How Tall Do Autoflowers Get


With premium genetics and careful selection, Growers Choice provides high-quality auto-flowering seeds, ensuring robust and tall plant growth. Keep reading to learn more about autoflowering plants and how to grow them at home in your own cannabis garden.

What is the Average Height for Auto-flowering Plants?

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What Are Autoflowering Cannabis Plants?

Auto-flowering cannabis plants come in all shapes and sizes, and their height depends on genetics, environment, and how you take care of them. On average, auto-flowering seeds typically reach a height ranging from 1 to 3.5 feet, with the potential for even greater heights when grown outdoors. When it comes to sativa-dominant auto-flowering seeds, they are known for their taller stature and can surpass 1.80 meters under optimal conditions.

Pot Size and Environmental Conditions

Growers should keep in mind that the size of the pot will make a difference, as large size pots mean more room for the roots to spread out, potentially leading to taller plants. The size of the pot directly influences the root system, nutrient uptake, and overall growth of auto-flowering seeds. Larger pots provide more space for the roots to spread out and explore, encouraging a healthier and more extensive root system. This, in turn, supports the plant’s overall growth and stability. In more spacious or outdoor settings, larger pots offer the roots the freedom to expand, potentially leading to larger and more vigorous plants.

Choosing the right autoflower pot size can affect auto-flowering seeds in terms of temperature, humidity, and airflow. Smaller pots can be prone to temperature fluctuations, as they heat up and cool down more quickly. Larger pots, on the other hand, offer a more stable environment for the roots. In regions with extreme temperature variations, larger pots act as a buffer, helping to maintain a more consistent soil temperature. This can be especially beneficial for auto-flowering seeds, which prefer a stable and moderate environment.

In regards to humidity levels, the pot size influences the soil’s water retention capacity. Larger pots generally retain moisture for a more extended period, reducing the frequency of watering. In areas with low humidity, larger pots help prevent the soil from drying out too quickly. Conversely, in high-humidity environments, smaller pots may mitigate the risk of overwatering and promote better airflow around the plant.

Large pots are the best choice for airflow for auto-flowering seeds. The space around the roots in larger pots allows for better airflow and aeration, preventing issues like waterlogged soil. In areas with limited airflow, such as indoor setups or crowded gardens, larger pots can aid in maintaining a healthier root environment by improving ventilation.

Vegetative Stage, Flowering Stage, and Harvest Time

The vegetative stage for auto-flowering seeds sets the foundation for robust growth and development, determining the plant’s overall size and structure. As autoflowers transition into the flowering stage, the critical period for bud formation begins, influencing the quality and quantity of the final yield. Harvest time is paramount, representing the culmination of the plant’s life cycle and determining the peak potency and flavor profile of the buds, making precise timing a crucial factor for successful auto-flowering cultivation.

Healthy Growth During the Vegetative Phase

During the vegetative stage of auto-flowering cannabis plants, promoting healthy growth is pivotal. Growers should pay attention to nutrient levels and watering practices because providing ample water and a balanced nutrient regimen is crucial, to ensure optimal development. Nutrient intake helps auto-flowering seeds grow strong and tall. An appropriate balance of fertilizers will provide ample access to nutrients, prevent nutrient deficiencies, and result in robust growth. Along with access to nutrients, growers also shouldn’t forget about watering practices, pH levels, and humidity levels to further influence plant growth.

Transitioning to Flowering Stage and Growth During That Time

The transition to the flowering stage in cannabis plants marks a pivotal period characterized by dramatic changes in plant growth and development. Typically triggered by the age of the plant rather than changes in light, this shift initiates the formation of vibrant and resinous buds. The first sign of flowering manifests as small white pistils, delicate hair-like structures that emerge at the nodes where branches meet the main stem. These pistils play a crucial role in the reproductive phase, capturing pollen for seed development. As the flowering time progresses, the plants undergo significant vertical growth, producing a plethora of pistils that eventually evolve into the resinous, cannabinoid-rich buds prized by cannabis enthusiasts.

Harvest Time Impact on Final Plant Size

The harvest time of auto-flowering plants plays a significant role in determining their final size. The timing of the harvest can influence how much the plants stretch during their life cycle, impacting their overall stature.

Autoflower strains can exhibit variations in growth rates, with some maturing faster than others. Faster-growing strains may reach their peak height relatively quickly, making an earlier harvest more suitable. On the flip side, slower-growing strains might require more time to reach their full maturity, necessitating a later harvest to ensure the buds fully develop.

Light Cycle and Environmental Factors

Light is essential for the healthy development of auto-flowering seeds, whether it’s the sun or artificial glow, it can impact plant height.

