What Is Auto-Flowering Seeds: Meaning, Benefits, & Growing Tips

As an Amazon Associate I earn from qualifying purchases.

what is auto flowering seeds mean

In the world of cannabis cultivation, there exists a fascinating and innovative category of seeds known as auto-flowering seeds. These seeds have sparked a revolution in the art of growing cannabis, offering a unique set of advantages and characteristics that have garnered attention and popularity among both novice and experienced growers alike.

Unlike traditional cannabis seeds, which rely on changes in light cycles to trigger flowering, auto-flowering seeds have a distinctive genetic trait that enables them to flower automatically after a certain period of time, typically within a few weeks of germination. This remarkable quality has significant implications for cultivators, as it simplifies the cultivation process and offers greater flexibility in terms of lighting and environment.

In this comprehensive guide, we will delve into the intricacies of auto-flowering seeds, exploring what they are, how they work, their benefits and drawbacks, and key considerations for successful cultivation. Whether you’re a seasoned cannabis grower looking to expand your repertoire or a newcomer eager to embark on your first cultivation journey, understanding auto-flowering seeds is essential for unlocking the full potential of your cannabis cultivation endeavors. So, let’s dive in and discover the magic of auto-flowering seeds in the world of cannabis cultivation.

Characteristics of Auto-Flowering Seeds

Genetic Traits

Auto-flowering cannabis seeds possess several distinct genetic traits:

  1. Ruderalis Genetics: Auto-flowering strains typically have Cannabis ruderalis genetics. This subspecies of cannabis originated in regions with harsh climates, which led to the development of auto-flowering traits as a survival mechanism.
  2. Autoflowering Gene: The key genetic trait of auto-flowering seeds is the presence of an “autoflowering” gene. This gene allows the plant to switch from the vegetative stage to the flowering stage based on age, rather than relying on light cycles as photoperiodic strains do. This means that auto-flowering plants will automatically start flowering after a certain number of weeks, usually regardless of the light conditions they are exposed to.
Life Cycle

The life cycle of auto-flowering cannabis plants differs from photoperiodic strains:

  1. Shorter Life Cycle: Auto-flowering plants have a much shorter life cycle compared to photoperiodic strains. They typically complete their entire growth cycle, from seed to harvest, in as little as 8 to 12 weeks.
  2. Flowering Onset: Auto-flowering plants typically begin flowering within 2 to 4 weeks of germination. This rapid onset of flowering is one of their defining features.
  3. No Photoperiod Sensitivity: Unlike photoperiodic strains that require specific light schedules (e.g., 12 hours of light and 12 hours of darkness) to trigger flowering, auto-flowering plants do not rely on light cycles. They will flower automatically based on their genetic programming.
Size and Structure

Auto-flowering plants exhibit certain characteristics in terms of size and structure:

  1. Compact Size: Auto-flowering plants are generally smaller in stature compared to photoperiodic strains. They typically grow to a height of 1 to 3 feet (30 to 90 cm), making them well-suited for small spaces and stealthy outdoor cultivation.
  2. Bushy Growth: Auto-flowering plants often develop a bushy and compact growth pattern with multiple side branches. This growth structure is influenced by their ruderalis genetics.
  3. Limited Vegetative Growth: Because auto-flowering plants transition to the flowering stage relatively quickly, they have a limited period of vegetative growth. This can affect the overall yield, as there is less time for the plant to develop a large canopy.
  4. Stealthy and Discreet: Due to their compact size and rapid growth cycle, auto-flowering strains are popular among growers looking for discreet and low-maintenance cultivation options.

These characteristics make auto-flowering cannabis seeds a unique and convenient choice for many growers, especially those who want quick harvests or have space limitations. However, it’s important to note that auto-flowering strains may have different cannabinoid profiles and yield potential compared to photoperiodic strains, so growers should consider their specific needs and preferences when selecting seeds.

