When you choose to water your plants can also help with absorption and prevent heat problems. To help keep your plants hydrated, water in the early morning before the sunrise and late in the evening after sunset. When you water at these times, your plants are better able to absorb more of their water because it does not evaporate as quickly.
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The good news is marijuana plants do not stop developing when there is too much heat. However, their growth will slow down. This is because too much heat affects the process of photosynthesis. The activities of the enzymes are also stunted, and the plants produce very few proteins. However, if it is exposed to heat for long durations, your plant might end up dying.
You can also use seaweed kelp extract to protect your marijuana plants while they are recovering from heat stress. This ensures the plants are protected from the possibility of contracting heat stress in the future.
Grow with the Sun
Near the end of your plant’s life, during the late flowering stage, humidity levels should range between 30-40%. Purchase a hygrometer to monitor the humidity levels of your plant’s environment.
In general, a sign of heat stress in marijuana plants are curling leaves. Here are some other signs to look out for:
What is the ideal temperature for growing marijuana?
Just like with too much heat, the main problem with cold temperatures is photosynthesis. If it is too cold, your plant will not undergo photosynthesis, and the leaves will develop a purple color. Marijuana plants grown in cold weather are also more susceptible to mold.
On the other hand, you also don’t want it to get too cold. When using a tent, the marijuana grow tent temperature should always be above 60ºF. Anything below that and the plant growth will be stunted, the plant may freeze, and it will eventually die. Sometimes you might experience a night or two where temperatures may fall below 50ºF, but as long as it is not prolonged, you don’t need to worry. Keep in mind, outdoor cannabis may die if the temperature drops below 40ºF. Some plants can withstand the cold, but their yields will be less than that of a typical plant because of delayed growth.
In order to properly measure temperature and humidity, you’ll need a thermometer and hygrometer. Best to invest in a digital one that can give you current readouts as well as highs and lows when you’re not inside the room. To raise heat, you’ll need a heater and to lower heat, you’ll need an air conditioner. These can be outside or inside the growing space depending on the size of your space and how much the temps and moisture levels fluctuate. A humidifier and a dehumidifier can be employed to raise and lower humidity rates. Larger grow rooms can benefit from a controller that uses a sensor to keep track of temps and humidity and turns on the appropriate appliance to regulate and keep them within your set parameters.
Ideal grow room temperature and humidity varies depending on the stage of plant life. Cloning requires higher temperature and humidity than vegetative growth and flowering plants have different ideal atmospheric conditions as well. In order to master the art of marijuana growing, dialing in the proper environment at the right time remains the most essential ingredient for success. So, what is the best grow room temperature and humidity level?
Because cannabis cuttings root best in warm conditions with high humidity, the cheap trays with clear plastic domes work remarkably well. In cool conditions, a heat mat should be placed underneath the trays to maintain an optimum temperature of 74-78 degrees F. and relative humidity at 75-85%. No matter where and into what medium you plan to root your clones, keep warmth and high humidity on your priority list. Clones allowed to get cold or dry will perish quite quickly. Too much humidity (over 90%) can also cause mold and rot, so cut a quarter-sized hole or two in your clear plastic dome to allow some air movement and circulation.
Measuring and Changing Temperature and Humidity
The best grow room temperature during the vegetative stage of growth is 70-78 degrees F. when the lights are on during the “daytime” and no more than 10-15 degrees cooler at “night” with a relative humidity of 45-55%. With these settings, your plants will best be able to convert light into energy for growth. This is the time when the plant puts on leaves and branches and expands it’s root system throughout your growing medium. If it gets too cold or hot, growth stops and you eventually risk losing your plants altogether.