Hours of Light Per Day

Auto-flowering seeds love their light–soaking up 18 to 20 hours of light a day. Getting the light schedule right is a key role in the success of plant growth. Unlike photoperiod plants, an autoflower cannabis plant doesn’t depend on changes in light to start flowering. While auto-flowering cannabis plants can technically tolerate 24 hours of light, providing a brief dark period can be beneficial.

With auto-flowering seeds, growers have to follow and keep the right light schedule if they want to maximize yields and resin production. Consistency is key. Poor lighting, sudden changes, or interruptions in the light cycle can put stress on the plants. Generally, a well-maintained 18/6 or 20/4 light schedule during the vegetative growth stage ensures that the auto-flowering seeds receive sufficient energy for plant growth. Resin production is optimized with a stable light schedule. However, once again, autoflowers don’t actually require a change to their light/dark schedule in order to transition from their vegetative growth stage to their flowering phase.

Direct Sunlight vs. Indoor Growing

With plenty of sunlight outdoors, auto-flowering seeds thrive in the natural sun. With outdoor growing, they might not be as tall as photoperiod plants, but they can still pull off some decent yields. Auto-flowering seed’s unique genetics allow them to start flowering without relying on changes in light. Outdoor growers can rest assured that auto-flowering cannabis plants can stretch toward the sun, potentially reaching impressive heights.

Growing autoflower seeds inside gives indoor growers control over the environment, but it’s still important to have the right light because poor lighting can affect growth. An indoor grow demands meticulous environmental control, especially for auto-flowers. Maintaining the right temperature, humidity, and airflow becomes crucial to ensure these autoflower plants thrive within the confined indoor space, influencing their final yield. Because of the fixed lifespan of auto-flowers, they tend to be an average size or shorter in stature but can still produce substantial yields. Auto-flowering plants can benefit from horizontal training techniques such as; topping, low-stress training, and other methods that can encourage lateral growth, maximizing light exposure to bud sites for plant growth.

Low-Stress Training (LST) for Experienced Growers

Experienced growers employ low-stress training techniques to sculpt cannabis plants without hindering their growth. Growers can use the tie-down method, strings, or twist ties to gently secure branches. Doing so encourages horizontal growth and allows more light penetration for even bud development. In the tie-down method, growers delicately fasten strings or ties to the higher branches, gently bending them outward. This promotes lateral growth of the marijuana plant, preventing a single dominant cola and encouraging an even canopy. The technique is flexible, letting cultivators adapt to their plants’ unique needs. For a more comprehensive approach, growers turn to the Screen of Green (ScrOG) method. With this training technique, screens or trellising systems are introduced to guide the canopy. As the marijuana plants grow, branches are woven through the screen, ensuring an even canopy and maximizing light exposure. The ScrOG training technique is an effective way to control height, enhance yields, and optimize light distribution throughout the entire cannabis garden.

Different Autoflower Strains

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Growers Choice is a reliable source of high-quality auto-flowering seeds. With a diverse selection of strains, Growers Choice seeds cater to both beginner growers and experienced growers, ensuring a wide variety of options to suit different preferences and cultivation environments. Growers Choice seeds have premium genetics and go through rigorous quality control which guarantees that growers can consistently access top-notch auto-flowering cannabis seeds

Common Auto-flowering Strains and Their Average Height

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Purple Sour Diesel auto-flowering seeds are Sativa-dominant, providing a cerebral and energizing high. When it comes to growing conditions, this strain tends to thrive in warm climates and requires ample sunlight for optimal development. In terms of height,  it can exhibit a range from 1.5 to 2.5 feet, making it a versatile choice for growers with varying space considerations.

Blueberry auto-flowering seeds are indica-dominant and provide a relaxing body high along with sweet berry flavor. This autoflower plant thrives in both indoor and outdoor settings and reaches around 2 to 3 feet.

Northern Lights auto-flowering seeds are indica-dominant and have calming and soothing effects. This resilient strain is adaptable to various environments and is easy to grow. Northern Lights produces shorter plants that are 2 to 3.5 feet tall.

AK-47 Auto-flowering seeds are a balanced hybrid, providing an uplifting and mellow high. This autoflowering strain is tolerant of diverse climates, so they are suitable for both indoor and outdoor growth. Their height is usually around 2 to 3 feet.

White Widow auto-flowering feminized seeds are a balanced hybrid that delivers a euphoric and creative buzz. It is well-suited for indoor cultivation since it tolerates cooler temperatures. White Widow auto-flowering plants generally reach a moderate height, making them suitable for indoor setups with limited vertical space. Their average height typically ranges from 2 to 3 feet.

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