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How much weed does one plant yield

The question most asked by beginner growers is how many grams of cannabis per plant can be harvested? A great question, yet hard to answer in a simple way, but certainly not impossible.

All plants depend on light, nutrients and water to achieve their optimal growth and potential in terms of harvest. Cannabis plants can be grown indoors or outdoors using many different horticultural methods, which all have an impact on growth, not even taking into consideration the natural variations in yield between strains.

To answer the question “how much weed does one plant yield“, we will look at weed plants grown indoors under different light conditions to give you an understanding of how much weed an average weed plant can produce.

Factors that determine the harvest of a strain

Many factors influence the weed production of a cannabis plant. The most important ones are listed below:

  • The type of culture: indoors or outdoors
  • Lighting power
  • Available space to the plant
  • Growth time
  • Temperature and humidity
  • Type of seeds
  • Fertilisers used to feed the plant
  • The culture technique used: one-bud, scrog, trellising, etc.

Indoor cultivation

The number of plants doesn’t really count. It doesn’t matter how many plants per square metre you grow. The goal is for the entire available surface to be covered by plants, which will allow the flowers to occupy all of the available space and thus maximise the production of weed.

The number of plants per square metre will, however, have a significant influence on the growth time required.

You could decide to make 1 m2 of one-bud. In which case, you would need between 15 and 50 plants to cover one square metre, and in this scenario, the growth phase will last less than a week. Indeed, you can put your plants in the flowering period as soon as the first leaves appear. Or you could decide only to grow one plant in one square metre. For this, and if you want your plant to occupy all the available space, it will take a growth period of two to three months. However, it is advisable to choose a compromise between these two extremes.

For beginners, six plants per square metre allow a relatively short growth phase of 4 or 5 weeks. This also avoids having to manage 10 or 15 plants in a first session.

Here are some different scenarios to give you an idea of what you can hope to harvest.

Scenario 1 – Beginner using 600-watts

A beginner cultivator using a 600-watt HPS lamp in a 1 m2 box. Average quality equipment and basic fertilisers.

Let’s also imagine that this cultivator takes care of his plants carefully throughout the growing period.

Finally, let’s also suppose that this grower encountered some problems of too high temperatures or too low humidity.

This cultivator can expect a harvest of 200 to 350 grams per square metre.

Scenario 2 – Experienced cultivator using 600-watts

Imagine an experienced cultivator who knows some cultivation techniques such as trellising or scrog.

Under the same conditions as the first scenario. 600-watts in 1 m2, medium equipment, basic fertilisers. Everything goes well during cultivation, and the plants receive the care they need.

This cultivator can harvest between 300 and 500 grams per square metre.

Scenario 3 – Beginner cultivator in 40-watts

A beginner cultivator using a 400-watt lamp. High-end equipment with a lot of cutting-edge optimisations and advanced but poorly mastered cultivation techniques.

In such a scenario, it is quite likely that the grower will make beginner mistakes. And these errors will cost much more than the potential gains that these optimisations could have delivered.

The harvest could also be limited to 50 or 100 grams of dry grass per square metre if something goes wrong during the cultivation.

On the contrary, if all goes well, the grower can expect between 200 and 300 grams per square metre. But it will be necessary to avoid embarking on optimisations or advanced techniques.

Scenario 4 – An experienced cultivator using 1000-watts

Finally, imagine a very experienced cultivator with a 1000-watt lamp and a growing area of 1.5 to 2 square metres. Top-quality material, ideal climatic conditions and culture which goes as well as possible without any problem. The grower will use advanced cultivation techniques such as CO2 enrichment, hydroponics and automated climate management.

This last cultivator could reach a record harvest of more than 650 grams per square metre.

How many grams of cannabis per plant can you harvest?

As promised at the beginning of the article, here are some crop estimates per plant, based on different growing conditions.

These estimates are presented in the form of scenarios, as in the previous section

Scenario 1: 400-watts and 15 days of growth

Imagine a plant grown indoors with a 400-watt lamp and a growth phase of only 15 days. The cultivation space is 1 square metre, and the plants occupy all the available space during the flowering stage.

A short growing period shortens the total growing time. For a variety that flowers in 50 days, a growth of 15 days will allow harvesting in just 65 days or just over two months. The downside is that you will need many plants to fill a space of one square metre!

In this configuration, if the grower takes care of the plants properly and there are no major incidents during cultivation, a cannabis plant can produce between 15 and 30 grams of cannabis per plant.

Scenario 2: 400-watts and 40 days of growth

Let’s take an indoor plant again with a 400-watt lamp but now with a 40-day growth phase.

During these 40 days of growth, the plant will have had time to develop a very dense root and leaf network, especially if the weather conditions are good. Some varieties will quickly reach a metre in height in 40 days of growth.

The production of buds from a single plant will, therefore, be much higher than the previous scenario. You can expect between 40 and 80 grams of cannabis per plant if flowering takes place under optimal conditions.

Scenario 3: 600-watts and 30 days of growth indoors

Growing a plant with a 600-watt HPS lamp with a 30 day growing period

The 600 watts will simply give you explosive growth. Indeed, you can virtually see your plant growth with the naked eye between morning and evening.

You will have the opportunity to train your plant to give it the shape you want and to maximise the occupancy of the space. With this method, yields can reach up to 100 – 120 grams per plant.

Choose the right seeds and your growing method

There are enormous variations in terms of potential harvest per plant ranging from 500 grams and 3 pounds.

This is a complex topic and there are many other factors that can affect yields, such as hydroponics, which minimises the likelihood of errors and the type of seed used, which also has an impact on the amount of harvest. Some strains are much more high-yielding than others. Big Bud and Girl Scout Cookies, for example, are famous for their huge buds and generous yields.

Reading tip: check all our high yielding strain seeds

The average yield over a cannabis strain depends on various factors. But how much weed does one plant yield? Check it out!

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 ]]>