Cannabis Seed Germination Temp And Humidity

Our guide will go over the importance of Seedling Temperature and Humidity and why that is important for growing marijuana seeds. Temperatures and Medical Cannabis Growing: From Seedling to Harvest The marijuana industry created an estimated $34 billion economic impact in 2018. Legal sales of marijuana are expected to

Our Guide On Seedling Temperature And Humidity | Growing Tips

Cannabis seedlings are just like any other plant seedlings. They require optimum temperature and humidity for their survival and growth. You may ask what is the ideal seedling temperature and humidity or how much is it needed? Our guide will go over everything you need on Seedling Temperature and Humidity.

Well, ensuring cannabis seedlings have an optimum temperature and humidity is necessary for their efficient growth. These conditions should be provided in a regulated manner. And during each stage of growth, temperature and humidity will vary.

For example, cannabis seedlings need temperatures that are a little warmer and not too dry or humid. This is simply because high/ low temperature will obstruct plants’ physiological processes such as respiration, photosynthesis, and transpiration.

Getting your plants to the right conditions and knowing how to apply will be crucial. And so, here is a seedling temperature and humidity guide for you.

How Temperature And Humidity Levels Correlate

Humidity is simply the ratio of the amount of vapor contained in the air. When the temperature is high, the air holds more water than when it’s cool. That is the reason why it’s encouraged to allow free circulation of air to extract warm air from the plants growing room. Cool air will have less water compared to warm water.

When moisture in the warm air increases to about 90-100%, the air cannot hold more moisture. The moisture condenses and falls as droplets of rain, fog, or morning dew, which isn’t good for our plant. Such a scenario, when the temperature is 30°C and humidity is 33-37%, then suddenly the temperature lowers to about 10°C, humidity level increases to 100%. This can be fatal for cannabis during the late period of its flowering phase.

As you decide the amount of temperature your plant needs, it is also necessary to be keen on humidity. It would be best if you had a good thermometer and hygrometer to help you with measuring temperature and humidity.

Humidity has to be monitored to avoid:

  • Obstruction of plant oxygen intake
  • Bud mold formation
  • Discoloring of leaves
  • Drooping of leaves
  • Nutrients intake problems

Monitoring of right temperature and humidity makes the plant grow healthy, strong, and have a dense leafy bud. As the temperature increase also the humidity increases. Due to this correlation between temperature and humidity, it’s easy to monitor and control both conditions.

Humidity Levels And Temperature For Different Phases Of Growth

1. Temperature and Humidity For Germination Phase

This is the earliest and crucial stage for the seedlings. The seeds here are prone to so many challenges, such as pests and disease, rotting, and they need proper monitoring.

Using the indoors method for the germination of the seedling will always give you more options for regulating and monitoring temperature and humidity. Still, it is possible to control outdoor conditions, but they always vary due to climatic conditions, which is the determining factor. The seed will require a temperature of 20-26°C for them to break dormancy and start germinating. Warmth is a condition necessary for seeds to germinate. Seeds for germination should have been soaked in water or a wet paper towel to reduce the time taken to break seed dormancy.

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Immediately after the seedlings have sprouted, they have to be transplanted in large spaces like the auto-flowering strains. For young cannabis plants, the conditions should have an optimized temperature, high humidity, and free airflow. Humidity should be 65-70%. The presence of high humidity allows the seedlings to take in water through their tiny leaves since the roots system is still developing.

If you choose to use greenhouses, temperature monitoring is crucial since high temperatures may cause sweltering and humidity to be closely monitored. If seeds lack enough moisture, they won’t germinate, and young seedlings plant will wither and die. You can remedy this by employing proper watering of plants.

2. Temperature And Humidity For Vegetative Phase

The vegetative stage is a stage where the plant starts having its well-developed root system and leaf shapes. The plant has grown strong enough to cope with adverse temperatures and develops a more immune system. Again, the plant will require more light but with a low level of humidity of about 40-65% (reducing by 5% each week). Adjust temperature to about 30°C. This condition will ensure proper metabolic processes and development of plant

The temperature can be increased since the plant can be able to absorb more water through its established root system. Excess water is taken out through transpiration that eventually cools the plants. If you notice the formation of water droplets on leaves, there is a high presence of humidity levels.

3. Best Humidity And Temperature For The Flowering Phase

At early flowering of the cannabis plants, lights should be 20-26 °C and maintain low humidity levels. The temperature of 20-26 °C should be maintained to prevent terpenes burning out from buds. This makes your plant produce enriched, potent flowers, which are good for great yields.

The humidity levels have to be lowered to 40-50% since much water during bud development is not needed. Low humidity encourages the development of resin and higher terpenes levels hence more aromatic and flavored product. Furthermore, low humidity is required to prevent the formation of molds and fungus in the bud.

4. Best Humidity And Temperature For Late Flowering

This is during the last 4 weeks of the plant after its maturity. During this period, careful temperature and humidity monitoring is done since slight mistakes can adversely affect the quality and quantity of yields.

Humidity levels are encouraged of 30-40% to improve the plant’s potency, flavor, and aroma. A temperature of 18-24°C is needed. Alter the temperature by lowering the daytime temperature and increasing night temperatures.

