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Stages of the marijuana plant growth cycle

January 17, 2020
picture of marijuana plant growth stages(Amy Phung/Leafly)
Cannabis plants, like all living things, go through a series of stages as they grow and mature. If you’re interested in cultivating cannabis, it’s especially important to understand the changes a plant undergoes during its life cycle, as each stage of growth requires different care.

Different stages call for different amounts of light, nutrients, and water. They also help us decide when to prune and train the plants. Determining a plant’s sex and overall health rely on stages of growth as well.

How long does it take to grow a marijuana plant?

Generally speaking, it takes anywhere from 14-32 weeks, or about 4-8 months, to grow a weed plant.

The biggest variability in how long a marijuana plant takes to grow will happen in the vegetative cycle—if you’re growing indoors, you can force it to flower after only a few weeks when it is small, or after several weeks when it is big. If you’re growing outdoors, you’re at the whim of the seasons and will have to wait until fall to harvest. The plant will develop buds in the last 8-11 weeks.

The life cycle of cannabis can be broken down into four primary stages from seed to harvest:

  • Germination (5-10 days)
  • Seedling (2-3 weeks)
  • Vegetative (3-16 weeks)
  • Flowering (8-11 weeks)

How to grow marijuana indoors: A beginner’s guide

Seed germination (5-10 days)

Light cycle: 18 hours of light

(Elysse Feigenblatt/Leafly)

The first stage of life for a cannabis plant begins with the seed. At this point, your cannabis plant is dormant, patiently waiting for water to bring it to life.

You can observe the quality of the seed by its color and texture. The seed should feel hard and dry, and be light- to dark-brown in color. An undeveloped seed is generally squishy and green or white in color and likely won’t germinate.


Cannabis Seeds 101: All You Need to Know and More

To begin growing from a seed, learn more about germination here. This stage can take anywhere between 5-10 days.

Once your seed has popped, it’s ready to be placed in its growing medium. The tap root will drive down while the stem of the seedling will grow upward. Two rounded cotyledon leaves will grow out from the stem as the plant unfolds from the protective casing of the seed. These initial leaves are responsible for taking in sunlight needed for the plant to become healthy and stable.

As the roots develop, you will begin to see the first iconic fan leaves grow, at which point your cannabis plant can be considered a seedling.           

Seedling stage (2-3 weeks)

Light cycle: 18 hours of light

(Elysse Feigenblatt/Leafly)

When your plant becomes a seedling, you’ll notice it developing more of the traditional cannabis leaves. As a sprout, the seed will initially produce leaves with only one ridged blade. Once new growth develops, the leaves will develop more blades (1, 3, 5, 7, etc.). A mature cannabis plant will have between 5-7 blades per leaf, but some plants may have more.


Quiz: How Well Do You Know Cannabis Plant Anatomy?

Cannabis plants are considered seedlings until they begin to develop leaves with the full number of blades on new fan leaves. A healthy seedling should be a vibrant green color. Be very careful to not overwater the plant in its seedling stage—its roots are so small, it doesn’t need much water to thrive.

At this stage, the plant is vulnerable to disease and mold. Keep its environment clean and monitor excess moisture.

Vegetative stage (3-16 weeks)

Light cycle: 18 hours of light

(Elysse Feigenblatt/Leafly)

The vegetative stage of cannabis is where the plant’s growth truly takes off. At this point, you’ve transplanted your plant into a larger pot, and the roots and foliage are developing rapidly. This is also the time to begin topping or training your plants.

Spacing between the nodes should represent the type of cannabis you are growing. Indica plants tend to be short and dense, while sativas grow lanky and more open in foliage.

Be mindful to increase your watering as the plant develops. When it’s young, your plant will need water close to the stalk, but as it grows the roots will also grow outward, so start watering further away from the stalk so the roots can stretch out and absorb water more efficiently.


How to tell if a cannabis plant needs watering

Vegetative plants appreciate healthy soil with nutrients. Feed them with a higher level of nitrogen at this stage.

Flowering stage (8-11 weeks)

Light cycle: 12 hours of light

(Elysse Feigenblatt/Leafly)

The flowering stage is the final stage of growth for a cannabis plant. Flowering occurs naturally when the plant receives less than 12 hours of light a day as the summer days shorten, or as the indoor light cycle is shortened. It is in this stage that resinous buds develop and your hard work will be realized.

If you need to determine the sex of your plants (to discard the males), they will start showing their sex organs a couple weeks into the flowering stage. It’s imperative to separate the males so they don’t pollenate the flowering females.


Differences in Growing Sativa, Indica and Hybrid Cannabis

There are a number of changes to consider once your plant goes from its vegetative stage to flowering:

  • Your plants shouldn’t be pruned after three weeks into the flowering stage, as it can upset the hormones of the plant.
  • Plants should be trellised so that buds will be supported as they develop.
  • Consider feeding plants with blooming nutrients.

What week of flowering do buds grow the most?

