Best Ideal Temperature For Marijuana Plants Indoor
Marijuana plants are sensitive to temperature and they need the ideal climate to be able to grow well. For that reason, if you want to grow luscious marijuana plants with high levels of THC, the maintenance of temperature in your grow room is extremely important.
In general, marijuana plants enjoy an ideal temperature of between 20 and 25°C (between 68 and 77°F) when they are babies. When they enter vegetation, the temperature can be safely raised to 28°C (82°F) as a maximum. The temperature will naturally be lower at night-time, but the difference should never be greater than 10°C. In fact, maintaining a difference of 5°C between day and night is ideal.
The reason this is so important is because your marijuana plants rely on light and heat for photosynthesis. Light needs to be present in order to feed your plants, and heat is a natural consequence of that.
WHAT HAPPENS WHEN THE TEMPERATURE IS TOO HOT?
High temperatures are usually less of a concern than cold temperatures, as cannabis plants rarely die from too much heat. However, temperatures over 30°C will lead your plants to grow more slowly as the enzymes involved in photosynthesis aren’t able to work properly.
Apart from stunting growth, heat also attracts pests and diseases. Spider mites and white powdery mildew, for example, tend to thrive in hot conditions.
Hot conditions will also cause water to evaporate from your plant’s soil more quickly. Not only will you need to water your plants more regularly, but they may also struggle to take up the nutrients in the soil. This can lead to nutrient burn, which causes damage to your plant’s roots and foliage.
Also, remember that high temperatures combined with high humidity can expose your plants to a whole variety of additional issues. Plants growing in hot, humid conditions without enough air circulation can develop bud rot or mold, which causes a lot of stress on the plant and essentially destroys the buds you’ve been working so hard to grow all season.
Cold temperatures can be just as detrimental to cannabis plants as high temperatures. Unlike hot temperatures, however, extremely cold temperatures can shock plants or even kill them entirely.
As a general rule of thumb, cannabis growers should avoid growing in temperatures below 15°C (59°F). At these temperatures, your cannabis plant will struggle to grow and will eventually die.
Remember, cold temperatures can reduce a plant’s rate of photosynthesis just like hot temperatures. The enzymes responsible for the light-independent reactions of this process are not as active at low temperatures, meaning your plant will grow at much slower rates.
Lower temperatures can also create ideal environments for mold. Some molds prefer cold, damp environments, and may form on your plant’s roots, leaves, or buds should temperatures drop below an acceptable range.
Again, note that most cannabis plants prefer slightly colder temperatures at night (roughly 18°C). Some plants may also develop beautiful purple or blue hues when grown at lower temperatures, which can make for great-looking buds come harvest time. The ability to develop purple or blue hues, however, heavily depends on genetics and is seen more on indica plants like those native to mountainous regions (like Hindu Kush).
An accurate thermometer and hygrometer are essential so if you can purchase one that is a day/night or maximum/minimum type that would be best.
One that gives you the highest and lowest temperatures help you by making sure your growing environment stays within the ranges that are best for cannabis temperature to grow.
Outside of the ranges and there will tend to be more problems. Ideal temperature ranges for indoor growing is 72 – 76°F (22 – 24°C) and the night temperature can drop 5 – 10°F (2 – 5°C).
Though they should not drop (or rise) more than 15°F (8°C) at any time, as this stresses cannabis out when drastic temperature changes occur. Daytime cannabis temperatures above 85°F (29°C) or below 60°F (15°C) will slow growth and should be avoided at all cost.
Cannabis temperature that is below 50°F (10°C) will seriously stress the plants and lower productivity. If the electricity goes out in the middle of winter, be sure to be able to keep the room temperature above 40°F (5°C) to keep your plants alive.
You may need to purchase a generator to heat your water, your garden and your house, which you can usually do with your garden’s lights. If you are growing in a greenhouse be sure to always have black containers or 55-gallon barrels full of water in them.
During the day, the black containers of water will capture as much sun-heat they can hold or capture during the day and they will release the heat during cold nights. During the summer, you may want to have a white plastic to cover them up so the greenhouse does not heat up too much at night.
Cannabis is able to regulate its oxygen uptake in relation to the ambient air temperature surrounding the plant. Cannabis’s respiration rate approximately doubles every 20°F (10°C) in temperature change.
Temperatures above 85°F (29°C) are not recommended even when using CO2 enrichment in your garden, though many people say you **can** go up to 90°F (32°C) with C02. Ideal grow rooms are located underground since they take advantage of the insulating qualities of the earth.
