Best Temp And Humidity For Germinating Weed Seeds

Learn how to successfully germinate your precious cannabis seeds every-time with this simple, easy to follow guide. A must read for all beginners. Our guide will go over the importance of Seedling Temperature and Humidity and why that is important for growing marijuana seeds.

How to germinate cannabis seeds

When germinating cannabis seeds there are a few factors that play an important role. Cannabis seeds need humidity and warmth to sprout. A temperature between 20 and 25 degrees Celsius is ideal. Also besides that, we recommended that you leave the seeds in peace.

A glass of water

Step 1

Place your seeds in a glass of sterilised water, the water temperature should be around 20 – 25 degrees Celsius. Gently push the seeds with your fingertip below the surface of the water and leave the seeds fo float. After 2 – 4 hours, your seeds should have sunk to the bottom of the glass, if not, Gently push the seeds again, they should fall to the bottom. Within 24 / 48 hours, your seeds will have small roots and be ready for the next stage.

Cotton pads – Paper towels

Step 2

Place the seed between 2 wet layers of your chosen material. Using this method, the water will evaporate quickly so it is best to create an environment where condensation can take place. You can do so by placing 2 plates on top of each other with the top one upside down for example. Make sure to check the humidity twice-daily! The material should be humid, not wet!
When the root is longer than 2 – 3cm, its ready for planting.

In soil

Step 3

Choose the size of pot that you will need and fill with a quality soil of your choice. Place your finger into the soil making a small hole in the middle. Carefully transplant the seedling into the soil with the root facing downwards. The seed head should just be covered up by the soil. Wet the soil carefully. Make sure it is wet enough for the seedling to continue growing. Check regularly. The seedling will require 18 hours of light a day in the growing (vegitation) stage.

Seed Storage

We recommend storing your seeds in an airtight plastic bag or container in the fridge. The seeds will stay fresh for years when stored this way.

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How to germinate cannabis seeds every time

Learn how to germinate your cannabis seeds successfully every time in our easy to follow guide. Read more

What if my seeds do not germinate?

If your seeds do not germinate for some reason please contact [email protected] for a *free replacement.
*This only applies to seeds bought from this website.”

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.

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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.

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.

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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.