How Many Seeds Do You Need to Grow Weed? (A Quick Guide to Get You Started)

Macro detail of hand holding marijuana seeds isolated over black background - cannabis growing concept

Growing your own weed might seem like a daunting task, but with a bit of knowledge and the right approach, you can cultivate your very own cannabis plants with ease. 

One of the first questions you might have is: how many seeds do I need to grow weed? Understanding the basics of germination, as well as success rates and methods, will help you determine the right number for your individual project.

You typically only need one seed per plant. However, not every seed will germinate successfully. To account for this, it’s wise to have a few extra seeds on hand. It’s also worth considering factors such as space and accessibility, as these will influence how many plants you can grow effectively.

By selecting the right amount of seeds and accounting for variability, you’ll be well on your way to a successful cannabis-growing experience. Just make sure you don’t store your marijuana seeds for too long.

Determining the Number of Seeds

Consider Plant Size

When deciding how many seeds you need to grow weed, consider the size of the marijuana plants you want to cultivate. Larger plants typically require more space and resources, while smaller plants can be grown more closely together. This directly impacts the number of seeds you’ll need to start with, so plan accordingly.

Target Yield

Think about your target yield – how much weed you want to produce. The number of marijuana plants you aim to grow directly determines the number of seeds to plant. For instance, if you’re aiming to grow 100 plants, you’ll need at least 120 seeds or more to account for any losses during germination or early growth stages.

Germination Rate

Not all seeds will successfully germinate, so it’s essential to factor in the germination rate. Look into the type of cannabis seeds you’re planning to use, as their germination rates can vary. If the germination rate is 90%, for example, then planting 100 seeds would result in approximately 90 plants. Adjust the number of seeds accordingly to reach your desired number of plants.

Indoors vs. Outdoors

Consider whether you plan to grow your weed indoors or outdoors, as this can significantly impact the number of seeds required. Indoor growing typically allows for more precise environmental control and may yield a higher success rate. On the other hand, outdoor growing allows for larger plants and potentially greater yields, but factors such as climate, pests, and other variables can affect the number of seeds needed.

How Many Marijuana Seeds Per Pot?

You should plant just one seed per pot when growing marijuana. Cannabis plants are annuals, meaning they grow, bloom, and are ready for harvest within a short time span of two to three months. By sticking to the one seed per pot rule, you can ensure that each plant has ample space and resources to thrive, ultimately leading to the best possible yield for your efforts.

Pot Size and Space Considerations

It’s a good idea to use smaller pots to limit the plant’s size and control the vegetative growth stage. However, if you have more room, opting for larger pots or a large container can give your plants more space to flourish. For instance, many growers prefer a 3-gallon pot for grow tents.

The space you’ll need for each plant could be from one to three square feet. This estimation depends on several factors, such as your lighting setup, ventilation system, and the cannabis strain you’re growing.

Keep in mind that larger pots can handle larger plants, but they also require more space in your grow area.

Seeds differ in siz so apply a simple rule for planting multiple seeds: one large seed, two medium-sized seeds, or three small seeds per hole. This rule ensures proper germination and growth for your cannabis plants.

Pros and Cons of Single vs. Multiple Seeds Per Pot

Here is an overview of the advantages and disadvantages of both approaches.

Single Seed Per Pot


  • Space: Planting one seed per pot gives each plant enough space to grow, ensuring it gets nutrients and light.
  • Health monitoring: It’s easier to keep an eye on your plant’s health when there’s only one seed in the pot.
  • Less root competition: Planting one seed per pot prevents root systems from competing with each other for nutrients and space.


  • Less density: If you’re aiming for a fuller pot or a specific number of plants, using just one seed per pot might not yield the desired results.
  • Lower germination success: If a single seed doesn’t germinate, you’ll need to start again with a new seed.

Multiple Seeds Per Pot


  • Higher germination success: Planting multiple seeds increases the chances that at least one will germinate.
  • Fuller pots: More seeds per pot can result in a denser and more lush appearance.
  • Cheaper: You will need to buy fewer pots and less soil.


  • Root competition: When multiple plants grow in the same pot, their roots will compete for nutrients and space, which can affect their overall health.
  • Disease spread: If one plant becomes diseased, it can quickly spread to other plants in the same pot.
  • Accidental pollination: With both male and female plants in the same pot, there’s a higher risk of accidental pollination.

Seed Types and Sources

When it comes to growing weed, selecting the right type of seed is crucial to ensure you achieve the best results possible. This section will discuss the various seed types available and where you can source them.

Regular Seeds

Regular seeds consist of both male and female plants, which means you will need to carefully monitor their growth to identify and remove male plants. These seeds are ideal for experienced growers who might want to experiment with crossbreeding to create new strains. Remember, you’ll generally need one cannabis seed per plant, so make sure to have extras in case some seeds don’t germinate.

Feminized Seeds

Feminized seeds are specially bred to produce only female plants, which ensures a higher yield without having to remove any males. This makes them perfect for beginners or those looking to maximize their harvest. Keep in mind, however, that feminized seeds can be more expensive than regular seeds.

Autoflower Seeds

Autoflower seeds are engineered to automatically transition from the vegetative growth to the flowering stage, without any input from the grower. This means they have a shorter growing cycle and are less dependent on light schedules. Autoflower seeds can be a great choice for novice growers or those with limited space and resources.

Online Seed Banks

When it comes to sourcing your marijuana seeds, online seed banks are a popular option. They offer a wide variety of seeds, including regular, feminized, and autoflowering varieties.

Online seed banks make it easy to find the perfect strain for your specific needs, and many ship discreetly to ensure your privacy. Just be sure to check the legality of purchasing and shipping seeds to your location before placing an order.

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