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Autoflowering Cannabis Seeds: What Are They and How to Grow Them

Introduction to Autoflowering Cannabis Seeds

Autoflowering cannabis seeds have gained popularity among growers due to their unique characteristics and ease of cultivation. Unlike photoperiod strains, which require specific light schedules to trigger flowering, autoflowering seeds automatically transition from the vegetative stage to the flowering stage based on their age and development.

Autoflowering seeds have their origins in Cannabis ruderalis, a subspecies of cannabis known for its short stature, quick life cycle, and ability to flower regardless of light conditions. By crossbreeding ruderalis with traditional cannabis strains, breeders were able to create seeds that retain the autoflowering trait while incorporating the desired characteristics of other cannabis varieties.

Advantages and Disadvantages of Growing Autoflowering Seeds

Autoflowering cannabis seeds offer several advantages that make them attractive to growers:

Rapid Growth and Short Life Cycle:

Autoflowering plants have a significantly shorter life cycle compared to photoperiod strains. They typically go from seed to harvest in around 8 to 12 weeks, making them an excellent choice for growers seeking quicker results.

Compact Size:

Autoflowering strains tend to be smaller in stature, making them suitable for indoor cultivation or discreet outdoor growing. Their compact size also allows for more flexibility in terms of space and grow room setup.

Easy Cultivation:

Autoflowering seeds are relatively easy to grow, even for beginners. They are resilient and can tolerate fluctuations in environmental conditions. Additionally, their automatic flowering feature eliminates the need for complex light schedules, simplifying the cultivation process.

However, it’s important to consider the potential disadvantages of growing autoflowering seeds:

Lower Yield:

Autoflowering strains typically produce smaller yields compared to photoperiod strains. This is partly due to their compact size and shorter vegetative period. However, advancements in breeding have led to the development of high-yielding autoflowering varieties.

Less Control over Vegetative Period:

With autoflowering plants, you have less control over the vegetative phase since they automatically transition to flowering. This means you have a limited window of time to train and manipulate the plants before they start flowering.

How to Choose the Best Autoflowering Cannabis Seeds

When selecting autoflowering cannabis seeds, it’s essential to consider several factors to ensure the best possible outcome:

Genetics and Strain Selection:

Look for reputable seed banks and breeders known for their high-quality autoflowering genetics. Consider the characteristics you desire, such as aroma, potency, and growth traits, and choose a strain that aligns with your preferences and cultivation goals.

Yield Potential:

Consider the potential yield of the autoflowering strain you’re interested in. Look for information on the average yield per plant or per square meter provided by the seed bank or breeder. Keep in mind that some autoflowering strains have been specifically bred for high yields.

Reviews and Recommendations:

Read reviews and seek recommendations from experienced growers or online cannabis communities. Their insights and firsthand experiences can help you make informed decisions and narrow down your choices.

Optimal Growing Conditions for Autoflowering Seeds</h2 > Providing the right growing conditions is crucial for the successful cultivation of autoflowering cannabis seeds. Here are some key considerations:


Autoflowering plants thrive with at least 18-20 hours of daily light during the vegetative stage. This can be achieved using fluorescent grow lights, high-intensity discharge (HID) lamps, or light-emitting diodes (LEDs). Some growers opt for a 24-hour light cycle throughout the entire life cycle of the plant.

Temperature and Humidity:

Maintain a temperature range of around 68-78°F (20-25°C) during the vegetative stage and slightly lower during flowering. Keep humidity levels between 40-60% to prevent mold and mildew growth.

Air Circulation and Ventilation:

Good air circulation and proper ventilation are essential to prevent stagnant air and promote healthy growth. Use fans or ventilation systems to ensure a steady flow of fresh air and minimize the risk of pests and diseases.

Growing Medium and Nutrients:

Choose a suitable growing medium for your autoflowering plants, such as soil, coco coir, or hydroponic systems. Use nutrient-rich soils or provide appropriate nutrient solutions to support healthy growth throughout the plant’s life cycle.

