Jan 212014
 January 21, 2014

marijuana cannabis plant plants yield

How Much Does One Marijuana Plant Produce?

One of the most popular questions regarding marijuana is “How much can I expect to get?” or “How much usable marijuana will a single plant provide?” There are no simple answers to this question as each situation depends on a number of variables.

Many people take up growing weed and they have a variety of reasons for doing so. In every case, you want to get the most out of your crop. Whether you’re growing for medical reasons or you just want to make a little money on the side, the overall yield is a top priority for all growers. Here are some tips to get the most out of your garden.

Growing Indoors

Lights are of the utmost importance when you’re growing indoors. Experienced growers can produce about a gram of marijuana per watt of light (1 gram = 0,035 oz). So, a 400-watt HPS lamp can potentially translate to 400 grams or 14 oz of usable cannabis. Likewise, a grow room with 1200 watts of light will produce 1.2 kilograms or 42 oz of cannabis. Having the right equipment, adequate nutrient solutions, beneficial air quality, and other valuable factors is important for producing the highest yields. Making sure the plants have space to grow is also key. Beginners can expect to yield grass as follows:


  • An average of around 1.5 to 2.0 oz  (3.5 oz for advanced growers) with 200-watt CFL lamps in a grow cabinet that measures 3.5 x 1.5 x 6.5 ft.
  • An average of around 3.0 to 5.0 oz  (9.0 oz for advanced growers) with a 250-watt HPS lamp in a grow cabinet that measures 3.5 x 1.5 x 6.5 ft.
  • An average of around 4.5 to 9.0 oz (14 oz for advanced growers) with a 400-watt HPS lamp in a grow room that measures 3.5 x 3.5 x 7 ft.
  • An average of around 5.0 to 10 oz (21 for advanced growers) with a 600-watt HPS lamp in a grow room that measures 4 x 4 x 8 ft.
  • An average of around 250 to 500 grams (1000 for advanced growers) with a 1000-watt HPS lamp in a grow room that measures 5 x 5 x 8 ft.


  • An average of around 40 to 60 grams  (100 for advanced growers) with 200-watt CFL lamps in a grow cabinet that measures 1 x 0.5 x 2 m
  • An average of around 80 to 150 grams (250 for advanced growers) with a 250-watt HPS lamp in a grow cabinet that measures 1 x 0.5 x 2 m
  • An average of around 100 to 250 grams (400 for advanced growers) with a 400-watt HPS lamp in a grow room that measures 1 x 1 x 2.5 m,
  • An average of around 150 to 300 grams (600 for advanced growers) with a 600-watt HPS lamp in a grow room that measures 1.2 x 1.2 x 2.5 m.
  • An average of around 250 to 500 grams (1000 for advanced growers) with a 1000-watt HPS lamp in a grow room that measures 1.5 x 1.5 x 2.5 m.

Individual Plant Yield

Indoor growth doesn’t bring with it a lot of certainty in terms of yield per plant. If you have only four plants per lamp, then you’ll yield much more than you would with total of sixteen plants for every lamp. You should consider these things prior to choosing how many plants you want to grow:

  • If you’ve only got 4 plants, your crop will be ruined if even one gets a disease or dies
  • Vegetative growth lasts longer with only four plants. You should want to force flowering when the tips of the leaves are touching. If there are more plants, the leaves touch quicker.
  • Four plants are easier to manage than sixteen.
  • If someone catches you, you only have four plants to your name.

Either way, growing four plants using a 600-watt HPS lamp could produce about 150 grams or 5.0 oz per plant. Sixteen plants that are grown under a 600-watt HPS lamp could produce about 37.5 grams or 1.3 oz of marijuana per plant.

Growing Outdoors

Under perfect, outdoor conditions, you can expect yields to extend to 500 grams or 17.5 oz per plant. Space is a necessity (at least two meters) along with water, nutrients, and a dearth of pests and diseases. If you use containers, they should be at least 50 liters or 15 gallons in size. It’s a good idea to germinate the seeds early on to allow the plants time to grow large. It’s best to germinate indoors where you can manage the humidity and the temperature for the seedlings. Again, 500 grams (17.5 oz) per plant is possible if everything goes as planned.

Aside from an adequate amount of sun, water, and nutrient quality, the actual genetics of the plant play a very important role. Seeds are vital and you need to have some exceptional seeds at your disposal. You can look through our marijuana seed shop to find the a strain that’s right for you. It all starts with genetics….