Buds typically grow the most toward the end of the flowering cycle, around week 6-7. You probably won’t notice much budding out at the beginning of flower, and it will slow down toward the end of the cycle, when buds become fully formed.

This post was originally published on July 18, 2017. It was most recently updated on January 17, 2020.

Once the buds have reached full maturation, it’s time to harvest.

Trevor Hennings's Bio Image

Trevor Hennings

Trevor is a freelance writer and photographer. He has spent years in California working in the cannabis industry.

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  • Anna Go

    What an awesome article!

  • Para Salin

    Seedling stage? I am so very tired of hearing about the wet paper towel method as the one and only way to make the magic of germination happen!
    There must be dozens of methods.
    Some old-school soil growers wish to protect the delicate embryonic tap root from light and the pressures of being handled. Their very successful method is to carefully place the seed – blunt side down / pointed side up – under 1/2″ of finely sifted potting soil. Give it light, warmth and moisture. And there she is. That way you only have to transplant once, to the full sized grow container.
    But, whatever works for you is good. Just so long as you grow your own. That’s the key, my brothers and sisters.

    • Trevor Hennings

      You are right, there are tons of ways to germinate! Never said this is the only way. Plants of all types have seedling stages before they find themselves growing their adult foliage. I believe many would germinate by placing in soil if seeds were not as costly. Due to the cost I think growers have become hyper aware of their seeds and the progress they are making. The Paper towel method allows you to control the exposure to moisture while then being able to remove the exposed tap root from excessive moisture.

      You are right that there are many methods and that it is important to grow your own.


    • Adama Murphy

      Back 2 the basics bro that’s what’s working 4 me..

    • David Graves

      I have found it better to transplant into 1 gallon containers when first put into pots (of whatever you prefer) then transplant from the 1 gallon to 7 gallon containers. I use cloth, just works better for me. This will promote early root progress in the younger stage. Roots not stressed trying to reach water in the early stage. out It works for me. You will hear a million different ways but this has seemed to work for me. Experiment with different ways and find what fits for you? I am not a millionair mega grower just small enough for me and to sell for my learning process. Thanks hope we all can help?

  • metronome

    I have a 12 W tao tronics led grow lamp. I’m getting ready to start germinating my seeds. How close/far should the light be from the germination bed?

    • Sander Trump

      6″ is the standard distance for the seedling stage test the distance by holding out your hand to a distance below the light that doesn’t get uncomfortably hot

      • metronome

        thanks for the info

        • Mark Wojciechowski

          Careful them lamps mixed with a room full a hot chilli farts can be enough heat to put a horse down. lol

  • If they are growing outside, do they need to be put in 12 hours of complete darkness in the flowering stage, or is keeping them in the shade for part of the day good enough?

    • Chuck Jones

      Complete uninterrupted darkness.

    • Gerald Dixon John Cummings

      I cover them to trick the plants…either with a sack or bags or by putting them in a dark shed…in fact, it’s a rainy day, so they’re in the shed right now in full bud.

  • Okiha Avhengig

    What do you mean by 13-24 hours. Do you guys mean 13 hours with light and 24 hours dark? 😀

    • Michael David Hiltner

      Simple: More than 12 hours of light is required for the Growth stage. The plant will consider to enter into the Bloom stage once hours of light drop below 12 hours of light, increasing hours of darkness beyond 12 hours. The plant is thinking it is passing…

      Will give you a better understanding to this cycle.

    • David Graves

      Germination stage 24 hours lights keep warm likes in the low 80’s
      Seedling stage 18/6 (light/dark) I do 24/0. Works for me, many will argue and this is fine? Temperature in the low to mid 70’s.
      Flower/bud stage 12/12 (light/dark) I have found that high 60’s work best for me.
      Everyone has a different views on everything, test and pick your best method.
      Different plants required different temperatures. study the plant you are growing.
      These are basic rules, different plants react differently. This is why personal clones off the same plant will work good for experimenting. They are the same plant so you can see the different lights and lighting/fert/dirt will react, Good clones will cut up to a 4 weeks off of your growing times. Read Read Read. Nobody else will suffer if you take bad information and your plants suffer. I hope this helps?

  • Brian Swyers

    What are you guys doing for water when your tap is HORRIBLE

  • Tony Mathias

    My wife has been growing outdoors since March after starting the plants indoors now she has trees ready for harvest However she has he plants getting many seeds in the buds She is afraid that these will hurt future crops or will pollinate a few new plants she has and is thinking of uprooting the plants and tossing them She got rid of one that produced only flower buds Any advice on future plants being compromised ? She is at the point of harvest now and is worried Thx Tony

    • David Graves

      Keep male plants away, far far away. Here in Oklahoma they say a 3 mile radius because of our windy days we have 35 MPH winds are common.

  • Johhny Bigood

    Thats all that was available in the 70’s, man. Just take the seeds out before you light up, otherwise you will have holes in your clothes!