What are the best temperature & humidity levels for growing marijuana? – Hon&Guan

What are the best temperature & humidity levels for growing marijuana?

High-value plant: Marijuana grows well indoors because it is very sensitive to light and other things. Each stage of marijuana growth needs a different kind of tune-up to get the best growth and the best yields. Not only does humidity play a big part in the growth of this plant, but also in making sure that it is properly cured and stored.

When it comes to growing marijuana, many people pay attention to how the soil is and how many nutrients the plant has. But it's the environment that really matters. One of the things that affect the growth of marijuana is humidity.

As water vapour moves through the air, humidity can be called the amount of water in the air. Most of the time, there are three types of humidity:

  1. A measure of how much water vapour is in the air is called specific humidity. This is how much water vapour is in a given amount of dry air.
  2. Absolute humidityrefers to the amount of water vapour that is in the air in a given place.
  3. In this case, relative humidityis how much water vapour is in an area in comparison to how much water vapour the area can hold.

A plant's relative humidity is used in the same way that it is used in the growth of any other kind of plant. It's also important to note that humidity and temperature are linked. The more water vapour an area can hold, the more water it can hold.

A lot of moisture and heat:

Water vapours are always in the air. In a grow room, the leaves will already be evaporating water through their leaves. Plants only use 10% of the water they take in for growing. The rest (90%) has gone away. Only this much water vapour can be in the air at one time. If this amount is exceeded, the condensation process starts. During this process, water droplets are formed on the cold parts of the room or plants.

Water vapour in the air is based on how hot it is outside. Warm air can hold a lot more water than cold air.  It shows how much of that water vapour is already there. Suppose this is 70% water vapour. Some more water vapour can be added before water drops start to form. It's not the same to say that 70% humidity at 77 degrees is the same as 70% humidity at 68 degrees. Warmer air can have more moisture in it. As long as it's 77 degrees outside, 2 pounds of air can hold 0.45 ounces of water vapour in it. When it's 68 degrees outside, two pounds of air with a relative humidity of 70% can only hold 0.32 ounces of water vapour in it.

How temperature and humidity level work together?

It's important to know that humidity levels and temperature levels are linked together. There is a lot of talk about humidity, but when we talk about it, we usually talk about relative humidity (RH), which is how much water vapour is in the air compared to how much water can be vaporized at that temperature. When you know that warm air can hold more water vapour than cold air, you get the whole picture. One reason we need to get rid of a lot of warm air from our grow room and let cool air in is because warm air holds too much water vapour.

Your marijuana plant will react to temperature changes in different ways depending on how far along they are in their growth. It's important to make sure your plants get the right temperature for each stage of growth they are in. If you want your plants to grow, here are some ideal temperatures for each stage of growth.

Seeds and clones:

Clones don't have roots yet, so they get their water from the air. Because they need a lot of humidity until they have fully formed roots, they need a lot of water. If you want to keep your clones from getting too dry, you may want to put them in a humidifier dome.

Plants in the vegetative stage:

Young plants like high humidity (70 percent or more) and temperatures between 68-77°F (20-25°C) during this stage. However, as the plant ages, a little less humidity is fine. This is more of a problem for plants that are grown indoors, because outdoor plants can handle more temperature changes.

During the vegetative stage, the ideal temperature is between 68-77°F (20-25°C) with moderate humidity, but it should also be a little cooler during the dark periods."Cool nights" times are ideal for encouraging growth. Take care not to let the temperature fall below 59 °F (15 °C). The plant should be able to handle cooler temperatures during the day and dry air when it grows up.

The flowering stage:

In the flowering stage of your plant, it can live in a room that isn't too hot or wet. If you aren't adding extra CO2 to your grow room, you should keep the temperature below 82°F (28°C). You can smell and enjoy the buds before you burn them at these lower temperatures.

Avoid temperatures above 82°F (28°C) because they make terpenes evaporate and they also slow down the growth of your buds. A lot of the good stuff in your buds could be burned away as they grow if the temperature is too high. By the time you pick them, there will be very little taste or smell left.

During each stage of the growing process, the ideal humidity for marijuana should be different.

Outdoor marijuana plants need a lot of humidity

Outdoors, you can't do much about the humidity. People can live with high humidity in spring and early summer because there aren't any buds for the water to get into. You'll see that the plant is very wet in the morning because of the dew. As the sun comes out and the day goes on, this all evaporates without a hitch.

But after the summer, the plants start to flower, and the weather changes. It gets colder and it rains more often, which makes the air more humid. There are times when the sun doesn't come out and the temperature isn't high enough to get rid of the dew. Large amounts of rain can also be bad.

During watering, humidity

When you water your marijuana plants, the humidity rises a lot. That's great when the plants are growing. You could also spray the floors and walls (if they're covered with waterproof foil) to make them more humid. Some plants may become too humid after they have been watered, so they may not be able to flower. When your lights go out, the temperature usually drops and you won't have to get rid of as much air, which makes the humidity rise.

Adjusting humidity levels and temperature levels

 This is the time to get down to business and figure out how to fix things when they're not. Most growers will have a hard time keeping both the relative humidity and the temperature down, which is very important during the flowering period. In some places where it's colder, and depending on the lighting solution, the opposite might be true, and the temperature or humidity level must be raised.

Remember that warm air can hold more water than cold air? Keep this in mind, and be aware of the fact that relative humidity and temperature work together to make a whole.

Ways to make it less humid:

  1. Run your existing tube vent at a higher speed or get a new one that lets air out of both the tent and the room it is in.
  2. Make sure there is enough fresh or cool air coming in (e.g; by using 140mm case fans for PCs).
  3. Try to water your plants when the lights come on.
  4. Buy a good-sized dehumidifier to keep your home dry.

Ways to make the temperature go down:

  1. Make your room more airy by allowing more warm air to be pushed out and more cool air to come in (higher velocities or bigger tube vent)
  2. In the daytime, keep the lights off, and turn them on at night.
  3. When you grow with HPS lights, think about using a cool tube to keep your plants cool.
  4. Put in an air conditioning unit.


Should humidity be low or high for Marijuana plants?

70 to 40% of the time, marijuana plants are grown in a relative humidity range. This isn't too hot or too cold. As we talked about in the previous paragraph, both extremes of relative humidity could cause marijuana plants to stop growing. It's also important to know that high humidity can help mold grow, which could hurt the growth of your marijuana plants.

Can marijuana grow in the wrong temperature?

You should keep the temperature at these numbers for the best results. Some strains that are hardy, like those for growing outside, can grow in temperatures that aren't as warm as they should be.

How Much Humidity Do I Need in My Grow Tent to Make It Grow?

When you grow marijuana in a grow tent, things like humidity and temperature need to be kept in check. By now, we know that different stages of the marijuana plant need different levels of humidity. It would be good to keep the humidity in your grow tent high for marijuana seedlings. A lot of things can change the amount of humidity in your marijuana grow tent.



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