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The Ultimate Guide to Autoflower Space Optimization: How Many Autoflowers Per Square Foot

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Image: Efficient Autoflowering Cannabis Grow Space Grid with Measuring Tape. Article: 'Ultimate Guide to Autoflower Space Optimization: Plants per Square Foot

Autoflowering cannabis plants are a popular choice for both indoor and outdoor growers. They have a shorter life cycle and require less attention than traditional plants, making them ideal for those with limited space or experience. But how many autoflowers can you fit per square foot?

A general rule of thumb for determining how many autoflowering cannabis plants can fit per square foot without any training is around 4-6 plants per square foot. This will depend on the size of the plants at maturity and the specific growing method used. It’s important to note that this is just a general estimate, and actual yields can vary based on the light intensity, nutrition, temperature and humidity, and strain. It’s important to keep in mind that training the plants can greatly increase the number of plants per square foot and optimize growth and yields.

How Many Square Feet is My Grow Room?

To calculate how many square feet your grow room is, you will need to measure the length and width of the room in feet. Then, you can use the formula:

Square footage = length x width

For example, if your grow room is 10 feet long and 8 feet wide, the square footage would be:

Square footage = 10 x 8 = 80 square feet

how to calculate square feet

It is important to note that this calculation is for the floor space of your grow room. If you have a room with walls and a ceiling, you may also want to include them in your calculation.

To calculate the space of a room with walls and a ceiling, you can use the following formula:

Square footage = (length x width) x height

For example, if your grow room is 10 feet long, 8 feet wide, and 10 feet high, the square footage would be:

Square footage = (10 x 8) x 10 = 800 square feet

It’s important to remember that the amount of square footage you have will help you decide how many plants you can grow and what size of grow lights and other equipment you will need to provide enough coverage for your plants.


Genetics plays an important role in determining how many plants can fit per square foot. Different strains of cannabis have different growth patterns and sizes at maturity, which can affect the overall yield and how many plants can be grown per square foot.

Indica strains, for example, tend to be shorter and bushier compared to sativa strains, which grow taller and more narrow. These differences in growth patterns can affect how closely plants can be together, with indica strains allowing for closer spacing, therefore more plants per square foot, while sativa strains may require more space between plants.

Hybrid strains can have a combination of growth patterns. They can be shorter and bushier like Indicas or taller and more narrow like Sativas. It depends on the genetics of the specific hybrid.

Additionally, autoflowering strains, due to their shorter life cycle, tend to stay smaller in size, which means they can be spaced closer together than traditional cannabis plants, allowing for more plants per square foot.

It’s important to keep in mind that genetics can also affect the overall yield of a plant, with some strains having higher yields than others. So, even if you can fit more plants per square foot, the yield may not necessarily be higher. It’s recommended to research the specific strain you want to grow and its growth pattern, size, and yield before deciding how many plants you want to grow per square foot.

The Sea of Green Method

The Sea of Green (SOG) method is a popular technique for growing cannabis that involves planting multiple smaller plants closer together. This method allows growers to maximize yield per square foot. By using this method, you can fit 9-16 autoflowers per square foot.

The key to the SOG method is to keep the plants small and bushy. This is achieved by topping the plants early, which encourages the growth of multiple branches. Once the plants have reached a specific size, they are then spaced closely together. This allows the plants to grow vertically rather than horizontally, resulting in more buds per square foot.

The ScrOG Method

Another method for maximizing yield per square foot is the Screen of Green (ScrOG) method. This method involves training the plants to grow through a screen or mesh. The screen is placed above the plants, and as they grow, they are trained to grow through the holes in the screen. This allows the plants to grow vertically, making the most of the available space.

With the ScrOG method, you can fit 4-6 autoflowers per square foot. This method is more labor-intensive than the SOG method, but it can result in a higher yield.

Factors That Affect Yield

The number of autoflowers that can fit per square foot is not the only factor that affects yield. Other factors to consider include:

  • Light intensity: The more intense the light, the higher the yield.
  • Nutrients: Proper nutrition is essential for healthy growth and high yield.
  • Temperature and humidity: Keeping the temperature and humidity within the optimal range will promote healthy growth and high yield.
  • Strain: Different strains have different yields and growth patterns.


Autoflowering cannabis plants are a great choice for growers who want to maximize yield per square foot. By using the Sea of Green (SOG) or Screen of Green (ScrOG) method, you can fit 9-16 or 4-6 autoflowers per square foot, respectively. However, it’s important to remember that yield is affected by various factors, including light intensity, nutrients, temperature and humidity, and strain. By keeping these factors in mind, you can ensure that your autoflowers reach their full potential.

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