Common Mistakes to Avoid When Growing Autoflowering Seeds

To maximize your success with autoflowering seeds, it’s important to avoid common pitfalls:


Overwatering is a common mistake that can lead to root problems and hinder the growth of autoflowering plants. Allow the growing medium to dry out slightly between waterings and adjust the frequency based on the plant’s needs.

Insufficient Lighting:

Providing adequate light is crucial for the healthy development of autoflowering plants. Insufficient lighting can result in weak and elongated plants with lower yields. Invest in high-quality grow lights and ensure they are positioned at the appropriate distance from the plants.

Excessive Training:

While some training techniques can be beneficial for autoflowering plants, excessive or aggressive training can cause stress and hinder growth. Avoid extensive pruning or high-stress training methods that may delay flowering or negatively impact the plant’s overall health.

When and How to Harvest Autoflowering Cannabis Plants

The timing of the harvest is crucial for achieving the desired potency and effects of your autoflowering plants. Most autoflowering strains have a relatively short flowering period, typically around 7-9 weeks from germination.

Observe the plants closely and look for visual cues such as the development of trichomes (the resinous crystals on the buds) and the changing color of pistils (the small hairs on the flowers). Use a magnifying tool to examine the trichomes and harvest when they reach the desired level of maturity.

Harvesting is typically done by cutting the entire plant or individual branches and trimming away the fan leaves. Hang the harvested plants upside down in a well-ventilated and dark area with moderate humidity to dry. Once the buds are dry, they can be further trimmed and cured for optimal flavor and potency.

Comparing Autoflowering Seeds to Regular Seeds: Which Is Better?

The choice between autoflowering seeds and regular photoperiod seeds depends on various factors and personal preferences.

Autoflowering seeds are ideal for growers seeking a quicker turnaround time and a more straightforward cultivation process. They are also suitable for those with limited space or outdoor growers who want to harvest multiple times in a single season.

Regular photoperiod seeds provide more control over the growth cycle and allow for advanced training techniques. They are favored by experienced growers who prioritize specific traits, flavors, or effects and are willing to invest more time and effort into the cultivation process.

Best Autoflowering Strains for Indoor and Outdoor Cultivation

Choosing the best autoflowering strain depends on your specific preferences and growing conditions. Here are a few popular autoflowering strains suitable for both indoor and outdoor cultivation:

Amnesia Haze Auto:

This strain is known for its uplifting and euphoric effects. It has a relatively long life cycle for an autoflowering strain, taking around 10-12 weeks from seed to harvest.

Northern Lights Auto:

A classic strain with a fast flowering time of around 8-9 weeks. It produces dense buds and has a potent relaxing effect.

Girl Scout Cookies Auto:

Known for its sweet and earthy flavors, this strain offers a balanced blend of euphoria and relaxation. It typically flowers in around 8-9 weeks.

Blueberry Auto:

A popular choice for its fruity aroma and relaxing effects. It has a relatively short flowering time of 8-9 weeks.

Caring for Autoflowering Cannabis Plants: Tips for Healthy Growth

To ensure healthy growth and maximize yield with your autoflowering plants, consider the following tips:

Start with Quality Seeds:

Choose reputable seed banks or breeders to ensure you begin with high-quality autoflowering seeds with reliable genetics.

Provide Adequate Lighting:

Ensure your plants receive sufficient light throughout the day, especially during the flowering stage. Optimal light intensity and spectrum are crucial for robust growth and bud development.

Don’t Overfeed:

Avoid overfeeding your autoflowering plants with nutrients, as they are generally more sensitive to nutrient burn. Start with a mild nutrient regimen and monitor your plants’ response.

Monitor Watering:

Pay attention to your plants’ watering needs and avoid overwatering. Provide water when the growing medium is slightly dry, and adjust the frequency based on the plant’s size and environmental conditions.

Use Proper Containers:

Choose appropriately sized containers with good drainage to allow for healthy root development and prevent waterlogging.

Stay Vigilant against Pests and Diseases:

Regularly inspect your plants for any signs of pests or diseases. Take preventive measures and address any issues promptly to ensure your plants remain healthy throughout their life cycle.

By following these guidelines and adapting them to your specific growing conditions, you can cultivate healthy and productive autoflowering cannabis plants.