how much marijuana per plant

How much will an indoor cannabis plant yield?

Home Grower Question: How much does an indoor cannabis plant yield?

Answer: The answer is not easy, but it’s honest. Plant yields vary due to many factors including the size of plant, which is to say, how big you let your plant grow. The quality of the plant’s genetics and propensity for the genetic’s yield — be it a low, medium or heavy producing strain, also greatly influence yield.

Because indoor cannabis plant yields vary, there is no cut and dry answer to the question, “how much does an indoor cannabis plant yield?”

You see, it depends on whether you are growing small plants, medium sized plants, large plants, or extremely large plants. The size of your pot must be taken into consideration, and there can be a big difference in the size of your harvest (yield), depending on if you are growing in a grow tent or in a grow room with high ceilings.

Where and how you grow is a crucial factor to get to the bottom of your question, “how much does an indoor cannabis plant yield?” The strain you grow is also an influential factor. Additionally, you must consider how long you are growing your plant in the vegetative phase. People who grow cannabis plants with over 10 ounces are usually keeping their plants in the vegetative phase for more than 10 weeks. Do you have the time?

What about those one-size-fits-all answers online?

They often reference a yield algorithm based on things like how big your grow room is, what lights you are using, how many watts, and more. Not helpful. An answer like, “A grow room with 1200 watts can lead to a yield of 42 oz.” or “you can grow 1 lb. per plant,” not only sets false expectations, it confuses new cannabis gardeners who are trying to grow in grow tents with LEDs.

But that doesn’t mean you can’t figure an answer to this common question about plant yield indoors. There are a lot of moving parts in your gardening process that influence yield per plant. To get close to a perfect estimate, you’ll need to know if you are growing in a small tent, large tent, or in a grow room. If you are growing in a small grow tent, you may be growing small to medium size plants. You may have 6 short plants or 3 short to medium sized plants, 2 big plants, or you may have 1 “large as you can get it” plant.

Genetics, plant care, lighting, pot size, and your grow space all influence how much an indoor marijuana plant will yield.

Plant genetics greatly influences how much a plant can yield. You can grow a “heavy yielding” or “heavy producer” strain, average yielding strain, or low-yielding strain. For example, the size of cola buds on a Dream Queen strain are much bigger than the cola buds of a Girl Scout Cookies strain. If you are unsure of your seed or clone origin before growing, that is a big risk to take if growing for heavy yields is your goal.

Don’t forget “Plant Care.”

You can lessen your plants yield potential by not properly caring for your plant indoors. Plant care includes the quality organic nutrients and water it needs to survive and thrive. It may include plant training techniques like topping, pinching and supercopping, all to grow bigger plants. If you don’t practice proper plant care, you won’t get as much of a yield per plant.

Pot size matters!

Did you give your plant a 2, 3, 4 or 5 gallon pot, or a 10 gallon pot? The bigger the pot, the bigger the plant. Lighting is another key ingredient to increasing your plant yields. If you grow with a cheap LED Light, you’ll diminish the plant’s yield potential. You’ll want to grow with a high quality LED light to get the most amount of yield per plant indoors.

With all that said about indoor plant yields, home growers who grow marijuana plants indoors in grow tents may yield from 1 – 5 ounces per cannabis plant, with a sweet spot of 2 – 4 ounces per plant. Honestly it depends on the above mentioned gardening and genetic factors, but this gives you a realistic snapshot of your cannabis yield potential.

Lastly, if you have high ceilings in your grow room (or a emptied indoor pool), you are positioned to grow plants that may yield much more, like 6 – 16 ounces. There are 16 ounces in 1 pound. You could even pull 2 lbs. from a plant indoors if you really wanted, but it would take a significant amount of time in the vegetative phase and you’d need tall ceilings, and big pots. It is in the realm of possibilities! Our best recommendation to grow indoor plants indoors that weigh 2, 3, 4, 5, 6, 7, or 8 pounds is to grow in 100 lb. pots, and give yourself at least 4 – 6 months in the vegetative phase of plant growth.