Want to know more about growing marijuana? Get your free copy of ‘The Marijuana Grow Bible’ by Robert Bergman at this link here.

Source: ILoveGrowingMarijuana.Com


About Robert Bergman

Robert Bergman is a master marijuana grower. Robert Bergman is the author of 'Marijuana Plant Care' and 'The Marijuana Grow Bible'.
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  • Humboldt Billy

    I get around 24 oz per plant using light depravation “black box” method, a plant allowed to grow full season can produce around 80 oz, thats 5 lbs. this is not the norm, a lot of growers get much less using both of these methods. Indoors i get at least a gram a watt

    • http://www.ilovegrowingmarijuana.com/ Robert Bergman

      Those are some great results Billy :)

    • Russell

      I had 16 plants under 2-1000w HPS ights. My average yield was 8 oz/plant.

      • Humboldt Billy

        Good job!

        • Humboldt Billy

          At Lying!

      • Grass Huffer

        Good work russell, what size pots did you use? did you use a light mover? what strains did you grow?

      • Newbie

        you must veg the plants to a good size for that king of yield, bravo! how big were they before 12/12?

      • crow

        drip irrigation, drain and fill?

      • Trimmer Tim

        I doubt this

      • Bongstar420

        This is not possible with the methods most people employ. Also, these numbers are a little hard to gauge because you did not mention the variety of Cannabis. I’d imagine you did not harvest the dankest possible and you were likely running a sativa. I will be impressed if you broke 1g/watt-month in the flower room of +20THC top shelf, no fluff. Additionally, I would have to estimate your waste such as water, nutrients, and media thrown away as well as how much you paid for the materials in addition to a negative analysis for the presence of pesticides or heavy metals to fully determine whether you are a worthy grower…

        It should be noted that an 8oz plant would take up roughly .448 m^2 for a moderately high yielding variety. The average level of adequate illumination is approximately 50watts/ft^2.

      • kushman

        I with bongstar on this 1, this is not possible, i call bullshit on you

      • A

        How ? What size pots. And soil ?

    • perry

      We call it bud in Tn …who cares smoke that shit!!!!

  • Choom Gang


    • acidsex

      Yes LED yields would be nice.

    • https://twitter.com/Moirraines Moirrainefortruth

      You really should get a different picture – that person isn’t real and he isn’t kind.

  • So Mile High

    On our tours we have a section where people can learn about growing. The get to see plants up close in every stage of the process it’s really interesting. http://www.SoMileHigh.com

  • Poppa Homage

    Can we be grown up and call it like it is ” CANNABIS ” calling it weed,pot,marijuana or any other slang lessens this valuable plant. We owe it the decency to not call it names

    • Pan Piper

      good point!

    • rb

      Heck yes Poppa Homosexual

    • smokin stokan

      “Marijuana” to me is a very offensive term. It’s a Mexican slang term for a person (not a plant or flower) who smokes to much. Totally agree that we need to start being adults and strike the term from all legal vocabulary. It’s as absurd as calling alcohol “fire water” or “drunkard juice”

      • Mo Jo

        No. Marijuana is a proper SPANISH word which was conflated with Mary Jane arond 1894 but is from much older Mari (Love) Huana (Flower), or the FLOWER OF LOVE.

    • Propa Fromage

      For someone who blazes, Poppa Homage sure has a very large stick up his ass!

    • https://twitter.com/Moirraines Moirrainefortruth

      You’re not the only one who is tired of “marijuana” (which isn’t really a word, more of a slang) and the rest of the denigrating words used for a medicinal plant that heals…

      • Mo Jo

        So? Cannabis is from Cane-Bosen, because the Hindu’s thought it was a member of the bamboo family and they used the resin (bosen) for a variety of purposes. Cannabis is just slang like any other word. They also called it Bang from which we get the word Bong. Sativa can grow 20 to 40 feet tall and it’s cane hollowed out like bamboo to make bongs. It is called Pot because Queen Elizabeth’s many sons worked closely with Walter Raleigh to bring seeds from the New World to Britain where they were grown in the Tudor’s “Potager” Gardens. Every single word we use has a slang origin. It’s just that some slang seems more dignified than others, but in my opinion dignity is a made up concept.

