Temperature for growing hemp

One of the main tasks of the grower when growing cannabis is to maintain a favorable temperature regime. The plant will grow vigorously and bear fruit abundantly only within the limits of certain temperature values, which differ depending on the stage of development of the seedling.

It should also be borne in mind that different types of cannabis tolerate cold and heat differently. Due to the climatic conditions of their natural habitat, indica prefers a cooler climate, while sativa, on the contrary, feels more comfortable in a hot environment and does not tolerate cold.

Do not forget about the temperature of the soil, because the root system is an integral part of the plant, without which it simply cannot exist. The roots should be in a comfortable environment, one of the defining elements of which is temperature. Even in the best soil, marijuana cannot survive if it is chilled or overheated.

Favorable temperature for marijuana

Germination phase

To germinate seeds, the grower needs to create a humid environment, the temperature of which will not be lower than 15 degrees. In nature, they begin to sprout from the soil in just such conditions. The highest percentage of seedlings is observed at a thermometer reading of 21-32 degrees. The most favorable mark is considered to be 27 degrees. All types of cannabis have the same temperature preferences at this stage of development.

Vegetation phase

After the transition to the growing season, the plant’s immune system is strengthened, which makes it more resistant to negative environmental factors. The minimum value of the favorable temperature decreases, and it differs for each species.

For indicas and most autos, a favorable daytime temperature is 20-28 degrees. At night, it is allowed to decrease to 18-24 degrees. Many manufacturers talk about the positive properties of such fluctuations;
For sativa marijuana varieties, the daytime temperature should be between 22 and 30 degrees. At night, it should not fall below 20 degrees.

Flowering phase

During the flowering phase, the maximum temperature limit for cannabis is reduced:

For indica and autos, it is 20-26 degrees;
For sativa, its borders are between 22 and 28 degrees.
A higher temperature value can negatively affect the quality of the finished product. The fact is that under the influence of heat, the resin of the plant begins to evaporate, which leads to a deterioration in the taste, aromatic and effective qualities of the buds. It is especially important to adhere to this temperature regime during the last 6-7 weeks of flowering, because this is the time when resin production peaks. Do not forget about the favorable level of humidity at this stage of plant development, because its increased value will certainly lead to the appearance of mold in places with poor air circulation.

Soil temperature for hemp

Only with a healthy and well-developed root system will the aerial part of the plant be able to fully meet the grower’s expectations. The most favorable temperatures for marijuana soil are:

The minimum indicator for germinating seeds is 8-10 degrees;
During the growing season – from 18 to 20 degrees;
During flowering – from 24 to 26 degrees.

At what temperature does hemp die?

File – In this Dec. 5, 2013 file photo, marijuana matures at the Medicine Man dispensary and grow operation in northeast Denver. Colorado voters still support the state law that legalized recreational marijuana, but most believe it is hurting the image of the state, according to a new poll released Monday, Feb. 10, 2014. The Quinnipiac University Poll found that 51 percent of voters overall believe the measure is bad for the state’s reputation, while 38 percent see it as a net positive. (AP Photo/Ed Andrieski, file)

Too low or high ambient temperatures can lead to partial damage or complete death of the plant.

When the thermometer reads 15 degrees, the growth of marijuana stops. Her immunity is weakened, the process of photosynthesis begins to proceed much more slowly. The chlorophyll content in the plant tissues decreases, which leads to a change in its color to purple, black or blue. In conditions of high humidity, the chances of mold infestation are greatly increased. The only exceptions are cannabis varieties for cold climates. Due to the climatic conditions of the natural habitat to which they have adapted over the years, such plants do well at low temperatures. These include some highland indica varieties, as well as autos with a lot of ruderalis genes.

The upper threshold of the critical temperature for cannabis is 35 degrees, but already at 30, its growth and development begin to slow down. Terpenes and cannabinoids begin to evaporate from the surface of the inflorescences, which greatly affects the quality of the finished product. The rootstock becomes vulnerable to insects, root damage, water depletion, and nutritive burns. This greatly increases the chances of her death. Only a few tropical sativa varieties can tolerate high temperatures. If your region is famous for high temperatures, we recommend choosing a cannabis strain for hot climates. They are loyal to high temperatures, but it should be borne in mind that an excessively high Celis degree and drought can bring a lot of trouble even to the most persistent fighters.