage all readers to be aware of their local laws and to ensure they do not break them.

Fast Growing Cannabis Strains

Many marijuana strains take 10 weeks or more from planting to harvest time, which is fine if you have plenty of patience, but less good if you’re in a hurry to get your hands on a potent crop of weed. In fact, some strains, especially Sativa dominant types, can take up to 14 weeks or more before they’re ready for harvest, which might try the patience of a saint.

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Fast Growing Marijuana Seeds

If your principal criterion is speed of growth, then you should probably avoid the Sativa type strains altogether and opt for the Indica types, which mature more quickly. To get to harvest quickest, you’re best advised to grow indoors with the best lighting setup you can afford, using a hydroponic growing medium. The hydroponic method gives you the most precise control of nutrient additives, which can be used to speed up the growth of your plants.

You can also use lighting phases to accelerate growth but exercise caution. If you push your plants too hard, you could end up with straggling monsters of low potency. Once you’ve got your growing regime right, the most important factor in getting a crop to maturity quickly is your choice of strain.

Look out for strains that can mature in from six to eight weeks, with six weeks being about the quickest time you can realistically achieve a good harvest. Some strains to consider include Northern Lights s, a strain much favoured by commercial growers which can flower in as little as seven weeks, The Cheeseh , an Amsterdam coffee shop favourite that can be ready in between six and eight weeks, and Pineapple Kush , another strain that can be ready in eight weeks with the right growing conditions.

10 Fast-Growing Cannabis Flowers for Impatient Gardeners

Growing cannabis can be an arduous process. Beyond the space, materials, and nutrients needed, time and light are the most essential ingredients in the cannabis cultivation equation. But what if you’re impatient or short on time? Is there a way to speed up the growing process?

Historically, black market growers would seek out or hybridize strains to harness attributes that catered to their surreptitious needs. These plants would usually be short and stalky with larger-than-average yields, and in some instances they would be autoflowering (such as a ruderalis hybrid). They were designed to be fast-flowering for both a quick turnover and so they could be easily relocated from time to time.

The fast-flowering cannabis strains listed below are now emerging for professional and hobby growers to utilize. They’re perfect for novice growers as well as set-it-and-forget-it growers who want to squeeze out a harvest with little time to spare. The list includes a mixture of both photoperiod and autoflowering varieties so you can find the perfect plants for your setup.

Photoperiod Strains That Grow Quickly (7-9 Weeks)


Lowryder is a hybrid strain that was inbred for nine generations by Joint Doctor Seeds to give it a dwarfed size. Growing no more than 16 inches tall, it’s the cannabis equivalent of a bonsai for the discrete grower’s windowsill or balcony. Lowryder’s small size comes from a species of cannabis ruderalis crossed with Northern Lights #2 and then William’s Wonder. Consumers, be patient with this strain: its medicinal and cerebrally stimulating effects have a slow but powerful onset. A mild earthy aroma radiates from the small, conic buds which autoflower in a short 40 to 45 days. Lowryder is a stalwart plant that can survive in harsh, colder climates, making it a popular strain in northern regions like Finland and Canada.

Critical Kush

Critical Kush from Barney’s Farm is a mostly indica strain that blends together two famed cannabis staples, Critical Mass and OG Kush. Aromatic notes of earthiness and spice usher in a calming sensation that relaxes the mind and body. Critical Kush pairs a staggeringly high THC content with a moderate dose of CBD, making this strain a perfect nighttime medication for pain, stress, insomnia, and muscle spasms. Growers cultivating this strain indoors will wait 50 to 60 days for Critical Kush to complete its flowering cycle.

Early Girl

Early Girl is the wallflower of cannabis strains since its introduction in the 1980s. Lovingly preserved by the breeders at Sensi Seeds, this strain is lazy and relaxed, nothing over the top. A 75/25 indica-dominant hybrid, Early Girl is a good one for those new to cannabis who would like relief from stress. Also a great strain for novice growers, it’s compact, resilient, and has a particularly short flowering time of 7 to 8 weeks. Early Girl grows especially well outdoors, but won’t put up a fuss if she’s stuck inside.