Home growers who grow marijuana plants indoors in grow tents may yield from 1 – 5 ounces per cannabis plant, with a sweet spot of 2 – 4 ounces per plant.

How Many Plants per Light?

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How many plants per light? This is sometimes an issue for novice growers and it has a pretty simple solution. The amount of plants per light depends on the type of plants and how you grow them, apart from the space you have and the potency of the plants.

Planting seeds is not the same as planting clones, and autoflowering seeds aren’t the same as seasonal seeds; plants that have more yield on the tips of the branches aren’t the same as plants that have larger yields in the central calyx. In this article we’re going to talk about different kinds of plants and grows and how many plants you should use for each – planting too many can eventually ruin your entire grow.

Practically all bulbs and lights can illuminate the same amount of space, and your plants will adapt to that space and the power of the lights; if you plant four 3 month autoflowering strains with a 600w light, with a 250w light you’ll do the same; the difference is that with a 600w light you can get 400-500g and with a 250w light you can get 120-200g. The second lot will grow slower but you’ll still fit the same amount of plants under the lights.

How many plants per light when cloning:

The best thing you can do to get the best yield out of a squared meter with clones is to place as many as you can fit in 3L flowerpots and set them to flower straight away. This way, you can fit up to 36 of these small babies in a square meter, getting 12-15g per plant as they only grow buds on the main trunk – this makes for an almost even 500g which is the maximum you can get out of a 600w light. If you plant 9, you’ll never get even close to the yield that you would have gotten with 36 and the buds will also grow out much thinner. If you want to get more yield with less clones then you’ll need to grow in a SCRoG system that will increase the yield but also requires more caring to.

How many plants per light when planting seasonal seeds:

When you plant non-autoflowering seasonal seeds then you need to keep a few things in mind; does the strain you’re going to plant have most of its yield on the central cola like Critical+ or Cream Caramel, or do they produce more yield on the branches like Northern Lights or White Widow? Once you know that you can have a general idea of what to do – if they’re tall and you plant too little of them you’ll have extra space, but if they’re wide and you place too many they’ll grow upwards, much too tall, and they’ll end up being of terrible quality.

If you plant wide plants then you’ll need to place around 4 per square meter and top them a week before they begin flowering – you can find out what topping is by reading our article on how to prune your plants. With this set up, your plants will completely fill out your grow space. If you’re going to plant strains that have most of their yield on the central stem then you can plant 9 in a square meter – 16 max. If you plant 9 then you can allow them to grow properly without pruning, although if you plant 16 you’ll need to remove the lower branches so that practically all that’s left are the upper parts of the plant – this will cause heavier and bigger buds to grow.

How many plants per light when planting autoflowering seeds:

When growing autoflowering strains indoors, you can rest assured that they’ll get the perfect climate that they need and that they’ll grow as well as they can, depending on how you treat them. These plants don’t like too much water when they’re just starting out, and if you over-water them you’ll end up with dwarfed plants rather than normal plants. How big they grow really depends on you, so if you’ve never planted autoflowering strains then you should plant a few more than usual in case some end up dwarfed.

They are the perfect option for when you want a quick harvest as there are strains that take just two months to grow from germination until harvesting time; autoflowering plants have an amazing power, aroma and effect. There are two groups of autos; 2 month, and 3 month plants. 2 month plants should give about 40g per plant, so with about 9 you’ll be able to easily fill a square meter and get up to 400g per 600w light. 3 month autoflowering plants grow much bigger, however, so you should only plant 4 per 600w light. If everything goes well and you don’t over-water them or anything like that, then you should have an amazing harvest. If you’re planning on planting autoflowering seeds then you should go check out our article all about auto strains.

Now that you know how many plants you should place per light, it’s time to put it into practice! Many growers think that by using more plants they’ll get more yield, but honestly having too many plants can ruin your entire grow and cause you to get almost nothing from what could have been a productive endeavor.

Author: Javier Chinesta
Translation: Ciara Murphy

How Many Plants per Light? Find out how many plants you should place per grow light depending on the strain, method and kind of seed.