The Importance of Relative Humidity and Temperature

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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What You Need To Know About The Growing Period

Let's start off by looking at the seedling stage. Seeds are the variety of life and especially when it comes to Cannabis. Breeders have been crossing strains since the early 1970’s to provide the best range of genetic diversity on the planet. The seedling stage is the start of life for the plant and this is where much care needs to be taken in order to get the best possible start. When germinating seeds it is surprising how many people are unaware of the correct way to germinate seeds, however there are a few different ways which always work on the basis that the conditions are right.            

Soaking wet paper towels and leaving the seeds in a warm, dark place is the most popular way to get seedlings to sprout. Simply using 2 layers of tissue paper, soak to the point of becoming wet but not dripping wet. You will want the seeds to have plenty of air around so a waterlogged tissue will only prevent germination. Seeds also may go soggy and become mushy if the water content is too high. One issue that people can find when germinating seeds this way is that the tap root can grow long in search of a growing medium that it can anchor itself into and develop a sturdy taproot.

Upon seeing long, healthy taproots, as happy as a grower can be, planting the seeds without causing the roots to grow in the shape of a letter J can be easier said than done. What is an excellent technique is to place the tissue in an envelope or plastic sleeve and allow it to stand upright. This will encourage the tap root to grow down in the same way it would do in a growing medium and will also ensure that the J - Root does not happen.

Another simple way to germinate seeds that I personally prefer over other methods is to place the seedlings in a glass of water, approximately 2 inches high with water. Once the seeds float then within a few days all of the seeds will begin to open and tap roots will emerge. Some seeds may even germinate whilst floating on top of the surface of the water, but either way this is a sure way to germinate even stubborn old seeds.

A great part about germinating seeds in a glass of water, is adding Trichoderma fungi as an inoculant and sometimes a drop of seaweed extract to speed up the opening process. Seeds can show tails within 6 hours of dropping and swirling around in a cup and other seedlings may take up to 3-5 days. With anything to do with nature patience is the key to success.

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