Lesson 02: Ideal Temperature Thresholds Heating & Cooling

November 12, 2021

As a commercial cultivator or a hobbyist that grows cannabis you want to ensure that your plants have the optimal temperature parameters during each stage of growth. From greenhouse, outdoors, and indoors timing and understanding the controls that manage temperatures, whether that be artificially or

Figuring out the ideal cannabis temperature for your particular strain is essential to a fruitful harvest as well. Your seed provider will give you insight on what works best for each particular cultivar you are aiming to grow. Another shout out to

Humboldt Seeds Company is a great resource for plant genetics and can assist  in understanding your genetics temperatures.

In this cultivator resource article, you’ll discover all you need to know about controlling the temperature and what to do if it gets too hot or cold.

Why is the temperature important to grow cannabis?

As you may well know plants cannot create their own heat like animals can. A cannabis plant’s ability to grow and to its fullest potential heavily depends on the skill and expertise of the grower and the

The temperature for growing plays a significant role in cannabis growth. Temperature affects rates of cellular respiration, photosynthesis, and the prevalence of disease in cannabis thus making it an essential aspect for the cultivator to control and optimize.

Temperature and photosynthesis

Photosynthesis is positively affected by temperature until a certain point. Hotter than that, and the high temperatures begin to harm the plant. Lower temperatures, on the other hand, cause slower growth and a low yield.

Temperature and respiration

A higher cannabis growing temperature significantly increases cellular respiration, where it becomes more than the rate of photosynthesis. When temperatures lower, respiration decreases, and so does the rate of growth.

Temperature and disease

Like humans, cannabis plants are susceptible to disease—some diseases persevere better in warmer temps, while others in colder temperatures.

Growers more commonly encounter gray mold in cold climates with moisture. Root rot is more likely in summer, and pathogens like powdery mildew grow in humid conditions.

Best temperature ranges to cultivate cannabis

Clones, Seeds, Seedlings The ideal cannabis seedling temperature is between 68–77°F/20–25°C.
Vegetative Cycle This stage is best done between 68–77°F/20–25°C.
Flowering Cycle The best temperature for flowering cannabis is between 68–77°F/20–25C°.n
Late Flowering Cycle Here you can lower the temperature a little bit to about 64–75°F/18–24C°.
Finishing, Drying, Curing The best temperature and humidity for drying cannabis should be at about 70°F/21C°, and humidity at 50%.
Curing should happen at around the same temperature but between 58 and 65% humidity. n
Indica Strain Indica strains do better in colder climates than other strains. Popular strains include OG Kush, Purple Mountain Majesty, and Notorious THC.
Sativa Strain Sativa strains normally do better in warmer environments. Good strains include Hi-Biscus and Squirt.
Hybrid Strain This depends on whether it’s Indica or Sativa-dominant. Indica-dominant strains do better in cold climates, while the reverse is true for Sativa strains.

Manipulating the environment to the ideal temperature for growing cultivation is vital. Below you’ll find our best suggestions for the choice of temperature at the different stages of growth. Research the history of cannabis and you’ll see it started as a desert plant that was cultivated at high elevation. Even today, the professional cannabis cultivator optimizes their grow parameters with ideal day and night temperatures (DT/NT) to match the climate that cannabis prefers. The plant prefers warm days, and cool nights, especially as plants mature and start to flower.

During the day, cannabis plants prefer temperatures around 70 to 80 degrees Fahrenheit, but do best around 60 to 65 degrees Fahrenheit during the nighttime. This temperature change is surprisingly similar to that desert environment and is best utilized during the vegetative period of growth.

As the plants reach the flowering stage, it’s recommended to further drop the night temperatures between 50 to 60 degrees Fahrenheit to mimic the coming of winter plants would feel outdoors as you shift the light period.

The magic temperature for growing amazing cannabis tends to fall between 75- and 77-degrees Fahrenheit. However, it’s important to remember that grow operations with CO2 (1400-1600ppm) systems will need more heat, and should aim for around 80-85 degrees Fahrenheit during the vegetative period and lower temperatures during flowering and a tapering off CO2 prior to harvest.

If you missed Lesson 01: Genetics, The First Steps to Better Buds and Bigger Yields click the link and refresh yourself on taking the first steps to creating more yields and optimizing your grow from the start.

Thanks for reading and please visit our shop to get started on your grow and stay social with us and reach out to our team if you have any questions about your soil and fertilizer needs.

Learn more about Comanche Compost Co. and stay up to date with other giveaways and cultivation pop up events around you!

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