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first stage of cannabis flowering

First Weeks of Cannabis Plants Flowering

The first stage of Cannabis flowering

Welcome everyone to this new article on the first flowering stage of Cannabis! In the last article, we quickly found out what the most frequent topics were regarding flowering stage of Cannabis plant. Today we are going to better analyze what will be the first stage of Cannabis flowering, very important to guarantee excellent and abundant harvest!

Separate the cannabis flowering into two parts

You may be wondering why we wanted to split the cannabis bloom in two. To answer this, we believe that the flowering phase includes two parts that must be distinguished. From a nutritional standpoint, the first stage will still require a high level of nitrogen. In the second flowering phase the plants will require more phosphorus and potassium, with little or no nitrogen.

Or again, in the first phase, Cannabis will still need high humidity, with a temperature above 25 °. In the last phase, the humidity and the temperature instead be lower, to avoid mold or infestations.

Hence, if we do not observe the existence of two different phases, problems with the cultivation of Marijuana.

first stage of cannabis flowering

How long does the first stage of cannabis flowering last?

In the first flowering phase, the cannabis will try to stretch, a sign that full bloom is upon us! But how long does the first flowering phase last? When will we have to change the parameters in preparation for the last flowering phase?

The first flowering phase begins after changing the lights for indoor growing. As for the outdoors, since the plants will show pre-flowers on each branch. It will then conclude 3-5 weeks later for the indoor, 4-7 weeks later for the outdoor.

It will therefore be important to keep the parameters of the vegetative phase in the first weeks of flowering.

You will soon learn that cannabis plants don’t change their needs overnight, but they take their time.

Techniques for the first stage of cannabis flowering

At this stage you can opt for more techniques, depending on what purpose you want to achieve. In fact, it is possible to apply from the defoliation technique to the Lollipop, from the last pruning to the LST (Low Stress Training). Much will also count from their accumulated experiences, but let’s see these techniques together in greater depth!

Defoliation Technique in the first stage of Cannabis flowering

The defoliation technique allows to obtain more light on the lower part of the plant. Normally, this part develops few and small inflorescences, with few terpenes and active ingredients. This technique allows, if done at the right time, to obtain excellent results even in the lower parts! it will be enough to remove 3 or 4 sundeck leaves a day for about ten days. by doing so, you will not put too much stress on the plant with a massive defoliation.

Lollipop Technique in Cannabis Growing

Contrary to defoliation, this technique eliminates low branches to concentrate all the plant’s energy on the tall flowers. It will therefore be sufficient to remove the branches manually, in order to leave only the highest and best exposed sites to the light.

LST Technique in the first stage of Cannabis flowering

With Low Stress Techniques we mean the bending of the stem of a Cannabis plant, so as to favor the light on the lower branches.

However, it is also true that, under the name of LST, various techniques are commonly included, including defoliation. This is because defoliation is a technique that causes a slight stress to plants, causing them to produce more trichomes to defend themselves against attack.

Topping on flowering stage

The last Topping technique, if done at the beginning of the first flowering phase, keeps the Cannabis plants lower and bushy. Be careful not to do it too late, or the result could leave you disappointed!

Correct nutrition and parameters

In this early flowering stage of Cannabis, the plants will require the same doses of fertilizer as the vegetative. The amount of phosphorus, potassium and microelements will be slightly increased, slowly lowering that of nitrogen.

If you are growing with organic fertilizer, the last vegetative vial can be given around the change of lights. For the mineral, on the other hand, you must be very careful not to go beyond the dosage recommended by the manufacturer. In fact, there is a risk of overfertilization, with consequent blocking of growth or, in the worst case, death of the plants.

The ambient temperature should be around 26-31 ° C, similar to the vegetative phase.

Humidity is also a parameter that will remain almost unchanged, as the plant will not stop growing and developing roots.

Tips and tricks

Did you notice that the cannabis plants were too tall when you switched the light cycle? Or have you forgotten to change the light cycle and the plants are now unmanageable? For this type of problem there may be, if not a solution, at least a palliative that limits the damage.

For example, changing the light to HPS too early will only increase the stretching phase of the plants. Conversely, if you wait two or three weeks for the change, the plants will remain shorter and bushy. This is because the redder spectrum of HPS lamps contains a high range of rays which causes plants to stand higher than a white light.

Avoid giving too much nitrogen in the first flowering phase. In fact, Cannabis plants have not stopped asking for it, but will begin to require less and less. Every trace of nitrogen contained in the flowers, as well as spoiling the taste and having problems burning, releases cancer cells (cancer cells) through combustion. It is therefore highly recommended to clean the roots of plants from nitrogen mineral residues with precision.

first stage of cannabis flowering

And that’s all for today, keep following us to find out more about “last stage of Cannabis flowering“!


Davide, CEO Founder & Geneticist