Many new growers wonder, “How much marijuana can one plant produce?” or “How much will a 600-watt HPS yield?” Unfortunately, there are no simple answers to these questions. Every grow is different and has different variables.
Whatever your reasons for growing are, you care about the yield. You want to know what to expect, and that’s reasonable. I can’t predict your experience, but I can give some reasonable numbers to strive for.
This article will discuss everything there is to know about marijuana yields. I’ve added some common questions at the bottom, but if you have more, place them in the comments below this article.
On marijuana yield per plant
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How much marijuana can you yield 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 grow light can potentially translate to 400 grams or 14 oz of dried, usable cannabis.
Likewise, a grow room with 1200 watts of light can yield 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 possible. Making sure the plants have space to grow is also key.
Although soil growing can potentially lower your yield, it also is easier to grow. This is because it not only creates a buffer for error, but it also holds nutrients within the soil.
“Using your indoor space more efficiently can give you twice as much growing area.”
When growing in soil, there is room to make mistakes with pH and TDS and pay for it in yield. In terms of numbers, expect a maximum of 1 gram per watt. That means a 600 watt lamp can produce 600 grams of marijuana or 21 ounces.
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Do hydroponics yield more?
Growing hydroponically yields up to 20% more, as long as you do not make any mistakes. With hydroponic growing, there is no room for errors.
You must be very careful about the TDS and pH levels because the roots are directly in water (and not soil) and incorrect levels can immediately affect the plants.
There are rarely small mistakes while growing hydroponically. Even the most minor error can ruin your yield. However, those who do it correctly will be rewarded.
You can expect up to 1.2 gram per watt, which means a 600watt HPS lamp can give you 720 grams of marijuana or over 25 ounces.
The pictures below show that hydro plants and their roots grow faster than soil plants
Start with high-yielding strains
Ideal circumstances are very important when trying to maximize your crop. But there’s no fault in helping yourself a bit by getting decently yielding genes. These strains fall under the category extreme yielders:
One of the most popular marijuana strains in the U.S., it’s your ideal start for a relaxing and invigorating day that later eases you into an easy euphoria.
- 20% Indica 80% Sativa hybrid
- High THC levels up to 21%
- Consistent heavy yields
- Easy going high for everyday use
- Feminized seeds for guaranteed bud
The name says it all. This strain grows huge buds which in turn yields great amounts of dry herb.
- 60% Indica 40% Sativa hybrid
- Feminized seeds for guaranteed bud
- Known for its easy to grow high yield
GSC is a very popular strain and nothing to sneeze at. This Extreme version of the strain yields huge flowers.
Girl Scout Cookies
- 80% Indica 20% Sativa
- High THC levels up to 21%
- Big yields for indoor and outdoor growers
Average marijuana plant yield outdoors
Under perfect conditions, you can expect yields to extend to 500 grams or 17.5 oz of marijuana 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. Browse my seed selection to find the strain that’s right for you. It all starts with genetics….
How to calculate marijuana yield
Want to predict your field before you grow? It doesn’t have to be a guessing game.
How much weed does one plant produce?
Try using a cannabis plant yield calculator. This calculator by Yield O Rama lets you select your type of light, the light intensity (lumen), your level of growing experience, and your growing medium.
Annual target & consumption projection
Days spent growing crops
Greater than 365: you will not meet your annual target (readjust your target settings or growing scenario).
Exactly 365: you will meet your annual target, growing continuous back-to-back crops for the entire year
Less than 365: you will meet your annual target, growing intermittently with some free time between crops.
When using the yield calculator, keep in mind that an HPS grow light produces around 150 lumens per watt. For the exact amount of lumen that your bulb produces, check with the manufacturer.
There are some limitations:
You cannot adjust it for the strain, and it’s only for indoor grows, but it is still quite handy. Check out the cannabis yield calculator here.
You can also measure your yield after you harvest but, keep in mind…
Wet and dry weed does not weigh the same
Drying your weed slowly (10 to 14 days) in a climate-controlled dark and dry place with a temperature of around 64 degrees will get you more weed in weight.
You will get about 20 % to 25 % out of your wet weed after drying, depending on the strain, the density of the buds and the way of drying. Only weigh the wet buds and not the whole plant.
Here’s an example.
Out of a well-cultivated Sativa you will get approximately 20% -22% dry weed and from an Indica about 22% -25%.
So out of one-pound wet Amnesia Haze you will get approximately 7.4 ounces and if you dry one pound of White Widow you’ll get about 8.4 ounces. At a street price of $ 7 (Oregon) or $12 (Texas) this is a very good profit.