How Auto-Flowering Seeds Work

The Role of Photoperiodism in Traditional Cannabis Plants

Photoperiodism is a crucial factor in the life cycle of traditional photoperiodic cannabis plants. Here’s how it works:

  1. Light Sensitivity: Photoperiodic cannabis plants rely on the duration of light and darkness (photoperiod) to determine their growth stages. They have a sensitivity to changes in light cycles.
  2. Vegetative Growth: In the vegetative stage, photoperiodic cannabis plants require longer hours of light (typically 18-24 hours of light per day) to maintain vegetative growth. During this stage, they focus on developing leaves, stems, and branches.
  3. Flowering Induction: To trigger the flowering stage, photoperiodic plants need a change in their light cycle, usually a reduction in the number of hours of light they receive. Most commonly, this change involves providing 12 hours of light and 12 hours of darkness (a 12/12 light cycle). This mimics the decreasing daylight hours of late summer and early fall, which signals to the plant that it’s time to reproduce.
Lack of Photoperiodism in Auto-Flowering Seeds

Auto-flowering seeds, on the other hand, lack the sensitivity to photoperiodism in the same way that photoperiodic plants do. Here’s why:

  1. Autoflowering Gene: Auto-flowering cannabis strains contain a unique genetic trait known as the autoflowering gene. This gene allows auto-flowering plants to transition from the vegetative stage to the flowering stage based on age rather than light conditions.
  2. Age-Dependent Flowering: Auto-flowering plants are programmed to start flowering after a certain number of weeks, regardless of the amount of light they receive. This means that they will automatically begin to produce flowers at a specific point in their life cycle, typically 2 to 4 weeks after germination.
Triggers for Flowering in Auto-Flowering Plants

Auto-flowering plants have specific triggers for flowering:

  1. Chronological Age: As mentioned, auto-flowering plants initiate flowering based on their age. This age-dependent flowering is predetermined by their genetics. It’s common for auto-flowering strains to begin flowering around the third or fourth week of growth, but this can vary depending on the specific strain.
  2. Limited Vegetative Stage: Auto-flowering plants have a relatively short vegetative stage because they transition to flowering quickly. This is one reason why they are smaller and more compact compared to photoperiodic plants.
  3. Ruderalis Genetics: The autoflowering gene in auto-flowering strains is inherited from the Cannabis ruderalis subspecies, which evolved in harsh climates with short growing seasons. This genetic adaptation allows them to complete their life cycle quickly, which is advantageous in challenging environments.

In summary, auto-flowering seeds work differently from photoperiodic cannabis plants because they do not rely on changes in light cycles to initiate flowering. Instead, they automatically transition to the flowering stage based on their age, thanks to the presence of the autoflowering gene inherited from Cannabis ruderalis genetics. This unique characteristic makes auto-flowering strains popular for their rapid growth and ease of cultivation.

Advantages of Auto-Flowering Seeds

Shorter Growth Cycle
  1. Rapid Harvests: Auto-flowering plants have a significantly shorter life cycle compared to photoperiodic strains. They typically complete their entire growth cycle, from seed to harvest, in as little as 8 to 12 weeks. This allows growers to harvest their cannabis more quickly, which can be advantageous for those seeking a faster turnaround.
Smaller Stature

2. Space Efficiency: Auto-flowering plants tend to be smaller in size, typically reaching a height of 1 to 3 feet (30 to 90 cm). This compact stature makes them suitable for growers with limited space, both indoors and outdoors. It also makes them easier to conceal for discreet cultivation.

Discreet Cultivation

3. Stealthy Growth: The small size and bushy structure of auto-flowering plants make them ideal for discreet cultivation. They can be grown in small, hidden spaces, balconies, or gardens without drawing too much attention.

Multiple Harvests Per Year

4. Continuous Cultivation: Another advantage of auto-flowering strains is that they allow for multiple harvests in a single growing season. Since they have a short life cycle, you can stagger your planting to ensure a continuous supply of fresh cannabis throughout the year, especially in regions with longer growing seasons or when growing indoors.

  1. Reduced Light Requirements: Auto-flowering plants do not require strict light schedules like photoperiodic plants. This means you can have multiple batches at different stages of growth under the same lighting system, further increasing your yield potential.

It’s important to note that while auto-flowering seeds offer these advantages, they also come with some trade-offs, such as potentially lower yields and different cannabinoid profiles compared to photoperiodic strains. Growers should consider their specific goals and constraints when deciding whether auto-flowering seeds are the right choice for their cannabis cultivation projects.

