The right temperature for optimum cultivation

Cannabis likes a comfortable room temperature when grown indoors, or a little warmer – not too dry, not too humid. For many indoor producers, this is all you need what are cannabis trichomes? to worry about. If you feel too hot or too cold for you in your growing area, it is probably too hot or too cold for your cannabis plants.

Ideal temperature

The best temperature for growing cannabis is usually between 68-77 degrees (20-25 Celsius). If the ambient temperature around the plant drops well below 20-25 degrees, the growth of the plant will slow down and its potential yield will be inhibited or even stopped altogether. As a result, the plant never matures … It is important to note that the temperature is very important during a “day” cycle, when you let your plant take in the light. This is when photosynthesis and growth potential come into play. In addition, there should not be a big change in temperature between day and night.If your plant temperature goes above 77 degrees (25 Celsius), the metabolism of the plant will accelerate. So it will then ask for additional elements: more light, more water, more carbon dioxide, and more fertilizer etc … Make sure to allow the changes depending on the temperature. In other words, the ideal temperature It is wise to invest not only in a thermometer, but in a thermometer attached to a ventilation or heating system, so that automatically manages the temperature in your grow room. An automatic system can also provide excellent ventilation to get fresh air and prevent carbon dioxide shortages.

Vegetative and flowering temperature

Vegetative stage: young growing cannabis plants in the vegetative stage prefer warmer weather than the flowering stage, in the range of 70 to 85 ° F (20-30 ° C). Learn more about the times in the vegetative phase.Flowering phase: at the flowering stage (when the cannabis plants start to bud), it is best to keep the times slightly cooler, around 65 to 80 ° F (18-26 ° C) to produce the best color, trichome production and odor. There should be a difference of 10 degrees between the night and day times for the best results. This is particularly important in the flowering stage for the development of the highest quality buds.

Temperature too low

When the temperature approaches freezing, it is too cold for a cannabis plant to survive without damage. Colder weather will tend to slow growth. Temperatures below 60 ° F (15 ° C) tend to disrupt plant growth and freezing temperatures shock or even kill a cannabis plant. Frozen weed… Plants are more susceptible to certain types of mold when they are fresh, especially if they are also moist. Warmer weather and large temperature fluctuations contribute to excessive leaf purity and can also reduce photosynthesis.A plant that is grown in relatively cold weather can survive, but it will never grow as quickly or as well as plant that receives appropriate temperatures. Indoor plants tend to be much more sensitive to cold than plants grown outdoors.

Temperature too high

While cannabis plants do not usually die from heat, excessively hot temperatures will cause the plants to grow much more slowly. Note that temperatures above 26 ° C (80 ° F) in the flowering stage will not only slow down bud growth, but can reduce the potency and odor of your buds. Controlling the ambient temperature is particularly important in the flowering stage! Too hot … In the heat, cannabis is also more susceptible to many problems, including mites, white powdery mildew (especially if it is also humid), root rot, burning of nutrients (from increased water perspiration), increased stretching, wilting caused by root oxygen Deprivation and reduced "smell" of buds (because terpenes can burn at higher temperatures).


The ideal environmental humidity for cannabis plants is between 40-70%. To measure the humidity you need a hygrometer. An electric hygrometer is probably the best choice for most growers. It often has automatic features that provide more control over humidity. This is always good for indoor cultivation. The ambient humidity is an important factor (which also regulates the temperature) If the humidity of your plant drops below -40%, the plant will have a accelerated rate of sweating. There will be no big consequence. Your plant will simply consume water faster. As long as there is plenty of water in reserve, there is no problem. On the other hand, if the humidity is too high, your plant may have mushrooms, especially during the flowering period. And there, things rot very quickly … You will certainly need to dehumidify manually, in order to solve the mold problems and the consequences that result from it.

Where to measure?

The temperature must be measured at the canopy level and in the shade of the leaves. The canopy represents the tops of the plants, as close as possible to the lamp. The highest temperature is evaluated. The temperature peak is located (indoor) near the canopy. When measured in the shade, it represents the heat of the ambient air. As we would do with the weather. We measure the heat of the air here. This measurement is made from stomata. A stomata is a small orifice present in the epidermis of the aerial organs of plants (usually on the underside of the leaves). It allows gas exchange between the plant and the ambient air (dioxygen, carbon dioxide, water vapor …) as well as the regulation of osmotic pressure. Zoom on the stomata of cannabis So we measure on the stomata of the horizontal leaves, while remaining on the upper epidermis which is directly illuminated. We note that it is from 28/29 ° C as the stomata begin to close. Consequently, the temperature must be below this fateful limit. And so on taking the temperature where the stomata are located. That is to say in the shade of the leaves.

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