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How Many Cannabis Plants Should I Grow? (For the Biggest/Fastest Yields)

Should you grow just one cannabis plant or many to maximize your yields? What’s the best number of plants to grow considering your grow light and the size of your grow space?

What’s the best number of plants to grow?

There are a few different schools of thought when it comes to the best number of marijuana plants to grow in an indoor setup. I’ll walk you through the benefits of growing just one plant vs the benefits of growing many, and then give you some real-life examples with specific setups. That way you get the information you need to make the best decision for your garden

One or Many Cannabis Plants: Costs vs Benefits

Growing Just 1-2 Cannabis Plants at a Time

  • Easier – Fewer plants make it easy to pay attention to each individual plant and it’s often easier to reach all the plants.
  • Much Simpler – You won’t need to compromise as much between plants with different needs.
  • Less Time Daily – Spend less time on a daily basis caring for plants (making nutrient water, watering, training plants, etc).
  • May Be Only Legal Choice – Many growers live in an area with a limit on the number of plants they can grow (for example in Canada you are only allowed to grow 4 plants at a time, and each legal US state has different growing rules). These growers don’t have a lot of choices when it comes to how many plants to grow.
  • Less Variety – You’ll only be able to grow one or two strains, instead of many strains at once.
  • Fewer (or Smaller) Harvests – Yield is based on how well you fill the grow space with plants before they start flowering. With just one or two plants, it takes extra time for each plant to fully spread out in the vegetative stage so you achieve the best yields. This results in fewer harvests a year. Alternatively, if the grow space has empty spots during the flowering stage you’ll end up with smaller yields.

Should you grow just one or two plants at a time and let them get big?

It took 8 weeks in the vegetative stage to train the plant to grow this way. Yet it was a joy to focus on just one plant and get to form a relationship with it.

In the flowering stage, the plant rewarded the effort with buds that filled the space where the plant was trained

Growing Many Cannabis Plants at a Time

  • Faster Harvests – Especially in a large grow space, several plants can fill the space faster during the vegetative stage than just one or two plants. This allows the grower to switch to the flowering stage sooner.
  • Max Yield for the Time and Electricity – A shorter grow period results in extra harvests. If you are looking to get the biggest yield in the shortest amount of time (maximizing your yield for the electricity), this is an effective strategy.
  • More Variety – With a higher number of plants, you’ll have the ability to grow a greater variety of strains at the same time.
  • More Daily Care – You will usually spend more time on a daily basis tending your plants, and it’s often more difficult to reach the plants in the back.
  • Different Plants Have Different Needs – Each plant prefers slightly different levels of nutrients, light intensity, etc. The differences can be especially stark when growing many different strains at once.
  • More Difficult to Train – Training plants to grow wide and flat results in the best yields, but it can be more difficult to train multiple plants. Some plants grow much taller/faster than others, and you have work around all the other plants. To simplify things, some growers avoid any training when growing many plants at once.
  • May Be Illegal Where You Live – It may be against the law to grow a large number of plants even if growing is legal where you live.

Should you grow many plants so they fill your grow space faster?

It only took 6 weeks for those plants to completely fill up this grow space. Imagine how long it would have taken for one plant to grow this big!

No Matter How Many Plants You Grow…

  • Similar Yields Per Square Foot – Cannabis yields are based mostly on the size/shape of the canopy in relation to your grow light, not the number of plants. Filling the total surface area of plants under the light with bud sites is what matters, and it doesn’t really matter if you use one plant or many to fill the space before flipping to the flowering stage.

That means even if you can only grow a few plants at a time, you can still get the same yields in your grow space as someone who can grow more plants! It just might take a little bit longer in the vegetative stage.

It doesn’t matter whether this canopy was created by one plant or many. However you got here, your yields will be about the same as long as everything else is equal!

Growing Many Plants Shortens the Vegetative Stage But Doesn’t Necessarily Increase Yields

When it comes to getting the best yields as fast as possible, you will often have better luck growing several plants than just one or two. This is because it takes several plants less time to completely fill up a space than it would take one plant to fill up that same space.

However, time might not be the main concern. Many growers don’t mind an extra few weeks in the vegetative stage if it makes the growing process easier and more fun.

