15 Fastest Flowering Strains to Grow from Seeds (Fast Growing Weed)

Some cannabis enthusiasts prefer growing their own plants from seeds rather than buying their marijuana from dispensaries. However, cultivating cannabis from seeds is a somewhat long and arduous process that can turn off some of them from growing their own.

Because of this, many breeders strived to create strains that offer a faster flowering time, eliminating much of the waiting period involved in the cultivation of marijuana.

With that said, here are the top 15 fastest flowering strains available on the market these days that both novice and veteran growers can grow from seeds. Check them all out below.

Top 15 Fastest Flowering Strains

Auto-flowering Strains

 #1. Sour Crack Auto

The Sour Crack Auto is an auto-flowering strain that combines the genetics of both the Green Crack Auto and 24 Carat strains. It contains a THC level of up to 20% and is considered one of the fastest auto-flowering strains available on the market these days.

Once the seeds have germinated, they have a growing period of up to 7 weeks and produce resinous and rock-hard buds. Because the plants themselves stay at only 20 to 28 inches tall, they are ideal for indoor cultivation but can also be grown outdoors or in greenhouses. 

This strain is fairly easy to grow and doesn’t require much care which makes it a good strain for beginner cultivators to start with. They also produce high enough yields at around 30 to 60g per plant when grown indoors and up to more than 60g when grown outdoors.

  • THC Level: 20%
  • Growing Period: Up to 7 weeks
  • Can be grown indoors, outdoors, or in greenhouses

 

#2.Alaskan Purple Auto

The Alaskan Purple Auto is a predominantly indica strain, composed of 90% indica, and was achieved by crossing the classic Kush strain with an unidentified Brazilian Sativa strain. Although it’s predominantly an indica strain, it grows large and produces high yields of 400 to 550g/m2 when grown indoors and only up to 200g per plant when grown outdoors.

It has an impressively fast growing time, taking only around 7 to 8 weeks from germination. This strain contains a THC level of up to 20%, making it quite potent. Moreover, this strain can be grown in almost any environment although outdoor cultivation can extend its life cycle by a week.

Nevertheless, it’s an easy enough strain to cultivate and produces higher yields as well so both beginner and veteran cultivators can benefit from it.

  • THC Level: 15 to 20%
  • Growing Period: 7 to 9 weeks
  • Can be grown indoors, outdoors, and in greenhouses

 

#3.Green-O-Matic Auto

The Green-O-Matic auto-flowering strain is a unique hybrid that’s composed of 80% indica, 10% Sativa, and 10% ruderalis, respectively. Its unique genetics was achieved by crossing several strains, namely the White Dwarf, Moroccan, Low Rider, and ruderalis strains. It contains a THC level of up to 15%.

It has a fast-growing period, taking only a maximum of 8 weeks to fully mature. Although it can be grown both indoors and outdoors, it produces a higher yield with indoor cultivation, producing a yield of up to 800g/m2

The plant itself is short, staying only at a height of 12 to 16 inches. This makes it a good option for urban cultivators with limited space.

  • THC Level: 15%
  • Growing Period: 8 weeks
  • Best grown indoors; outdoor cultivation requires a temperature higher than 15oC

 

#4.Chocolate Skunk Auto

Chocolate Skunk is an auto-flowering hybrid cannabis strain that was achieved by crossing the ruderalis and Chocolate Skunk genetics. It grows fairly tall for an auto-flowering strain, reaching a height of over 40 inches.

It’s considered a 60-day wonder because it only takes 60 days or 8 weeks for it to grow and be ready for harvest. The strain itself contains a moderately high level of THC, reaching a level of up to 17%.

It has an average yield, producing around 250g to 350g/m2 when grown indoors. When grown outdoors, the plant can be harvested anytime from April to November.

  • THC Level: 17%
  • Growing Period: 60 days or 8 weeks
  • Can be grown both indoors and outdoors

 

#5.Stardust Auto

The Stardust auto-flowering strain is a predominantly Sativa strain, having a composition of 55% Sativa, 30% indica, and 15% ruderalis. This strain is named as such because of its appearance, being coated with thick white crystals that are reminiscent of stardust.

It’s fairly compact, reaching only a maximum height of 24 inches, making it ideal for indoor cultivators with limited space. Nevertheless, its easy-to-grow nature allows for both outdoor and greenhouse cultivation as well. Additionally, it’s also a good option for beginner growers who are still learning the ropes.

It has a fast-growing period, taking only around 7 to 9 weeks from its seeds’ germination to flower and be ready for harvest. It has a moderately high amount of THC, containing only up to 17%. 