How To Adjust Temperature And Humidity

It’s a challenge to keep optimal conditions for the whole life cycle of plants. However, I can do some practices that can help to adjust these conditions to the required one.

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Temperatures and Medical Cannabis Growing: From Seedling to Harvest

The marijuana industry created an estimated $34 billion economic impact in 2018. Legal sales of marijuana are expected to increase from $10 billion in 2018 to $20 billion by 2022, according to the Marijuana Business Fact Book. This means that more and more legal growers (under strict governmental regulations) will be on the American horizon seeking the best indoor growing practices. Temperature and humidity monitoring are essential for growing healthy cannabis plants throughout the entire life of the plant…seedling to harvest.

What’s the Difference Between Temperatures and Humidity Levels?

Temperature and humidity levels interact and are very similar and are closely related to one another. Humidity is the measure of how much humidity is actually being held in the air. Relative humidity (RH) which is one way to measure humidity levels, is how much water is in the air compared to the maximum amount of water that can be held in the air at that temperature. The premise is that warm air holds more water vapor than cold air so it is important to get the warmest air in the environment. It is necessary to extract the warmest air from the growing environment while allowing cool air to enter. The warm air alone has way too much vapor for ideal growing conditions.

Horticulturalists know that the key to success in any growing plant is understanding the lifecycle of the plant. This is also true with growing cannabis. Throughout every stage of growth, cannabis plants will have a constant need for water which the amounts will fluctuate with the humidity. When the humidity is high, plants use their leaves to absorb moisture from the air which results in less water drawn from their roots. On the other hand, when the humidity is low, cannabis plants will take more water through their roots.

Monitoring and having the right humidity encourages strong, healthy, nutrient-dense leafy plants with optimal growth.

Humidity levels must be monitored to prevent:

1. Bud Mold/Rot: A condition when the inside of the plant is taken over by mold. When this happens the buds are unusable.

2. White Powder Mildew: White Powder Mildew (WPM) is a rapidly reproducing fungal disease resulting in a white powder or mildew covering the plant. If caught early enough, it can be prevented, if not the plant will become unusable.

3. Nutrient Problems: If a cannabis plant takes in too many nutrients at once the leaves will turn yellow and the tips will look burnt, called nutrient burn or nute burn.

4. Slowed Growth: If humidity levels are not optimal for the growth stage, they don’t grow as fast as they could. Younger cannabis plants grow better in higher humidity than more mature plants.

So, the next question is how do you measure the ideal levels?

Cannabis Temperature Monitoring In All Stages of Growth

There are four stages or periods of cannabis growing, all requiring different temperature and humidity levels. They are seedling, vegetation, flowering, and late flowering. Experts recommend monitoring levels throughout all four stages using a digital thermometer and a digital hygrometer that include a memory feature so history can be reviewed. The four stages and what they require are:

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1. Seedling Stage: Seedlings or clones, little cut-off pieces from a parent plant that needs to develop roots, require high humidity levels between 65 and 70 percent. These high humidity levels are needed because the root system is not established and humidity allows water intake through the plants’ leaves. Young growing cannabis plants prefer temperatures between 75 and 80 degrees Fahrenheit. Anything above 80 degrees Fahrenheit is not recommended.

2. Vegetation Period: This is the stage that cannabis starts developing its renowned leaf shape. It is important to note that light exposure is a very important part of this stage. The number of humidity levels should be lowered by five percent each week throughout the vegetation period. The temperature can be increased, too because roots absorb more water and evaporate through the plants’ leaves. Humidity levels should be before 40 and 70 percent. If wet spots are forming on the leaves, humidity levels are too high.

3. Flowering Plants: The humidity levels of cannabis plants at the beginning of the flowering stage should be lowered to 40 to 50 percent. At this stage, the plants have created a robust root system to meet their water needs. They still absorb water through the leaves. A lower humidity level is required to prevent mold and mildew from forming. Note that mold and mildew infect the plant from the inside the buds, so it isn’t visible at first.

4. Late Flowering Period: This period lasts anywhere between six and 12 weeks and when plants mature. During this time careful temperature and humidity monitoring are necessary. It is recommended that humidity levels be lowered between 30 and 40 percent to improve the yield, flavor, and appearance of the plant. Temperatures can range between 70 and 80 degrees Fahrenheit.

Tips To Adjust Temperature and Humidity for Cannabis Growing

It can be difficult to keep humidity and temperature levels at the right balance throughout the plants’ life cycle. Keep in mind that warm air retains more water than cold air and that relative humidity and temperature interact to create the perfect balance. The following are hands-on tips for adjusting these levels but note that there is technology available in the SaaS Cloud that will wirelessly do the work for you.

Tips to Lower Humidity and Temperature:

  1. Increase fresh, cool air in the growing area
  2. Water plants right when lights are turned on in the growing area
  3. Add a dehumidifier to regulate humidity in the growing area

Tips to Increase Humidity and Temperature

  1. Keep the soil surface moist
  2. Surround the room with moist towels and open containers of water
  3. Use a humidifier to constantly add moisture to the room

It is difficult to be present for the entire life cycle of a cannabis plant. There are more innovative and technological methods for monitoring temperature and humidity levels. Contact SensoScientific for a free trial and to learn more about the most advanced wireless monitoring solution available for cannabis temperature monitoring.