How to Grow Marijuana

Growth Period of Indica Marijuana Plant

Growth Period of Indica Marijuana Plant

The growth of your Indica marijuana plant is influenced by the light they receive either planting indoors or outdoors. When your marijuana plants receive uninterrupted darkness indoors, the plant will enter the flowering stage. By this stage, your plant will stop growing and will concentrate their energy into reproduction by producing flowers (buds). When planted outdoors, flowering will normally happen when the days get shorter around the end of summer. Indoors, flowering will begin when lights are switched off 10 to 12 hours of darkness every day.

The flowering period of almost all marijuana strains will last about 7-9 weeks. Some sativas however, require even longer periods for their buds to mature.

What happens during flowering and at what exact time can somewhat vary depending on the particular strain you are growing. Let us look at the flowering phases of cannabis week by week.

Flowering Weeks of 1, 2 and 3 for an Indica Marijuana Plant

Cannabis won’t just stop growing and then go into flowering right away. When the flowering period starts, it isn’t an abrupt change in your plants’ growth. In these first weeks of flowering, many cannabis strains may indeed undergo a considerable growth stretch. This is important to know when it comes to feeding your plants properly, but also if you want to give them sufficient space to grow. It is very important to note that before any flowering to begin, proper nutrition of the plant has already been undertaken.


The first week of flowering is also described as the transition and stretch stage of the growth of the plant. During this stage, your plant will grow rapidly in preparation for the possible change in climatic conditions and in anticipation of carrying heavy loads during flowering.

Some strains can almost double in height during this time because of the fast growth that your plant is undergoing.

While your plant is putting in quite some overtime to gain size and height, she will grow a number of new leaves mostly at the top of the main colas. Your cannabis plant is busy growing “green stuff,” like leaves and stems so she can become stronger and sturdier.

Important things to know in this early stage of flowering:

  • Your plant has officially entered the flowering phase, she will now have an increased need for growing nutrients;
  • You should not abruptly change your nutrient schedule and use flowering nutrients from one day to the next;
  • It is usually recommended that you continue to give growing nutrients for at least one more week once flowering starts;
  • With the stretching of cannabis in early flowering, you may possibly want to think about training techniques such as low-stress training (LST).This is where you bend the stems down and away from the center of the plant so you can get an even canopy for a more efficient use of your to grow This can help you obtain much better yields later on.


In week 2 of flowering, you may spot the first white pistils growing on your female cannabis plants. These fine and wispy white hairs will develop at those locations where the big fan leaves meet the main stem. It is these fine hairs that will later become buds.

If your cannabis plant happens to be a male, it won’t grow these “hairs,” but will instead grow small pollen sacs. Should you grow regular, non-feminized plants where you don’t know their gender now is the time when you should determine the gender of your plants so you can separate the males from the females. Take note: the males won’t grow buds and will also pollinate your females, causing them to grow seeds. This is something you do not want to happen.

To properly feed your plants once they start to flower and to initiate the first signs of growing buds, you should check your nutrient manufacturer’s schedule. It is normally around this time at week 2 where you will have to increase flowering nutrients to help your plants reach their maximum yield potential. In this stage fertilizers rich in nitrogen is highly recommended.


Your cannabis plants have still not entirely stopped growing and will now be about 50% bigger than what they were just three weeks earlier. Although still stretching a bit, the stretch will now gradually slow down and soon come to a complete halt.

At the locations on the plant where you previously saw some hairs, you can now see the first signs of real buds developing. There still won’t be many resin glands and trichomes on your plants, which means that the smell won’t be too pungent at this stage.

This phase of flowering where your plant is starting to spend increasingly more energy on growing flowers is particularly critical. Make sure that the nutrients you give are appropriate and check the labels for the recommended dosages.

As your plants become pickier, you should check for potential deficiencies that could manifest in various ways, such as the presence of discolored or yellowing of leaves and loss of leaves entirely. At the same time, you should also check your plants for signs of possible overfeeding (“nutrient burn”) that could show up around this time as well. The nutrient burn will usually show in the tips of the leaves becoming discolored. If this happens, you need to cut down on feeding.


At week 4 of the flowering stage, your cannabis plants will likely have stopped growing altogether and are now spending all their energy on growing buds. There will still be white hairs sticking out from the buds, but the buds themselves will become bigger and fatter with each day. With more and larger buds growing, your plants will now produce more trichomes, making the odor a lot more noticeable at this stage.

Since your cannabis plant will have stopped growing, you won’t have to pay attention to training your plants any longer. Where you bent down branches before, now you may possibly consider holding them up should they require structural support.


In week 5 of flowering, you can observe the buds all over your plant becoming thicker. You may also spot new buds growing in new places such as along the main cola. With buds abounding, your cannabis plants will get fatter every day. This is a surefire sign you are in full flowering mode. At this point, your plant will have a very intensive aroma. Ensure that you have a good ventilation system in place if you grow indoors or in a region that doesn’t allow for legal cultivation. The aroma will get the attention of your neighbors.

Some of your cannabis plants’ previously with white pistil hairs may now be turning darker into a brownish or amber color. At the same time, when you check the trichomes of your plant, you may spot some of them becoming opaque. The trichomes becoming milky white and the hairs turning darker are all signs of your plants not being too far from maturing and harvest.


Not all cannabis strains require the same amount of time for their flowering, but many varieties will be ready to harvest in these last three weeks. There are, however, not too many strains that will be ready before week 8.

Flushing Your Cannabis Plants

Depending on the flowering time of your particular strain, the time for flushing your cannabis plant is normally two weeks before harvest. When you “flush,” you stop administering nutrients and give the plant only plain, pH-balanced water in these final weeks. This will get rid of (flush out) salts and minerals in the soil which will make for a better and more pure-tasting bud. Otherwise, your smoke will be quite harsh and can have an unpleasant, chemical taste.

To find out when it’s time to harvest your Indica marijuana plant, you can use a jeweller’s loupe or a small microscope to regularly check your plants’ trichomes. You can observe whether the trichomes turn from clear to a milky white color. If many of the trichomes you see are still clear and transparent, it means it’s still too early for harvest. But when most of the trichomes have an amber color and an opaque clarity, this means that the THC content of the buds is at its maximum and the plant is ready for harvest. When it’s harvest time, it means reward time. Robert Bergman can give you more information about when and how to harvest Indica marijuana plants.

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