Temperature and Humidity for Growing Cannabis.March 9, 2019
Cannabis is a resilient plant, that will grow, and survive under many conditions. To grow the best, top shelf cannabis, you have to give the plants the best environment possible. That can be done keeping your grow room at the right temperature and humidity for growing cannabis
Some strains of cannabis will thrive under high temperatures, whilst others will be stressed to the point where they will stop growing. Always read what your cannabis plant is telling you, and look out for signs of heat stress, or other problems caused by the environment.
Anything that can be said about growing cannabis is a guideline, as each plant can grow differently. In this article we will look at the ideal temperatures and humidity for growing cannabis. It will give you an idea of a good environment for your plants to grow.
Seedlings and Cuttings.
Seedlings, and cuttings will need a higher humidity than bigger plants. This is because the roots are not well established. The plant will absorb moisture out of the air, through the leaves. So keeping the humidity high during the germination and early cutting stage is ideal.
Use a dome, or a propagator over your young plants to lock in the moisture. Alternatively, you could raise the humidity of the whole grow room with a humidifier.
Temperature and Humidity for Vegging Cannabis Plants.
As your plants grow bigger during vegetation, and the root zone grows, your plant will draw less moisture from the air. Instead, you need to encourage your plant to evaporate more water from its leaves. The more the plant can evaporate ( sweat), the more it will drink. The more it drinks, the more it eats. Reduce humidity as the plant grows, and they will grow bigger, faster:
Controlling the Stretch of a Cannabis Plant
After you have flipped to flower, the next few weeks you will see a boom in growth. Your plant will go through the ” Stretch”. A cannabis plant can double, maybe even triple their size in the first 3 weeks of the flowering phase. This is called regenerative growth ( the stretch), and the plant does it to prepare for the formation of massive colas.
The stretch be controlled by using temperature. Keep lights off temperature less than five degrees celsius lower than lights on temperatures. Read our in depth guide on controlling the stretch.
The Ideal Temperature and Humidity for a Flowering Cannabis Plant.
As flowers form, you will have to reduce your humidity. If humidity is too high in your grow room, you are at risk of mould and rot on your buds!
Low humidity will encourage your plant to evaporate more water through its leaves. This will help your plant eat more food, and drink more water. Which in turn, will make her grow faster and bigger.
By lowering the temperature during the flowering cycle, you will put your plants under less stress. Less stress means the plant can spend more energy on productive growth.
Reducing the humidity during the last couple of weeks of the flowering cycle will make your plant grow more resins and crystals. To get humidity so low, you will need a good dehumidifier.
How to Monitor Temperature of Your Grow Room
A “Hygrometer” is the best way to see if your grow room is at the ideal temperature and humidity for growing cannabis. These devices will tell you the temperature, and the room humidity of the grow room.
You must have at least one of these in your grow room. By monitoring the temperature and humidity of your grow room, you will give your plant a perfect environment. Then they can just sit back, relax, and grow fine flowers.
Other Devices for measuring Temps and Humidity
With the rise in technology, there are many gadgets you can now purchase that will monitor your grow room for you! Some of the products, will automatically measure and adjust your grow rooms environment to the setting you select.
It is easier than ever to keep track of temperature and humidity. By offering your plant the perfect environment, you are on the way to growing perfect cannabis plants.
Thanks for reading! You can find more information on anything related to growing in our cannabis grow guides. All of our guides are written by experienced growers, and members of our cannabis growers forum. If you have any questions, sign up. It is free, and we are always happy to help!