    • THC Lover

      Poppa Homage… The name Cannabis was given to the plant by humans… Other names are just as good, besides, marijuana is also an official name of it. :)

  • painkills2

    In the future, cannabis seeds will be more valuable than bitcoins. :)

    • –Anonymous–

      I don’t know about that. Currently seed production is sort of done underground. People growing illegally in Canada and the U.K to produce legal seeds. With legal growing, seed production will skyrocket as soon as good seed producers set up in the States. With the Government out of the way I would expect seed prices to drop along with bud prices.

      • painkills2

        It sure would be nice to see prices come down, especially here in New Mexico (no matter who or what is responsible for it).

        But if you think about it, there seems to be an awful lot of mediocre strains around, so the best ones will become even more valuable. The companies who are known for continually selling quality seeds will do the best in this market. Keeping in mind that these seed companies will have underground connections that will be difficult for outsiders to make. (I don’t know about you, but I have found growers to be an unusually tight-lipped group.)

        And considering how volatile bitcoin prices can be (as with in any market), it is conceivable that the price of highly-prized seeds, on any given day, could be more valuable than whatever price bitcoin is listed for on that same day.

        (From someone who only reads Bloomberg for the articles…)

        • –Anonymous–

          But all it takes is one person buying said valuable seeds and reproducing as many seeds as they want. That’s why high priced seeds go down quickly and is replaced by another. Usually these “new” strains are nothing more than a renamed cheaper strain. Maybe a cross. I find the high price of seeds to be insane but when something is illegal I can’t really complain. I would also argue that one article from High Times can take a mediocre strain and jump the price up to outrageous levels. I know what you are saying and agree in the current market, but now that some legality to the industry is forth coming the high prices can’t be maintained without some clever marketing. Time will tell though.

          • painkills2

            I admit I don’t have a grower’s knowledge of cannabis seeds. Would you say that there is such a thing as the original seed for a strain? I mean, I’m beginning to get a little dizzy with this chicken-and-egg thinking. One of these days, growers/dispensaries will educate interested patients, one-on-one, with how their medicine is grown. Hopefully, for free. Until I actually see the whole process, I’m just talking out of my… well, you know.

            And I sure hope the cannabis industry can bring in some new talent for its marketing strategies. Come into the light, children, all are welcome, all are welcome…

          • –Anonymous–

            A strain origin would probably be present in a country where it grows naturally. I read an interesting article about how seed producers travel the world looking for strains in remote villages. I’m not expert on the subject but today we have many “base strains” such as NL that have been the back bone of many new ones.

          • painkills2


          • –Anonymous–

            Northern Lights.

          • dickiefickle

            in order to make the medicine(stone ) better , taste different , or for diff medicinal qualities two or more strains are bred together

        • dickiefickle

          growers tight lipped ? only the ones that dont want to be busted ….

      • https://twitter.com/Moirraines Moirrainefortruth

        Greed is the main component for anyone selling cannabis for ridiculous prices.

    • All4theJuice

      In the year 2000

  • Patsy Buvoltz

    This all is variable depending on the strains you grow.

  • null

    How many months is the vegetation state for these numbers?

  • Ca Rio

    How many money i can get with 2-3plant outdoors and wath is the cost

  • sneaky stoner 420

    so im getting 200000 pounds of that

    • sneaky stoner 420

      of money

  • Losie

    I have a renter who is growing marijuana plants in a 9 foot by 7 foot area in the basement. It is legal where we are. I am concerned about the amount of water it would take for this area of marijuana? I am paying the water and my bills have been considerably higher than normal.

  • Craig Scott

    Robert Bergman is a master Marijuana growers

  • Dimitar Yanev

    In how long does the plant produce this yield? In one harvest… one year… it’s lifespan?

  • NLSHIVA1998

    that is so not true about the yield part 1.2.

  • NLSHIVA1998

    2 pounds per light under 14 days veg min, depending if you veg the thing like a tree, it will never yield what he says.. Which depends on how much money you want to spend on bills vegging for months and could still never produce that . Good rule of thumb 2-2.5 pounds per 1000 watt with little veg at 4 months from a clone to harvest.

  • Mick Malkemus

    Bong Shankar is what an Indian friend of mine used to call it. I think this name is likely older than all the others. He said it with reverence, as if he were addressing the gods.