Autoflower vs Feminized Seeds: What’s the Difference?

Autoflower vs Feminized Seeds: What’s the Difference?

Entering the world of cannabis cultivation is an exciting and rewarding journey, but it’s also filled with important choices that can significantly affect your success. One of the most crucial decisions a grower must make is selecting the type of seed to use. The choice between autoflower vs feminized seeds can influence factors like growth time, plant size, and yield. This guide aims to provide a detailed comparison to help growers of all experience levels make informed decisions.

What Are Autoflower Seeds?

Autoflower seeds, often referred to as automatic seeds, are unique due to their ability to flower based on age rather than light exposure. This trait is inherited from Cannabis ruderalis, a species native to regions with short growing seasons. As a result, autoflower plants begin to flower after three to four weeks, regardless of the light cycle.

Pros of Autoflower Seeds:

  1. Shorter Growth Cycle: Autoflowers mature quickly, usually within 8 to 12 weeks. This rapid lifecycle allows growers to enjoy multiple harvests in a single season, which is particularly advantageous for commercial growers or those seeking quick results.
  2. Compact Size: Due to their ruderalis genetics, autoflower plants tend to be smaller, making them ideal for discreet growing operations or indoor setups with limited space. They typically grow between 60 to 100 centimeters.
  3. Ease of Growth: Autoflowers are hardy and resilient, adapting well to varying conditions, making them suitable for beginners and those seeking a forgiving plant.

Cons of Autoflower Seeds:

  1. Lower Yields: The short lifecycle means that autoflowers don’t have as much time to grow and develop, resulting in smaller yields compared to feminized strains.
  2. Limited Training: Because of their rapid growth, high-stress training techniques like topping or pruning may not be feasible, limiting the grower’s ability to shape plant size and structure.
  3. Less Control: Since flowering begins automatically after a set time, growers can’t extend the vegetative stage to manipulate plant size or increase yields.

What Are Feminized Seeds?

Feminized seeds are bred to produce exclusively female plants, which are the ones responsible for developing cannabinoid-rich buds. Feminized seeds are created through selective breeding techniques that ensure all seeds carry only female chromosomes.

Pros of Feminized Seeds:

  1. High Yields: Feminized plants usually produce larger yields than autoflowers because of their extended growth period, allowing for bigger plants and more substantial buds.
  2. Controlled Vegetative Period: Growers can control the vegetative period by managing light cycles, allowing more flexibility for plant training and size manipulation.
  3. Stable Genetics: Feminized seeds generally offer stable genetics, providing predictable growth patterns, potency, and flavor profiles.

Cons of Feminized Seeds:

  1. Longer Growing Cycle: Feminized seeds require a longer growth period, often taking up to five to six months from seed to harvest. This extended time frame can be challenging for those seeking a quick turnaround.
  2. Height and Space Requirements: Some feminized strains can grow very tall, requiring ample space, which can be difficult for indoor growers with limited room.
  3. More Experience Needed: Managing light schedules, nutrients, and training techniques demands a deeper understanding of plant biology and cultivation practices, making them better suited for experienced growers.

Autoflower Vs Feminized Seeds

Autoflower vs Feminized Seeds: Key Differences

  1. Flowering Time

  • Autoflower Seeds: Flowering begins automatically after three to four weeks, resulting in a total grow time of 8 to 12 weeks. This characteristic allows for multiple harvests in a year, especially in outdoor environments.
  • Feminized Seeds: Flowering is triggered by changes in the light cycle, typically requiring 12 hours of darkness. The entire growth cycle from seed to harvest can last up to six months.
  1. Plant Size

  • Autoflower Seeds: Due to their rapid flowering cycle, autoflowers tend to remain compact and rarely exceed one meter in height. This makes them suitable for small grow spaces.
  • Feminized Seeds: These plants can grow significantly larger, especially with a longer vegetative period. Indoor plants can exceed two meters, while outdoor plants can grow even taller.
  1. Yield Potential