Though many novice growers forget to think about the hot summer heat when they are building a grow room, especially when growing in the basement of a house. Cannabis temperature can heat up quickly and drastically affect your plants when the air temperature from outside is just as hot as the air going out.
Be sure to have a plan set in place to be able to combat the high temperature of summer heat.
Indoor growing
Indoor growing temperatures are directly controlled by the grower, leaving as much room for error as there is for success. All you must do is make sure your grow room maintains the correct temperature.
Here’s the problem:
The ideal temperature in your grow room depends on several factors. The location of your room in the building is an important one for example. A basement grow room is a lot cooler than in an attic with a flat roof.
Aside from that, the size of your room, the airflow, the number of lights and the extraction rates play an important role. Keep this in mind when building your grow room.
When the weed grow lights is turned on, an ideal temperature for the cuttings and seedlings is between 68ºF and 77ºF (20ºC and 25ºC). As the plants get older, they can evaporate a little bit more, and the temperature may increase to a maximum of 82ºF (28ºC).
When the grow lights are off, the temperature should lie between 59ºF and 72ºF (15ºC and 22ºC). Another important rule is that the temperature differences between day and night cannot be too high, a maximum difference of 18ºF (10ºC). So, when it’s 82ºF (28ºC) during the day, it cannot go below 64ºF (18ºF) at night.
In general, marijuana grown indoors functions best at moderate temperatures between 68 and 77°F (20-25°C) during the light period and a drop of no more than 18°F (10°C) to 60°F (15°C) during the dark period. CO2-enriched plants will produce more at a marginally higher temperature of just under 82°F (28°C).
If the floor can have a steady temperature at around 80°F (27°C), the roots will be warmed, and the stems and leaves will withstand influxes of colder air. A heating mat is ideal if you’ve only got a few plants to worry about.
Larger gardens might require the use of a recirculating hot water heater to ensure optimal temperatures.
Indoor growing temperatures are directly controlled by the grower, leaving as much room for error as there is for success. All you must do is make sure your grow room maintains the correct temperature.
Here’s the problem:
The ideal temperature in your grow room depends on several factors. The location of your room in the building is an important one for example. A basement grow room is a lot cooler than in an attic with a flat roof.
Aside from that, the size of your room, the airflow, the number of lights and the extraction rates play an important role. Keep this in mind when building your grow room.
When the weed grow lights is turned on, an ideal temperature for the cuttings and seedlings is between 68ºF and 77ºF (20ºC and 25ºC). As the plants get older, they can evaporate a little bit more, and the temperature may increase to a maximum of 82ºF (28ºC).
When the grow lights are off, the temperature should lie between 59ºF and 72ºF (15ºC and 22ºC). Another important rule is that the temperature differences between day and night cannot be too high, a maximum difference of 18ºF (10ºC). So, when it’s 82ºF (28ºC) during the day, it cannot go below 64ºF (18ºF) at night.
In general, marijuana grown indoors functions best at moderate temperatures between 68 and 77°F (20-25°C) during the light period and a drop of no more than 18°F (10°C) to 60°F (15°C) during the dark period. CO2-enriched plants will produce more at a marginally higher temperature of just under 82°F (28°C).
If the floor can have a steady temperature at around 80°F (27°C), the roots will be warmed, and the stems and leaves will withstand influxes of colder air. A heating mat is ideal if you’ve only got a few plants to worry about.
Larger gardens might require the use of a recirculating hot water heater to ensure optimal temperatures.
Temperature at Different Stages of the Cannabis Plant
As the cannabis plants develop, they will need different temperatures in each life stage. For outdoor growers, this is less of an issue since outdoor plants can better withstand temperature fluctuations.
But for indoor growers, the perfect temperature can be tricky to maintain. Luckily, many research has helped us figure out these ideal temperatures.
Seedlings and Clones
Both seedlings and clones lack developed root systems, so they largely depend on their leaves to get water. Therefore, they need high humidity until their roots form fully. Hence, many growers use a humidity dome for seedling and cutting so they can easily get moisture from the air.
Ideally, the temperature should be between 68-77°F (20-25°C) with high humidity for both. At these temperatures, roots could form quickly, and our tiny plants will continue to grow to the next stage.
Both seedlings and clones lack developed root systems, so they largely depend on their leaves to get water. Therefore, they need high humidity until their roots form fully. Hence, many growers use a humidity dome for seedling and cutting so they can easily get moisture from the air.
Ideally, the temperature should be between 68-77°F (20-25°C) with high humidity for both. At these temperatures, roots could form quickly, and our tiny plants will continue to grow to the next stage.
