As the name suggests this is the point in the life cycle of the plant where it will grow leaf and stems and develop its initial structure. The reason why plants are given a light cycle of 18 hours of light and 6 hours of dark is to imitate the seasons and by replicating the same climate from Spring until Summer, plants will grow only vegetative matter. This stage is a big player in determining the final size of the plants, as well as the final canopy structure, the development of the root zone, potential flowering sites and how efficiently your plant will bloom.
The same way that seedlings require high humidity and warm temperatures, the very same applies during the vegetative stage in order for plants to be able to perform to their best ability. The day time temperatures will be fixed as close to 24 degrees Celsius and with a night-time drop of 5-8 degrees Celsius.
Relative humidity needs to be close to 70-75% and the reasons for this are to provide hot humid days as you would find outside. Stomata which is responsible for absorbing carbon dioxide from the air function best when the humidity is high. When relative humidity is low, stomata will close up and the function of photosynthesis will also cease. This is one reason why plants will wilt and close up if the air is too dry.
The very best way to stay on top of your temperature and relative humidity during the 18/6 period is to install a humidity controller that will be programmed to your settings. The controller will be connected to a humidifier that will kick on and off when the level of humidity becomes too high or too low based on the setting. By having this little helper in the grow room, I am able to be away from the garden and know that my environment is perfect and the rate of photosynthesis is the best it can be.
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