Considerations for Successful Cultivation

Choosing the Right Strain
  1. Climate and Environment: Select a strain that is well-suited to your local climate and growing environment. Some auto-flowering strains are better suited for indoor cultivation, while others thrive outdoors.
  2. Desired Effects: Consider the cannabinoid and terpene profiles of the strain to ensure it aligns with your desired effects and therapeutic benefits.
  3. Yield Expectations: Different auto-flowering strains have varying yield potentials. Research and choose a strain that meets your yield expectations and goals.
Lighting Requirements
  1. Light Schedule: Auto-flowering plants do not require specific light schedules to initiate flowering, but they still need adequate light for healthy growth. Indoors, providing 18-20 hours of light during the vegetative stage and 12-14 hours during the flowering stage is a common practice.
  2. Light Quality: Use appropriate lighting systems such as high-intensity discharge (HID) lights, compact fluorescent lights (CFLs), or light-emitting diodes (LEDs) that provide the right spectrum of light for all growth stages.
  3. Light Intensity: Ensure that the light intensity is sufficient for your plants, and adjust the distance between the light source and the canopy as the plants grow to prevent light burn.
Nutrient Needs
  1. Nutrient Schedule: Develop a feeding schedule that matches the growth stages of your auto-flowering plants. Start with a balanced nutrient formula and adjust as needed based on plant health and deficiencies.
  2. pH Levels: Monitor and maintain the pH levels of your growing medium to ensure optimal nutrient uptake. Cannabis plants generally thrive in a pH range of 6.0 to 6.8.
  3. Avoid Overfeeding: Auto-flowering plants are generally more sensitive to nutrient imbalances than photoperiodic plants. Avoid overfeeding, as it can lead to nutrient burn and other problems.
Pruning and Training Techniques
  1. Low-Stress Training (LST): LST involves gently bending and tying down branches to encourage even canopy growth and increase light penetration. LST can help maximize yields in the limited vegetative stage of auto-flowering plants.
  2. Topping and Fimming: While some growers employ these techniques to increase yields, they should be done with caution on auto-flowering strains, as they can slow down growth and reduce overall harvest size.
  3. Defoliation: Pruning or removing some lower, shaded leaves can improve airflow and light distribution within the plant, but avoid excessive defoliation, as it can stress the plant.
Pest and Disease Management
  1. Prevention: Implement preventative measures such as using clean growing equipment, maintaining proper humidity levels, and inspecting plants regularly for signs of pests or diseases.
  2. Organic Pest Control: Consider using organic pest control methods like neem oil, insecticidal soap, or predatory insects to manage pests without harmful chemicals.
  3. Early Detection: Detect and address pest or disease issues as early as possible to minimize damage and protect your crop.
  4. Proper Ventilation: Ensure adequate airflow and ventilation in your grow space to reduce the risk of mold and mildew.
  5. Quarantine New Plants: If introducing new plants to your growing area, quarantine them for a period to ensure they are free from pests and diseases before placing them near established plants.

By carefully considering these factors and adapting your cultivation practices to the specific needs of auto-flowering cannabis plants, you can increase your chances of a successful harvest. Keep in mind that each strain may have unique requirements, so it’s important to research and understand the specific needs of the strain you choose to grow.

Drawbacks and Limitations

Reduced Yield per Plant
  1. Smaller Plants: Auto-flowering plants are typically smaller in size compared to photoperiodic strains. Their compact stature can lead to smaller yields per individual plant.
  2. Limited Vegetative Growth: Auto-flowering strains have a short vegetative stage, which means they have less time to develop a large canopy and accumulate biomass compared to photoperiodic plants. This can result in smaller overall yields.
  3. No Time for Recovery: If an auto-flowering plant encounters stress or nutrient deficiencies during its short life cycle, it may not have enough time to recover fully, potentially affecting yield and quality.
Potency Variations
  1. Genetic Variability: The potency and cannabinoid profiles of auto-flowering strains can vary significantly from one strain to another. Some auto-flowering strains may have lower THC levels or different ratios of cannabinoids compared to photoperiodic varieties.
  2. Limited Breeding Options: Due to the unique genetics of auto-flowering plants, breeders have fewer opportunities to create new strains with specific cannabinoid profiles. This can limit the variety of options available to growers.
Limited Time for Recovery from Mistakes
  1. Reduced Margin for Error: Auto-flowering plants have a fixed timeline for growth and flowering. If mistakes are made during cultivation, such as overfeeding, pests, or environmental stress, there is limited time to correct these issues before the plant reaches maturity.
  2. Less Time for Learning: Novice growers may find auto-flowering strains less forgiving because they have a shorter life cycle and less time for growers to learn and adapt their cultivation techniques.
  3. Faster Decision-Making: Growers need to make quick decisions and adjustments in response to plant issues, which can be challenging for beginners or those who prefer a more relaxed cultivation pace.
  4. Training Limitations: Auto-flowering strains are less amenable to extensive training techniques like topping and supercropping due to their short vegetative stage. This limits the ability to shape the plant for maximum yield.