  • Autoflower Seeds: The shorter growth cycle limits the plant’s size and, subsequently, the yield potential. Typically, autoflower plants produce less compared to feminized strains.
  • Feminized Seeds: Extended growth periods allow feminized plants to grow larger and yield more. Well-trained plants can produce significantly higher yields.
  1. Growing Conditions

  • Autoflower Seeds: They adapt well to various conditions and climates, showing resilience against environmental stressors like temperature and humidity fluctuations.
  • Feminized Seeds: They require more controlled conditions, including precise light schedules, temperature control, and nutrient management, to ensure optimal growth.
  1. Harvest Frequency

  • Autoflower Seeds: Rapid growth cycles enable multiple harvests per season, especially useful for perpetual harvest systems where fresh plants are continuously started.
  • Feminized Seeds: These plants generally provide one harvest per season, unless perpetual harvesting techniques are used.

Choosing the Right Seed Type

Choosing between autoflower vs feminized seeds depends on your experience level, space, and growing goals.

Autoflower Seeds:

  • Best For: Beginner growers, those with limited space or short growing seasons, and cultivators seeking quick results. Autoflower seeds are also a good choice for growers who want multiple harvests per year.
  • Considerations: Ideal for fast turnaround, but growers should plan to stagger planting for continuous harvests due to smaller yields.

Feminized Seeds:

  • Best For: Experienced growers, those with ample space, and cultivators aiming for high yields and plant training. Feminized seeds are suitable for maximizing yields and experimenting with different plant training techniques.
  • Considerations: Suitable for maximizing yields and experimenting with different plant training techniques, though they require more time, space, and experience.

Cultivation Tips for Each Seed Type

Autoflower Seeds:

  1. Optimal Light Schedule: An 18- to 24-hour light schedule encourages robust growth and quick flowering, maximizing the plant’s short growing time. This also helps prevent stress, which can impact yields.
  2. Pot Size: A 5- to 10-liter pot is usually sufficient for most autoflowers. Smaller pots allow for better root management and prevent the plants from becoming root-bound.
  3. Nutrient Management: Autoflowers require fewer nutrients than feminized plants. Use a balanced feed that’s suitable for their short lifecycle, and be cautious not to overfeed.
  4. Minimal Training: Autoflowers respond best to low-stress training (LST) techniques that don’t interfere with their rapid growth. Avoid high-stress training like topping or super cropping, which can stunt growth.

Feminized Seeds:

  1. Light Schedule: During the vegetative stage, keep lights on for 18 hours daily. This promotes vigorous growth. Transition to a 12-hour light schedule to induce flowering.
  2. Pot Size: Use 20-liter or larger pots to accommodate extensive root systems and support the taller plant structure. The larger the pot, the more room the plant has to grow.
  3. Nutrient Management: Start with high-nitrogen nutrients for the vegetative stage, then transition to high-phosphorus feeds during flowering to support bud development.
  4. Plant Training: Experiment with topping, fimming, ScrOG (Screen of Green), and other techniques to maximize yields and shape the plant’s structure. Feminized seeds allow for more extensive training due to their longer lifecycle.

Autoflower Cannabis Plant

Case Studies: Real-World Examples

Autoflower Grower – Lucy’s Indoor Garden: Lucy, a hobbyist grower with limited space, chose autoflower seeds due to their small size and rapid growth. She planted a batch in a small grow tent with a basic LED light. Following a strict 20-hour light schedule and LST techniques, she harvested her first batch in 10 weeks. Though the yields were modest, the quality and speed of harvest exceeded her expectations.

Feminized Grower – Tom’s Outdoor Farm: Tom is an experienced grower with a large outdoor farm. He decided to use feminized seeds to maximize his yields. After preparing the soil and setting up drip irrigation, he planted a batch of feminized seeds. With careful training and a controlled light cycle, Tom’s plants grew over two meters tall and produced a bountiful harvest after 6 months.