OG Kush

OG Kush makes up the genetic backbone of West Coast cannabis varieties, but in spite of its ubiquity, its genetic origins remain a mystery. Popular myth maintains that Chemdawg and Hindu Kush parented OG Kush, passing on the distinct “kush” bud structure we see in many strains today. However, we can’t be sure because OG Kush first came from bag seed in the early 90s. The earliest propagators (now known as Imperial Genetics) are said to have brought the seeds out of Florida to Colorado and southern California, where it now flourishes. There are many different phenotypes of OG Kush, some of which include Tahoe OG, SFV OG, and Alpha OG.

OG Kush is cherished for its ability to crush stress under the weight of its heavy euphoria. It carries an earthy pine and sour lemon scent with woody undertones, an aroma that has become the signature of OG Kush varieties and descendants. With OG Kush, patients most commonly cite improvements in migraines, ADD/ADHD, and stress disorders.


Superglue is a hybrid strain bred by Seedism Seeds. A cross between Afghani and Northern Lights, Superglue inherits indica growth patterns along with a sweet caramel and pine aroma. Superglue brings calming relaxation to the mind and body, but leaves you functional and energetic enough for social activities or a productive afternoon.

Autoflowering Strains That Grow Quickly (7-12 Weeks)

Red Dwarf

Red Dwarf is a rarer strain of cannabis that is an autoflowering plant. This trait comes from its cannabis ruderalis genetics, which is a third variety of the plant that’s usually not bred due to its lower THC content. The wonders of selective breeding from Buddha Seeds have resulted in seeds that grow to adulthood in an incredibly short six weeks. This strain’s squat, small plants are easy to grow in smaller spaces, making it a popular choice for growers who want something simple and fast. Indica-dominant, Red Dwarf will eventually make you sleepy, but not without some relaxed euphoria first.


Hobbit by Kannabia Seeds is a resilient autoflowering variety with sweetness and strong elemental resistance. This strain has a sweet aroma that has been described as “strawberry candy” and an equally sweet smoke with latent earthy notes. Hobbit deftly combines stimulating Haze elements with a pervasive body buzz that is lightly weighted while remaining pleasant and functional. Many growers covet this autoflowering wonder for its quick 65-day flowering time and above-average yield.

White Ryder

White Ryder is Riot Seeds’ attempt to create a ruderalis version of White Widow by crossing Buddha Seeds’ White Dwarf against Lowryder. By blending two stout, autoflowering plants, Riot Seeds created a potent indica-dominant hybrid that finishes in under 80 days and can easily be hidden from view. Enjoy this flower for anti-anxiety and sleep-inducing effects.

Purple Cheese

Purple Cheese is an indica-dominant autoflowering hybrid that combines Purple #1, Blue Cheese, and Lowryder. Bred by Auto Seeds, Purple Cheese was designed to have a sweeter, less cheesy flavor than its Blue Cheese parent. It does, however, inherit a tight bud structure and a high CBD profile. With a palatable fruit aroma, Purple Cheese delivers powerful full-body effects best suited for night owls or patients treating pain. Colder climates will bring out this hybrid’s purple hues, and for best results, growers should keep this autoflowering variety between 50-80 cm in height.

Royal Haze

Royal Haze (or Royale Haze) by Dinafem Seeds is a mostly sativa strain bred from Skunk, Haze, and Northern Lights genetics. Taking after her Haze parent, this sativa inherits a spicy citrus flavor and buzzing, energetic effects that keep you alert and productive throughout the day. Outdoor growers will appreciate her flexibility and resilience even when the temperature drops, although her 10-11 week flowering cycle demands a bit of patience.

An autoflowering rendition of Royal Haze was bred by Royal Queen Seeds, who mixed Amnesia Haze, Skunk, and a ruderalis strain. Its effects are similarly energizing and cerebral.