  • THC Level: 17%
  • Growing Period: 7 to 9 weeks
  • Can be grown indoors, outdoors, and in greenhouses

 

#6.Californian Snow Auto

The Californian Snow is a predominantly Sativa strain that is the result of crossing the genetics of an American Old School Hot California with a Canadian ruderalis. It’s a fast flowering strain that’s ready to be harvested in about 8 weeks after the germination of the seeds.

Its genetics make it easy to grow, requiring little care to thrive. As such, it’s ideal for beginner growers as well as veterans who want a fast-growing plant.

Although it’s a short plant, reaching only a height of 30 to 50 inches tall, it produces high yields. This is especially true when it’s grown indoors, offering a yield of about 400 to 550g per m2

It contains a THC level of about 19%, making it moderately potent yet effective.

  • THC Level: 19%
  • Growing Period: 8 weeks
  • Best grown indoors

 

#7.Chronic Ryder Auto

This particular strain is the result of crossing the genetics of the well-known Chronic strain with the Lowryder #2, the first auto-flowering strain on the market. It has a ratio of 50% Sativa to 50% indica. 

As a fast flowering strain, the Chronic Ryder takes only up to 9 weeks to produce its popular crystal-covered flowers. However, it has a lower THC content, only containing around 11.9% as opposed to the usual 15 to 20% range of the others.

It’s easy enough to grow so even complete novices can handle cultivating this strain. It produces medium to high yields when grown both indoors and outdoors, making it a viable option for commercial growers as well.

  • THC Level: 11.9%
  • Growing Period: 9 weeks
  • Can be grown indoors, outdoors, and in greenhouses

 

#8.Kush Van Stitch Auto

This impressively fast-acting and potent indica is the result of breeding the Lowryder #2 genetics with the OG Kush strain. It has a distinctly sturdy appearance due to its short stature, standing tall at 20 inches when grown indoors and 30 inches when grown outdoors.

It contains a THC level of 19%, making it moderately potent. It doesn’t produce high yields but with its fast flowering time, needing only 8 to 10 weeks to fully flower, you can grow them as often as you want.

It thrives both indoors and outdoors and is a fairly easy strain to cultivate, making it another excellent option for novice growers.

  • THC Level: 19%
  • Growing Period: 8 to 10 weeks
  • Can be grown both indoors and outdoors

 

Photoperiod Strains

#1.Quick Critical+

Despite being a photoperiod strain, a type that typically takes longer to flower than auto-flowering strains, the Quick Critical+ produces high yields at an incredibly fast rate. It takes only 7 weeks for it to produce flowers, making it one of the fastest flowering strains available on the market.

It contains a THC level of about 16 to 20%, making it fairly potent and effective. It’s a predominantly indica strain, containing around 75% indica and only 25% Sativa. This strain was achieved by crossing a female Critical+ 2.0 clone Auto with another photoperiod clone of the original Critical+.

It can be grown both indoors and outdoors, producing yields of up to 600g per m2 when cultivated indoors and up to 1250g per plant when grown outdoors.

  • THC Level: 16 to 20%
  • Growing Period: 7 weeks
  • Can be grown both indoors and outdoors

 

 #2.Gigabud

The Gigabud strain is a hybrid that resulted from crossing the genetics of the popular Northern Lights and Big Bud strains. It grows into a medium-sized plant and produces large quantities of fruity and resinous buds that are effective for calming the mind and body.

It’s one of the fastest flowering cannabis strains you could ever find on the market as it needs only a maximum of 5 to 6 weeks to produce large yields.

While it’s mostly known as a photoperiod strain, there’s also an auto-flowering version. It contains a THC level of around 16%, making it average in terms of potency. Regardless of this, it’s still effective and fairly easy to grow, perfect for novices.

  • THC Content: 16%
  • Growing Period: 5 to 6 weeks
  • Can be cultivated in both indoor and outdoor environments

 

#3.Green Poison (FAST version)

The result of breeding out the unique ruderalis gene found in the original Green Poison strain, this photoperiod version is composed of 70% indica and 30% Sativa, making it ideal for those who want to relax. It contains a high THC level of around 15 to 20%, thereby, inducing potent effects in users.

This fast version of the original and beloved Green Poison strain only takes around 6 weeks to fully flower, making it a great option for commercial growers. However, it should be noted that it’s fairly susceptible to fungi and can be challenging to handle.

As such, it’s not recommended for novice growers, but more experienced growers will have an easier time managing this plant. Despite being difficult to grow, it produces high yields both when grown indoors and outdoors. 

Indoors, it produces a yield of around 500g to 600 per m2 while outdoor conditions allow it to yield as much as 500g to 700g per plant.