Advanced Tips and Tricks for Growers

Autoflower Seeds:

  1. Staggered Planting: For continuous harvests, plant seeds in stages, ensuring a steady supply of mature plants ready for harvest.
  2. Soil Selection: Use light, airy soil mixes to promote faster root growth, enabling the plant to grow quickly.
  3. Supplemental CO2: Boosting CO2 levels in the grow room can increase growth rates and yields, though it’s best used by experienced growers.

Feminized Seeds:

  1. Extended Vegetative Phase: Extend the vegetative phase to allow the plant to grow bigger before transitioning to flowering. This requires precise light control but can dramatically improve yields.
  2. Advanced Training: Techniques like manifolding or mainlining can help growers shape the plant structure for better light penetration and higher yields.
  3. Perpetual Harvest: By using separate vegetative and flowering rooms, growers can create a perpetual harvest cycle, constantly cycling plants through the grow stages.

The Popularity of Autoflower vs. Feminized Seeds

In recent years, the cannabis cultivation industry has seen a significant shift in the popularity of seed types, reflecting the evolving needs of growers worldwide.

Autoflower Seeds:

Autoflower seeds have gained immense popularity, especially among beginner growers and those looking for fast-growing, compact plants. Their appeal lies in their simplicity and the ability to produce multiple harvests in a year, making them a favorite among home growers who want quick results. Additionally, the rise in legalization has encouraged a surge of novice cultivators, who often start with autoflower seeds due to their ease of use and resilience to common growing mistakes.

  • Rise of Home Growers: The growing acceptance and legalization of cannabis have empowered more individuals to start cultivating at home. Autoflower seeds, which require less space and time, have naturally become a popular choice for these home growers.
  • Commercial Applications: Small-scale commercial operations that focus on rapid turnover have also adopted autoflowers. Their quick cycles allow for continuous production and shorter time to market.
  • Improved Genetics: Advances in breeding have significantly improved the potency, yield, and flavor of autoflowers, dispelling the notion that they are inherently inferior to photoperiod strains.

Feminized Seeds:

Feminized seeds remain the gold standard for most serious growers due to their higher yield potential and flexibility in growth manipulation. Despite the growing popularity of autoflowers, feminized seeds have held their ground due to their superior yield potential and the opportunity they offer for advanced plant training techniques.

  • Yield and Quality: Experienced growers and commercial operations often prefer feminized seeds for their superior yield potential, potency, and control over the growth process. These seeds are essential for those aiming for maximum harvest size and plant quality.
  • Strain Variety: Feminized seeds offer a vast selection of strains, each with unique flavors, effects, and growing characteristics. This variety allows growers to tailor their crop to specific market demands or personal preferences.
  • Advanced Cultivation Techniques: Feminized seeds allow for advanced training techniques, such as topping and Screen of Green (ScrOG), that can significantly increase yields. This flexibility is crucial for growers with the knowledge and space to experiment.

Trends and Market Outlook

As legalization and acceptance continue to grow globally, the cannabis seed market will likely see both autoflower and feminized seeds coexisting and serving different segments. Autoflowers will continue to attract new growers and those with space limitations, while feminized seeds will remain a mainstay for experienced cultivators and commercial producers seeking quality and yields.

The ongoing advancements in breeding will further blur the lines between these two seed types, with breeders developing high-yielding autoflowers and faster-flowering feminized strains, offering growers more choices and flexibility than ever before.


Selecting the right seed type is a crucial step in cannabis cultivation that significantly impacts the growing experience and results. Autoflower seeds offer speed and ease, making them ideal for beginners and growers seeking quick results in small spaces. Feminized seeds provide flexibility and higher yields but require more time, space, and expertise.

Understanding the differences between these seed types enables growers to choose the best option based on their unique conditions, goals, and experience. With careful planning and execution, both autoflower and feminized seeds can lead to a successful and rewarding harvest.

Now that you understand the pros and cons of autoflower vs feminized seeds, shop the extensive collection of regularfeminized, and autoflower cannabis seeds at Seeds Here Now.


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