But in the end, the actual yields will be about the same as long as the space does get filled. Given the same total number of colas and size of plants, it won’t matter much if you have one plant or twenty as far as yields are concerned.

What’s the “Optimal” Number of Cannabis Plants?

If you can legally grow as many marijuana plants as you want and are willing to put in the extra time and effort to grow as many plants as necessary, what’s the best number of plants to grow?

Each plant should get plenty of direct light and at least a foot or two of space to itself

The optimum number of plants depends mostly the size of the area under the grow light. A plant generally should get at least a foot of space to itself to really be able to grow and spread out, and it’s often better to give plants a little more space, especially if you have powerful grow lights like HPS or LEDs!

Suggestions for Example Grow Spaces

2’x2′ Space – 1-4 Plants

2’x4′ Space – 1-6 Plants

3’x3′ Space – 1-6 Plants

4’x4′ Space – 2-9 Plants

These suggestions definitely aren’t set in stone, but they serve to give you general starting guidelines. It is possible to grow more plants in these spaces successfully, but with more plants, you will often start running into difficulty being able to reach the plants in the back and care for them properly. Sometimes it’s more of a pain than it’s worth.

These two plants fill this entire 4’x4′ space, but you could get the same amount of canopy coverage with many smaller plants. It’s up to you to decide how you want to fill your space

Keep in Mind! Your yields are limited by the size of your grow light, not the number of plants. Light is like food for your plants and has a direct correlation with yields. The more plants you grow, the less each individual plant will get as far as light. Think of your grow light like a pie, with each additional plant getting a smaller slice to eat every day.

It’s tempting to grow a lot of plants, but you don’t want to spread your light out too thin! If you grow too many plants you might get less than an ounce per plant, and your buds will be airy and light!

Your yields are ultimately limited by the size of your grow light, regardless of how many plants you grow.

All of the following grows took place in a 2’x4’x6′ tent and produced a comparable amount of weed

3 plants (5-gallon pots)

4 plants (3-gallon pots)

7 plants (2-gallon pots)

It can be hard deciding what number of plants to grow in your space, but ultimately the best thing you can do is to pick a number and dive right in to growing. I believe in listening to your gut. When in doubt, always start with more plants than you need so you have the option of ditching any plant that doesn’t germinate, grows poorly, or ends up being a male or hermie.

Always start with more plants than you need, just in case! But remember, you may have to throw some of them away…

Each grower has a different style, and as you get more experience, you’ll be able to dial in your grow to what’s best for you and your setup.

Many growers find it more relaxing and enjoyable to grow just a few plants (or even just one). On the other hand, growing many plants at a time produces more strains, more often. The right choice depends on you and your needs.

So unfortunately I can’t give you a “best” number to end all numbers, but I hope you now have a better idea of how many plants to grow in your space!

Beginner Shopping List (What You Need to Start Growing)

How Many Cannabis Plants Should I Grow? (For the Biggest/Fastest Yields) Should you grow just one cannabis plant or many to maximize your yields? What’s the best number of plants to grow

How Many Plants To Grow Per Square Meter?

“How many plants do I need in my garden?” It’s a question that might not seem obvious at first. However, the number of plants you keep in your space can make or break a garden. Too many and your grow can quickly become unmanageable. Too few and your yield will suffer. So, how many plants do you really need per square meter?

Important Aspects Of Your Growing Space

Factors like light, air circulation, humidity and temperature affect the health of your cannabis garden. The number of plants you put in your growing space will influence all of these variables. When you’re trying to determine how many plants to grow, you’ll need to take these elements into account.

Light – A Crucial Factor

When it comes to light source, bigger isn’t always better. High-powered HPS and MH lamps aren’t always ideal for a home grow. First, they can increase the temperature in your grow space to unbearable levels. They’re also expensive to operate. LED lights can address this issue. They’re expensive to buy, but cheaper to run. Additionally, they give off less heat. When determining how many lights you need in your garden, use 400-600W per square meter (about 10 square feet). Keep in mind that dividing this wattage between several lamps would be more effective than when using just one – a couple of light sources would provide better light coverage than a single bulb.