On the other hand:
You will end up with approximately 12.5% if you weigh the entire plant, including stems and leaves, while it’s wet.
Buy High Yielding Seeds
- Bred to produce a large crop of marijuana
- Maximize the crop and meet legal limit
- Choose from several high-quality strains
Grow fewer cannabis plants to yield more marijuana
Indoor growing doesn’t bring 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 a total of sixteen plants for every lamp.
Before deciding how many plants to grow
Consider these facts:
- If you’ve only got 4 plants, your marijuana plant yield will be 25% less if 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
Think about this:
Grow sixteen plants under a 600-watt HPS lamp and produce about 37.5 grams or 1.3 oz of marijuana per plant.
Grow four plants using a 600-watt HPS lamp and yield about 150 grams or 5.0 oz per plant.
But grow one huge plant per 600-watt HPS, and you could produce a pound of marijuana per plant!
Yield more with Screen Of Green
The Screen of Green (SCROG) technique is an excellent way to increase your yield. The idea is to top your plants and place a screen at 15 inches above your plants.
Be sure to check out aPotforPot for a one-stop solution for a small grow!
When a branch grows 4 inches through the filter, tie it to the screen horizontally. Continue attaching the branches until you get a nice ‘blanket’ of tops.
Now, three reasons why growing with a screen of green technique increases your yield:
1. No wasted light
Any light that hits the floor or walls is wasted energy. With the SCROG method, you create a thick ‘blanket of leaves’ out of your plant that prevents light from being wasted, and instead forces it to be absorbed by the leaves.
2. All plants are the same height
When every plant is the same height, each will receive the maximum amount of light. With this method, there are no plants or branches in the shade, and you can place the lamp as low as possible, as long as temperatures don’t exceed 77 Fahrenheit.
3. No fluffy or soft buds
Because you prune the bottom branches that don’t grow through the screen, the plant doesn’t waste any energy on developing the small, soft buds at the base of your plant. (FYI, they never ripen.) Your plants also don’t waste energy on leaves and branches it doesn’t need. All of its energy goes to the top colas!
Here is a photo guide on how to SCROG:
I’ve used the screen of green method for many grows, and I’ve always been satisfied with the results. If you use it, your yield can increase by 10 to 20%.
Lights make the difference for indoor grows
Does a 1000-watt HPS yield more than a 600-watt HPS?
Well, not necessarily. While a 1000-watt HPS bulb produces much more light than a 600-watt bulb, a plant cannot convert all that light into energy. It will need more CO2.
There is around 350-400 ppm of CO2 in the air. Indoor marijuana plants will use this CO2, combined with energy from the light to create sugars.
If you grow in a closed grow room without an air inlet, the plants will use half of this CO2 within an hour and then slow down sugar production because CO2 levels are dangerously low.
This is why you must continuously ventilate your grow room with fresh, CO2 rich air from outside.
With 350 to 400 ppm of CO2 in the air, your marijuana plants cannot create more sugars than the light from a 600-watt HPS bulb produces.
So your yield will not be higher if you use a 1000 watt HPS lamp under normal circumstances.
On the other hand, if you increase the CO2 levels, your plants will need more light, and in that case, a 1000-watt bulb can almost double your yield.
It’s a large investment to buy the right equipment, but a 1000 watt grow light is worth it in terms of yield.
Want to learn more about CO2 and yield? Here is an interesting article about CO2 and tomato plants.
Average indoor yield with CFL & HPS
Keeping the impact of CO2 in mind, there are some numbers that you can expect when growing with CFL and HPS lighting:
1.5 to 2.0 oz average (3.5 oz for advanced growers) with 200-watt CFL lamps in a grow cabinet measuring 3.5 x 1.5 x 6.5 ft.
3.0 to 5.0 oz average (9.0 oz for advanced growers) with a 250-watt HPS lamp in a grow cabinet measuring 3.5 x 1.5 x 6.5 ft.
