Growbox, Temperature And Humidity: All You Need To Know

What is the key point to start from when approaching indoor growbox cultivation? It is important to try to recreate an environment that is healthy and healthy for plants. This means that temperature and humidity will become the two basic parameters to start from.

You should know that even the most advanced indoor growing techniques can be irrelevant if these two values are not controlled. On an environmental level, you will always have to take into account any overhang, unexpected weather conditions and act accordingly. After all, without a careful program that allows you to organize them, you will not be able to count on the success of the cultivation. And this has an effect on the quality and good flowering of the plants.

Relative Humidity In Grow Boxes

The first clarification to be made is on the measurement of these two factors: the temperature is in degrees and the humidity in percentage. If we let the latter reach 100%, our growbox will not be able to absorb water vapor. It will be saturated and the water will settle between walls, leaves and pots. Unfortunately humidity is the most delicate factor, as it is difficult to tell how much is in the air. It is not by chance that we will speak of “relative humidity” because it is not an absolute value. The capacity of the air to retain water vapor is relative and it alters according to the same temperature. Usually hot air retains more humidity, while cold air retains it less. The important thing is to find the right balance!

If, for example, the humidity is over 90%, the air fills with water and we will not have the correct transpiration from the stomata of the leaves. This can lead to mould and fungus. If the humidity drops below 40%, the plant closes the stomata. Even in this case we will not have the correct transpiration and the speed of growth will slow down.

Ideal Temperature And Humidity In The Grow Box

The humidity to be maintained in order to maximize indoor cultivation will have to be in accordance with these values:

  • During the germination phase: 80% humidity;
  • During the vegetative phase: between 60% and 70%;
  • At flowering: between 50% and 60%.

As far as the temperature is concerned, you will have to refer to these parameters:

  • During the germination phase: between 18° and 24°;
  • During the growth phase: between 14° and 29°;
  • During the flowering phase: between 14° and 27°.

The Importance Of The Thermo-Hygrometer

The thermo-hygrometer will therefore be very important to always be able to give a value to the humidity in the grow room. With time and with the right experience, in fact, you learn to know the typical characteristics of the grow box, adapting the environment to the needs of the plants. For example, if we have the same amount of water vapor in two different environments, do you know what could happen? In a warm environment the air will hold more water vapor and the thermo-hygrometer will give a humidity value that is lower than in a cold temperature environment.

A delicate point is the transition from daytime to night, when the values could suddenly become unbalanced. When we go to turn off the lamp, or the timer set ensures this transition, the bulb will stop heating. In this way the air and temperature in the grow box will go down. It’s only a matter of a few minutes. If this step is done too fast, the humidity level may rise and touch dangerous values.

How To Lower Temperature And Humidity

But let us now move on to practice, having explained the fundamentals of this subject. There are special ventilation systems to lower the humidity. All you have to do is increase the flow of fresh air by evaluating the size of the inlet. Also try watering when the lights come on. And finally, it might be useful to make a small investment by buying a dehumidifier.

To lower the temperature, it’s similar: increase the airflow in the grow room. That way you can help the hotter air to come out. We also recommend that you keep the lights off during the day and turn them on at night. You can also consider installing an air conditioning system, so you can also work on humidity.

How To Increase The Temperature And Humidity Level

To increase the humidity levels, all you need to do is get a spray of water: it’s a manual solution that lasts very little. So try to keep the earth wet (but not soup) at all times. And finally a good idea is to put open containers with water in your grow box.

To increase the temperature you can instead install an electric stove, taking care not to heat the room too much, ruining the whole cultivation. To optimise the heating process, you can install a thermostat or other heating device upstream of the stove.

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