How to Get the Best Temperature for Indoor Marijuana

How to Get the Best Temperature for Indoor Marijuana:

The correct temperature plays a huge role in promoting the healthy growth of marijuana plants. In fact, it is responsible for many of the most vital functions such as photosynthesis and nutrient absorption. Therefore, messing up this seemingly tiny requirement can have disastrous results.

So, what happens when the temperature in the grow room is too high? Usually, it causes heat stress which reduces the accumulation of starch in the leaves. As a result, less food is available, making plants undernourished and get easily sick.

In the same way, low temperatures in the grow room also create problems. For example, a cold temperature depletes phosphate in the leaves which is vital for food production. Moreover, it also reduces evaporation through the leaves which lessen the suction force in the roots. When this happens, absorption of nutrients in the soil slows down.

Probably the most alarming of all is what happens to all the unused minerals. As they disintegrate around the roots, salts form which increases the acidity level. This type of environment blocks the roots from taking in nutrients as well as water. If left unchecked, the plants may stop growing and we will be left with nothing good to harvest.

As such, the wrong temperature creates serious nutritional problems for the crop. Therefore, our priority is to create a good climate in the grow room. In this article, we will learn what it is the perfect temperature and develop the skills to achieve it.

How to Get the Best Temperature in the Grow Room

For best results, make sure to provide the best temperature in the grow room. Fortunately, it’s easy to do this with the right information. So, get healthy and flourishing marijuana crop by applying the 5 tips below.

  • Find the Most Suitable Room
Find the Most Suitable Room

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The first thing to know about getting the right temperature in the grow room is that there are several factors in play. So, before anything else, we must consider these things.

First, the location of the grow room in the house is important. For example, it’s a lot cooler in the basement than in the attic with a flat roof. So, make sure to set up in the cooler part of the building.

Next, we must also consider the size of the room, the number of lights, and airflow. Collectively, they create a huge impact on the temperature of the grow area. Therefore, keep these requirements in mind when setting up the grow area.

  • Know the Perfect Range of Temperature
Know the Perfect Range of Temperature

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Like many plants, marijuana thrives in a certain range of temperature. This perfect range is achieved with consideration of the lamps since they are the biggest source of heat in the grow room. Hence, we must adjust the ideal temperature in relation to them.

When the lights are on, the best temperature to promote growth for the seedlings and clones is between 68ºF and 77ºF (20ºC and 25ºC). But as they mature, they evaporate more. Thus, they can tolerate up to a maximum of 82ºF (28ºC).

On the other hand, when the lights are off, it should be between 62ºF and 72ºF (17ºC and 22ºC). Also, remember to keep the difference of the temperature between day and night no more than 10ºC. But for best results, try to keep the difference at 5ºC.

  • Get a Good Thermometer
Get a Good Thermometer

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So that we’ll know if the grow room temperature is ideal, measure it with a thermometer. Luckily for growers, there are analog and digital thermometers that are available everywhere. Moreover, they’re cheap and reliable.

It’s a great idea to choose the one that has a built-in memory which shows the maximum and minimum temperature. Some thermometers have sensor on a wire, so we can hang the display outside the grow room. This way, we can see the temperature throughout the day.

In the end, the type of thermometer we should buy depends on our own preference. Just make sure to choose the one that is easy and comfortable to use.

  • Measure the Temperature Properly
Measure the Temperature Properly

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To get an accurate reading, always measure the temperature in the shade. This means avoiding the place right under the lamp since it will naturally be a few degrees warmer. Therefore, we must put enough distance between the plants and the lights. Otherwise, if they’re too near, the tips of the leaves may burn. Moreover, measure various places in the grow room as well.

  • Adjust the Temperature

Now that we know the correct range of temperature and how to measure it, it’s time to learn to troubleshoot.

  • Increase the Temperature

As discussed earlier, low temperatures can be damaging to the crop. So, how do we introduce heat in a cold grow room? When the lights are on, we don’t need to do anything much. Naturally, the heat from the lamps will radiate throughout the room.

  • Use a Fan
Use a Fan

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However, we need to distribute the air evenly to avoid cold spots. Using a swivel fan will take care of that. But we need to aim it between the plants and the lamps. Another way is to open the windows, granted that it is safe so that the air can help even out the temperature.

  • Invest in a Heater or Radiator
Invest in a Heater or Radiator

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Of course, when the lights are off, it can get cold in the room especially in the summer where it can be below freezing. Fortunately, we can do many things to restore balance in the temperature. First, use a simple heater with a thermostat. Oftentimes, this is enough to heat up the room.

We can also use a radiator with a thermostat and extractor for when the lights are off. The downside is that these methods use up a lot of electricity. However, they are necessary to ensure the healthy growth of marijuana.

  • Lower the temperature

High temperatures can affect the rate of photosynthesis. So, we must make sure that this doesn’t become a problem in the grow room. However, this can occur more often than we would like since grow lights produce a lot of heat.

  • Mind the Grow Lamps
Mind the Grow Lamps

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This is especially true with HPS lamps which can heat up the room up to 122ºF (50ºC). Of course, this temperature is fatal to the marijuana plants. So, if we want to use HPS lamps, we must adjust the dimension of the room. The rule of thumb is to always use a minimum space of 100cm x 100cm x 200 cm (3.2 ft x 3.2 ft x 6.5 ft) for a 600-watt HPS lamp. Or, we can use fluorescent lighting which doesn’t heat up the room as much.

  • Use Extractor Fans
Use Extractor Fans

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Aside from that, we can use an extractor fan to blow the hot air outside and suck in fresh air. For this, the formula is the number of watts divided by two = extractor in cubic meters (feet). To keep the smell of marijuana from going outside, put a carbon filter on it. It’s also a good idea to put ballasts outside the grow room since extractors create a lot of heat.

  • Run the Lights at Night
Run the Lights at Night

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If we want the easiest way to keep the temperature low, then we must run the lights at night. We do this by turning them on for a few hours after sunset, and turning them off about 2 hours after sunrise. As such, the lights are on at the coolest period of the day.

  • Invest in an Air Conditioner
Invest in an Air Conditioner

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For some professional growers, using an air conditioning unit is the best solution. This way, they can run the lights both during the day and night.

The Right Temperature in the Grow Room is Important

It’s very important to get the right temperature in the grow room if we want healthy marijuana plants. As we learned, the wrong ones have a significant negative effect on the
photosynthesis of the crop. Not only that, this problem can also affect the soil and other grow mediums.

Luckily, there are many ways to ensure that we get only the best temperature in the grow room. So, there’s no excuse to allow the plants to deteriorate. To ensure the healthy growth of plants, follow the tips mentioned above. They will help avoid serious problems that can be fatal to the crop.

As such, the correct grow room temperature ensures that that plants thrive and resist any diseases. So, in the end, having the skill to achieve this will result to an abundant and rich harvest of weed.

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