Unless you’re equipped with a special grow room climate control system, you’ll need some tips on climate control, and even if you have one, they wouldn’t hurt, so here goes – the 5 most important things you need to know about grow room climate control.
The best temperature for weed to grow in is in the range of 68-77 degrees (20-25 Celsius), although it varies depending on the strain. If the air temperature is significantly lower, plant growth will start to slow down; it might even cease! The temperature is more important to be maintained during the day, but there shouldn’t be major swings between day and night temperature. If the temperature is higher, the plants will start growing faster and need more water, light, fertilizer and carbon dioxide.
Be sure to plan in advance for changes in temperature, and use a thermometer which is attached to a ventilation and heating system, so that it manages the temperature automatically. Find a balance and make adjustments that work together; for instance, if things usually run hot in your room, consider lower temperature LED Grow Lights, ventilation, and cooling.
2. Carbon dioxide
Plants use up carbon dioxide very quickly; if there isn’t enough in your grow room, the plants won’t grow. The ratio and volume of carbon dioxide in the environment of your grow room is also something that an exhaust and ventilation system would help with. Carbon dioxide is denser and heavier than oxygen, so a ventilation system will mix it up and make sure that it gets to your plants.
The system needs to work the entire time you have lights on when you’re not adding extra carbon dioxide directly into the environment, because photosynthesis uses it up very fast.
You need a hygrometer to measure the humidity in the environment. Ideally, it’s between 40-70% for weed. An electric hygrometer is probably the best option because it’s the most precise and often lets you adjust the humidity automatically. If the humidity is too low, you’ll need more water for the plants. If it is too high, the plants may become infected with fungus, especially during the flowering period. We recommend having a dehumidifier to resolve moisture issues as they arise.
4. Ventilation and air flow
Proper air movement in a grow room can be difficult to control, but it’s necessary. In nature plants have wind as a natural source to strengthen their integrity and rain to get rid of dust and parasites. You need to recreate this type of environment as best you can. Make sure that your ventilators are in the right position. There should be two facing each other to move all of the air around. This sort of setup helps balance temperature, humidity and carbon dioxide ratios. You can point the ventilators toward the ceiling if the humidity is too high. Another option is placing them on the same level as your grow lamps. This will help reduce the temperature in your grow room and blow the hot air around the lamps out.
In conclusion, don’t forget that it’s best for your cannabis plant to get lots of CO2 and fresh air. Your exhaust and ventilation system should be on all day long to ensure this.
Missing the right levels of fertilizer could severely inhibit the growth and potential yield of your plants, in some cases completely destroying them. You’ll need to provide extra fertilizer as you adjust carbon dioxide levels. If you manage this factor extremely carefully, you will end up with a much higher yield in the same grow time, but you will need to make some effort.
Fertilizer is really important if you want a strong plant with very tight buds and internodes that can be harvested quickly.