  • THC Level: 15 to 20%
  • Growing Period: 6 weeks
  • Can be grown both indoors and outdoors

 

#4.Pineapple Express #2

The number 2 version of the original Pineapple Express is a fast flowering strain that requires only 5 to 6 weeks before being ready to harvest. It was achieved by crossing the genetics of the original Pineapple Express with a Skunk strain. 

Not only does it flower quickly, but it also produces incredibly high yields, especially when grown outdoors where it can become incredibly large. It has a yield of about 700g per m2 when grown in a controlled indoor environment but outdoors, it can produce as much as 900 to 1300g per m2.

It contains a THC level of about 15%, making it average in terms of potency. It has a strong resistance to both moisture and mold, making it the ideal choice for cultivators in humid climates. Aside from this, its growing difficulty is considered easy so beginners shouldn’t have much trouble with this strain.

  • THC Level: 15%
  • Growing Period: 5 to 6 weeks
  • Can be grown both indoors and outdoors

 

#5.Passion #1

Originating as an outdoor indica in California back in the 1970s, it eventually found its way to the Netherlands where it became a hit. For growers looking for a high-quality outdoor strain, then this is an excellent option to consider. Although it’s best grown outdoors, it can also thrive as an indoor strain, provided it’s given the right growing conditions.

It’s well-known for having stable genetics and an easy to grow nature, making it a good option for beginners as well. It produces high yields, offering as much as 250 to 750g per plant.

Aside from these, it’s considered a fast flowering indica strain as it only needs a maximum of 6 weeks to flower and be ready for harvesting. It contains a THC level of about 18.6%, making it potent and highly effective.

  • THC Level: 18.6%
  • Growing Period: 6 weeks
  • Can be grown both indoors and outdoors but thrives the most outdoors

 

#6.White Critical Express

The White Critical Express is an indica-dominant strain that resulted from crossing the genetics of the immensely popular strains Critical Mass and White Widow as well as a secret hybrid from the Kalashnikov Seeds’ inventory. 

It contains an impressively high THC level of about 21%, making it highly potent and effective. It produces high yields and is an easy strain to grow, making it a great option for both novice and advanced cultivators alike.

It takes only a maximum of 7 weeks to flower and thrives in both indoor and outdoor growing conditions. Indoors, it produces yields of up to 600g per m2 while outdoors, it has a slightly lower yield, averaging at about 300g per plant.

  • THC Level: 21%
  • Growing Period: 7 weeks
  • Thrives both indoors and outdoors

 

#7.C99 x Blueberry Fast

The C99 x Blueberry Fast is predominantly a sativa strain and is one of the fastest flowering strains available nowadays. It takes only around 6 to 7 weeks for it to fully flower and become ready for harvesting.

It’s a fairly potent strain, containing a THC level of up to 22%. It produces a high yield of about 350 to 450g per m2. It can be grown both indoors and outdoors although it will require more room when indoors to stretch out and grow as it can grow fairly large as a plant.

  • THC Level: 18 to 22%
  • Growing Period: 6 to 7 weeks
  • Can be grown both indoors and outdoors

 

Factors that Affect a Cannabis Strain’s Flowering Time

Like with any plant, several factors can contribute to its flowering time and overall growth. They are as follows:

  • Species and Strain Type

A strain’s genetics can have a large impact on their growing season. The closer their growing conditions are to their natural habitat, the easier it will be for the strain to adapt and flourish. This is why many breeders create strains that can best adapt to the local climate. 

For example, indica strains typically flower faster than sativa strains. Another would be whether the strain is an auto-flowering strain or a photoperiod strain.  Autoflowering strains tend to grow faster than photoperiod strains but the latter offers greater yields than the former.

  • Seasonal Cycles

Similarly, seasonal cycles can have a significant effect on a strain’s flowering time, especially when grown outdoors. For example, spring often offers a higher chance of growth due to the faster rate of nutrient absorption. Fall and winter, on the other hand, affect the amount of sunlight and temperatures needed for faster flowering times.

  • Environmental Conditions

As mentioned, cannabis strains grow best when cultivated in an environment that’s similar to their native habitat. These include factors like temperature, humidity, sunlight, and location. Water and nutrients also contribute to the flowering time of your chosen cannabis strain.

Growing cannabis strains outdoors mean you have less control over these factors than when growing them indoors. However, indoor cultivation often means less space for your plant to grow.

 

Final Thoughts

Fast flowering cannabis strains often produce high yields in a shorter period, allowing growers to reap the benefits of such strains more quickly. The top 15 aforementioned strains are some of the best strains available these days and choosing one of them will eliminate much of the waiting time typical when growing your own cannabis plants.

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