Fresh Air, Fresh Buds

The number of plants in your grow will also affect how much airflow you need. Without proper air movement, your plants can fall prey to disease. As a result, adding more plants to your grow will necessitate more fans. By placing rotating fans in the corners of your room, you’ll achieve proper air circulation and ensure that there are no spots of stale air. Aim the fans to blow gently across the top of your canopy as they rotate.

Easy-To-Grow Cannabis Strains

Ambient Conditions – Temperature And Humidity

When plants photosynthesize, they cause humidity levels to rise. Too much humidity in your garden can leave them exposed to a plethora of health problems. Plants also give off heat, which can cause the temperature of your room to rise to dangerous levels. As a result, if you pack too many plants into a small area, you’re asking for trouble. Proper airflow can help mitigate these problems. Additionally, you can use a dehumidifier to combat high humidity and air conditioning to correct the temperature in your garden. Always make sure the temperature is around 20-25°C (68-77°F) and that humidity levels don’t exceed 40-60%. For exact requirements, always check the recommendation of your seed bank.

Marijuana Feng Shui: How Many Plants Should You Keep?

There’s no general rule regarding how many plants to grow per square meter (about 10 square feet). Depending on what types of plant training techniques you use, it may be possible to maintain a successful grow with just a single plant. Methods like pruning, topping, low-stress training (LST), screen of green (ScrOG), sea of green (SOG) and FIMming can help you manage the space in your garden. We’ve organized these techniques from the fewest number of plants required per square meter to the most.

Green Screens – Not Just For Movies

Screen of Green (ScrOG) involves spreading the branches of one plant out when it’s still very young. You can either use a plastic net placed horizontally across your canopy or tie your branches down. This will cause new growth on the branches to turn upward and develop into their own colas. Using this technique, you can maintain a highly effective grow with just one plant per square meter (about 10 square feet).

Best ScrOG Strains

Topping – Two Is Better Than One

Topping is a technique that growers can use to minimize the number of plants in their garden. When a grower tops a plant, they cut off the very top of their main branch. This causes the plant to send the same amount of energy to the next highest branches. The end result? Instead of having one main cola, the plant will have two – a perfect scenario for when you have only one plant. However, be careful! If you top a plant too many times, you can end up causing too much stress for it, thereby decreasing your total yield.

FIMming – Topping’s Cousin

FIMming is a similar technique to topping. However, where topping involves a single clean cut to the apex of a branch, FIMming instead involves pinching the top of the plant and leaving about one-quarter of the plant matter behind. Like topping, this is a great way to manage space in your garden. Professionals use both topping and FIMming extensively in commercial grows because it lowers the total number of plants in their gardens to a single yet highly productive plant per square meter.

Pruning – Keep Your Plants In Check

Pruning is an essential technique for any cannabis grower to know. Pruning involves cutting away your plant’s lower branches. This helps the plant focus its energy on new growth. Pruning is an effective way that you can use to cut down on plant mass within your garden, allowing you to keep more plants in your garden by making more room for new growth.

Sea Of Green – Swimming In Plants

The Sea of Green (SOG) technique is one of the most popular forms of plant management in the legal pot industry. In contrast to SCRoGging, you’ll want to pack as many plants as possible into your garden. Using this technique, you can cram between four and sixteen plants into a single square meter (about 10 square feet). You don’t need to worry about pruning or any other plant management tactics when SOGging.

Best SOG Strains

Don’t Stress Out – Low-Stress Training Can Help

Low-stress training (LST) is a great technique for beginners. It’s relatively easy to perform and isn’t dangerous for your plants. LST involves bending or tying a plant’s branches down during its vegetative phase. Using this technique, you can fit between two and four plants in a single square meter (about 10 square feet). It’s also a good way to manage how many plants you need per square foot, and can help to keep your plants short if you’re growing indoors.

Final Countdown

As you can see, by using these methods, you can dial in your grow with as many or as few plants as you like. Remember, there’s no one rule about how many plants you should have per square meter in your grow. Experiment with the training techniques, keep the conditions right, and you’ll soon find what boosts the productivity of your setup the most.

Do you want to know how many plants can you have in your garden to get great yields? It all depends on a growing method you choose – ScrOG, LST, SOG, FIMming or something else? Get full info here.