How to Get the Right Temperature for Growing Cannabis Plants

How to Get the Right Temperature for Growing Cannabis Plants

Growing temperature is very important to encourage photosynthesis and promote the health of cannabis plants. Improper temperature can make or break a crop and should be very carefully monitored throughout the plants’ growth cycle.

Temperature and Cannabis Plants

The temperature at which a cannabis plant is grown is vital to the health of the plant. Temperature affects internodal growth, the rate of water absorption, respiration, and the PH level of the growing medium. Sometimes even small variations in temperature over long periods of time can stunt growth and cause long-term problems in root growth. Changes in temperature can also be used to simulate nighttime as well as a tool to trigger flowering.

Ideal Temperature In Your Cannabis Grow Room

A standard, well ventilated grow room should be kept between 75-85 degrees Fahrenheit under optimal conditions. Temperature can be raised or lowered according to your plants’ needs. For example, if you’re providing extra CO2 to your plants, your cannabis grow room temperature should be raised to 86-90 degrees for efficient absorption. “Nighttime” temperatures should be slightly lower at about 71 degrees to prevent stretching but ensure your plants “sleep” and recover.

Measuring Temperature In Your Cannabis Grow Room

It’s best to measure the temperature in the shade of your grow room, as well as in several different locations. Using a digital thermometer with a separate sensor will allow you to measure temps from outside of the grow room while the lights are off.

Lowering the Temperature Of Your Cannabis Grow Room

HPS and other high output lights can produce far more heat than is safe for the survival of your cannabis plants. Always run an extractor fan when using these lights to circulate and pull heated air from your grow room. If your lights have ballasts or generators, keep them outside the growing area if possible. You might also consider air conditioning units, but only as a last resort as these can drastically increase your overhead costs.

Increasing the Temperature Of Your Cannabis Grow Room

You’ll rarely need to increase temps during “day” hours, as the lights typically are sufficient. At night, you can hold heat in your space by shutting off the extractor fan. You may need to add a simple space heater or radiator to supplement nighttime heat, though these can be costly to run. Monitor the temperature of your grow room carefully (both day and night) and adjust the heat accordingly for maximum efficiency.

The botanical experts at SoHum Living Soil know all of the best practices when growing cannabis. Let us share our knowledge with you by clicking through our articles on the subject or stop by our store in Denver to speak to our knowledgeable staff.

Image Credit: Photolona / Shutterstock.com

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