It’s important to note that while auto-flowering strains have these limitations, they also have their own unique advantages, such as rapid growth and multiple harvests per year. The choice between auto-flowering and photoperiodic cannabis plants depends on the specific goals and circumstances of the grower. Experienced growers may use auto-flowering strains strategically to complement their overall cultivation plans, while beginners may appreciate the simplicity of auto-flowering plants.

Popular Auto-Flowering Strains

what is auto flowering seeds mean

Examples of Well-Known Auto-Flowering Strains

  1. Lowryder:
    • Genetics: Lowryder was one of the first auto-flowering strains and has been used in breeding many other auto-flowering varieties.
    • Characteristics: It’s known for its short stature (usually under 1 foot tall) and rapid growth, with a life cycle of around 8-9 weeks. It’s a good choice for stealthy or indoor growing.
  2. Northern Lights Auto:
    • Genetics: A popular auto-flowering version of the classic Northern Lights photoperiod strain.
    • Characteristics: Northern Lights Auto retains the relaxing and euphoric effects of the original strain. It’s known for its dense, resinous buds and typically finishes in about 9-10 weeks from seed to harvest.
  3. Blueberry Auto:
    • Genetics: An auto-flowering version of the legendary Blueberry strain.
    • Characteristics: Blueberry Auto is famous for its sweet and fruity flavor profile, along with its relaxing indica effects. It usually matures in around 8-9 weeks and produces compact, resin-coated buds.
  4. Amnesia Haze Auto:
    • Genetics: An auto-flowering adaptation of the classic sativa-dominant strain Amnesia Haze.
    • Characteristics: Despite being an auto-flowering strain, Amnesia Haze Auto retains the uplifting and cerebral effects of the original. It has a longer flowering time (around 10-12 weeks) but can produce impressive yields.
  5. Girl Scout Cookies Auto:
    • Genetics: An auto-flowering version of the popular hybrid strain Girl Scout Cookies (GSC).
    • Characteristics: Girl Scout Cookies Auto inherits the sweet and earthy flavor profile of GSC. It usually matures in about 9-10 weeks and produces potent, resinous buds with a balanced hybrid effect.

Unique Characteristics of Each Strain

  • Lowryder: Known for its small size and rapid growth, making it ideal for stealthy cultivation. It has a mild, relaxing effect.
  • Northern Lights Auto: Maintains the classic Northern Lights qualities of relaxation and euphoria, with a shorter life cycle than the photoperiod version.
  • Blueberry Auto: Offers a delightful, fruity flavor and relaxing indica effects in a compact plant.
  • Amnesia Haze Auto: Provides a sativa-like cerebral high with a longer flowering time compared to other auto-flowering strains.
  • Girl Scout Cookies Auto: Combines the beloved GSC flavor with the convenience of auto-flowering genetics, offering a well-balanced hybrid experience.

These are just a few examples, and there are many other auto-flowering strains available, each with its own unique combination of flavor, effects, and growing characteristics. When choosing an auto-flowering strain, consider your preferences in terms of flavor and effects, as well as your growing conditions and experience level.


Auto-flowering cannabis seeds have gained popularity among growers for their unique characteristics and advantages, as well as their specific drawbacks. These seeds offer a shorter growth cycle, smaller stature, discreet cultivation options, and the potential for multiple harvests per year. However, they come with limitations such as reduced yield per plant, potency variations, and a limited window for recovery from mistakes.

Successful cultivation of auto-flowering cannabis plants requires careful consideration of factors such as choosing the right strain, providing appropriate lighting, managing nutrient needs, employing effective pruning and training techniques, and implementing pest and disease management strategies.

Several well-known auto-flowering strains, each with its own distinct qualities and effects, are available to cater to the diverse preferences and needs of growers and consumers alike.

Ultimately, the choice between auto-flowering and photoperiodic cannabis strains depends on the grower’s goals, experience, and specific cultivation circumstances. Both types of cannabis plants have their place in the world of cultivation, and choosing the right one depends on individual preferences and priorities.

Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Scroll to Top