4.5 to 9.0 oz average (14 oz for advanced growers) with a 400-watt HPS lamp in a 3.5 x 3.5 x 7 ft. grow room
5.0 to 10 oz average (21 for advanced growers) with a 600-watt HPS lamp in a 4 x 4 x 8 ft. grow room
9.0 to 18 oz average (36 for advanced growers) with a 1000-watt HPS lamp in a 5 x 5 x 8 ft grow room
40 to 60 grams average (100 for advanced growers) with 200-watt CFL lamps in a grow cabinet measuring 1 x 0.5 x 2 m
80 to 150 grams average (250 for advanced growers) with a 250-watt HPS lamp in a grow cabinet measuring 1 x 0.5 x 2 m
100 to 250 grams average (400 for advanced growers) with a 400-watt HPS lamp in a 1 x 1 x 2.5 m. grow room
150 to 300 grams average (600 for advanced growers) with a 600-watt HPS lamp in a 1.2 x 1.2 x 2.5 m. grow room
250 to 500 grams average (1000 for advanced growers) with a 1000-watt HPS lamp in a 1.5 x 1.5 x 2.5 m. grow room
LED grow yield
There has been much said about LED lights, with many manufacturers claiming super high yields, but I haven’t seen them yet.
I’ve tried a 300-watt LED grow two years ago and generated less than half of what I usually produce. Many of my friends also haven’t received desired results.
An interesting fact is that commercial tomato growers haven’t switched to LED. For me, that’s a sign that they’re no better or more economical than HPS grow lights. With LED, the light intensity isn’t as strong as with HPS lights. Instead, the spectrum is more important.
So, I can’t tell you how much you will yield with a LED grow light. If anybody has some results, please share them in the comments.
I can confirm that LED lights produce a lot less heat compared to HPS lights. This will cause the plant to evaporate less water, changing the water and nutrient requirements for growers.
Time your harvest right so you can maximize your yields with my free mini Harvesting Guide.
- Time your harvest for Perfect Taste
- Get THC levels for a Perfect High
- Don’t waste any Precious Bud
Save money by growing marijuana
A store-bought marijuana plant will cost around $10 to $15. It will be a clone of around 5 inches tall, and they’re only available in the states that have legalized marijuana.
High-quality marijuana seeds cost between $8 and $15. They’re available all over the internet and of course in
But these figures do not cover the cost of producing weed. You need to buy equipment, nutrients and keep an eye on the electricity and water costs.
Below are some estimates, but read my article on costs and revenues for more details.
Growing 5 marijuana plants in a 2×2 foot grow tent with 2×100 watt CFL will cost you around $1000 per year and yield 0.25 pound of marijuana per harvest.
With 4 harvests per year, each marijuana plant costs about $50.
Growing 5 marijuana plants in a 4x4foot grow tent with a 600 watt HPS light will cost you around $2000 per year and produce 1 pound of marijuana per harvest. With 4 harvests per year, each marijuana plant will cost around $100.
Equipment like filters, timers, and exhaust fans are very expensive. The price difference between a setup for 2 or 4 lights is only 20% higher, but the yield doubles.
Again, here you can learn more about the costs and benefits of growing.
You could be saving money, especially if you yield a pound per plant!
What does a 1 pound plant look like?
If you want to grow a one-pound marijuana plant, grow a single plant.
You need a 4 x 4 foot grow tent or other similar-sized space, and a 600-watt HPS grow light.
Under ideal circumstances, a 600 watt light can produce well over a pound of cannabis. If you limit
Growing a one-pounder is a fun project, but there are some downsides. You need to veg the plant for very long until the entire floor is covered with leaves, so no light goes to waste.
Plus, if your plant gets sick or anything, you don’t have replacements. But it can be done!
Want to feature your 1-pounder indoor plant on our blog? Send me a picture!
Whether you are growing indoors or out, you can effectively plan for how much weed you’ll yield. In some cases, you can even grow a pound per plant.
It’s all about planning your grow setup and using the right grow techniques. You can predict your yield with a calculator or wait and weigh it after the harvest.
However you decide to grow, you’re likely to save money over buying it at a dispensary.
So, how much does Gold Leaf yield?
Gold Leaf is my very own, proudly bred, strain, and I must say; it is a very decent yielder!
As you now know, topnotch-conditions should apply but I’ve managed to cut about a pound of the plant grown indoors and it has even treated me to almost 21oz when I had it growing outside!
Buy Gold Leaf Seeds
- 60% Indica 40% Sativa
- High THC levels up to 21%
- Consistently grows high yields
FAQ about marijuana yields
Yes, there are other techniques that can increase optimal yield. Read this article to learn more.
You can try a variety of plant training techniques such as scrogging as well some other tips mentioned in this article.
Your final yield depends on a variety of factors; too many to develop a reliable equation. The estimates in my article are the best-case scenarios for the average or beginner grower.
Inspired to grow your own? Read from some comments from these happy customers and hopefully see you soon!