Younger cannabis plants grow better in higher humidity than more mature plants. Slowed Growth: If humidity levels are not optimal for the growth stage, they don’t grow as fast as they could. Nutrient Problems: If a cannabis plant takes in too many nutrients at once the leaves will turn yellow and the tips will look burnt, called nutrient burn or nute burn.Ĥ. If caught early enough, it can be prevented, if not the plant will become unusable.ģ. White Powder Mildew: White Powder Mildew (WPM) is a rapidly reproducing fungal disease resulting in a white powder or mildew covering the plant. When this happens the buds are unusable.Ģ. Bud Mold/Rot: A condition when the inside of the plant is taken over by mold. Humidity levels must be monitored to prevent:ġ. Monitoring and having the right humidity encourages strong, healthy, nutrient-dense leafy plants with optimal growth. On the other hand, when the humidity is low, cannabis plants will take more water through their roots. When the humidity is high, plants use their leaves to absorb moisture from the air which results in less water drawn from their roots. Throughout every stage of growth, cannabis plants will have a constant need for water which the amounts will fluctuate with the humidity. Horticulturalists know that the key to success in any growing plant is understanding the lifecycle of the plant. The warm air alone has way too much vapor for ideal growing conditions. It is necessary to extract the warmest air from the growing environment while allowing cool air to enter. The premise is that warm air holds more water vapor than cold air so it is important to get the warmest air in the environment. Relative humidity (RH) which is one way to measure humidity levels, is how much water is in the air compared to the maximum amount of water that can be held in the air at that temperature. Temperature and humidity levels interact and are very similar and are closely related to one another. Humidity is the measure of how much humidity is actually being held in the air. What’s the Difference Between Temperatures and Humidity Levels? Temperature and humidity monitoring are essential for growing healthy cannabis plants throughout the entire life of the plant…seedling to harvest. This means that more and more legal growers (under strict governmental regulations) will be on the American horizon seeking the best indoor growing practices. Legal sales of marijuana are expected to increase from $10 billion in 2018 to $20 billion by 2022, according to the Marijuana Business Fact Book. The marijuana industry created an estimated $34 billion economic impact in 2018.

Marijuana seedlings turning yellow