Vegetative Stage
As the young plants start to grow more leaves, they prefer a high humidity of at least 70% and temperatures between 68-77°F (20-25°C). But as they get older and their roots expand, they begin to tolerate a slightly lower humidity.
So, for the most part, the ideal temperature during the vegetative stage is between 68-77°F (20-25°C). This goes well with moderate humidity if we also make sure to provide cooler temperatures during dark periods. This will encourage bigger and faster growth.
Just don’t let temperatures drop below 59ºF (15ºC). In general, older plants are more able to survive in cooler temperatures and lower humidity during the day.
As the young plants start to grow more leaves, they prefer a high humidity of at least 70% and temperatures between 68-77°F (20-25°C). But as they get older and their roots expand, they begin to tolerate a slightly lower humidity.
So, for the most part, the ideal temperature during the vegetative stage is between 68-77°F (20-25°C). This goes well with moderate humidity if we also make sure to provide cooler temperatures during dark periods. This will encourage bigger and faster growth.
Just don’t let temperatures drop below 59ºF (15ºC). In general, older plants are more able to survive in cooler temperatures and lower humidity during the day.
Flowering Stage
Once the plants start to bloom, they can thrive at a comfortable temperature with low humidity. However, if we are nourishing them with CO2, the temperature must remain under 82°F (28°C).
These lower temperatures are vital during the flowering stage as it preserves the integrity of the terpenes in the buds. To get weed that has rich taste and smell, we must make sure not to destroy the terpenes with high heat. Otherwise, we will be literally burning all the good stuff away.
So, keep the temperatures comfortable especially after week 6 or 7 when terpene production is at its peak. We can also make the temperature during dark periods slightly cooler to trigger more terpenes. This will also encourage the buds to produce more vibrant colors depending on the strain.
Once the plants start to bloom, they can thrive at a comfortable temperature with low humidity. However, if we are nourishing them with CO2, the temperature must remain under 82°F (28°C).
These lower temperatures are vital during the flowering stage as it preserves the integrity of the terpenes in the buds. To get weed that has rich taste and smell, we must make sure not to destroy the terpenes with high heat. Otherwise, we will be literally burning all the good stuff away.
So, keep the temperatures comfortable especially after week 6 or 7 when terpene production is at its peak. We can also make the temperature during dark periods slightly cooler to trigger more terpenes. This will also encourage the buds to produce more vibrant colors depending on the strain.
Harvesting and Curing
Half of what determines superior marijuana is the temperature during the curing period. So, continue to ensure ideal temperatures after harvest. Keep temperatures around 64°F (18°C) and the humidity at 45%. This will get us more potent and great-looking buds that produce smoother taste.
It’s also important to create air flow around the buds, but not directly on them to avoid drying too quickly. The key is to focus on maintaining the right temperature and humidity for at least 10 days. This will prevent molds from forming as well as over-drying which guarantees the best weed possible.
Half of what determines superior marijuana is the temperature during the curing period. So, continue to ensure ideal temperatures after harvest. Keep temperatures around 64°F (18°C) and the humidity at 45%. This will get us more potent and great-looking buds that produce smoother taste.
It’s also important to create air flow around the buds, but not directly on them to avoid drying too quickly. The key is to focus on maintaining the right temperature and humidity for at least 10 days. This will prevent molds from forming as well as over-drying which guarantees the best weed possible.
Measuring temperature in your marijuana grow room
You measure the temperature in your marijuana grow tent with a thermometer. There are analog and digital thermometers, and they're for sale everywhere for a few bucks. I always use a digital thermo/hygrometer with a built-in memory, so I can see what the maximum and minimum temperature was. It's also a good idea to get one with a temperature sensor on a wire, so you can hang the display outside your grow room, and can see the temperature when the lights are off.
Always measure the temperature in the shade, and at various places in your growing room. Provide good air flow by placing several fans. The lamps emit radiant heat which does not affect the air temperature. Therefore it will always be a few degrees warmer right under the lamp than a shaded spot. That is not really an issue, but make sure there's enough distance between the lamp and the plant, so the tips of the plants won't literally burn.
Marijuana plants thrive in comfortable temperatures much like humans do.
With the wrong temperatures, they can deteriorate, and we can end up with a disappointing harvest. So, pay attention if it’s hot, cold, humid, or dry in the grow area. Then makes sure to adjust the temperature to its optimal level.
To develop this skill, we must learn as much as we can about the subject. Like most excellent weed growers, we must be well-informed about the basics of temperature. In the long run, this will result in more bountiful harvests of potent buds.
So, if we care about getting great weed, we must learn to provide the optimal temperature at every stage of the plants’ life.
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