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Germination Guide

Germination Guide - Cannabis SeedsGerminating cannabis seeds is a crucial step in the cultivation process and with the correct approach, you can make sure your plants have the most incredible possible start in life. With the right temperature, moisture, and darkness all working in unison, you’ll be able to initiate the root growth necessary for cannabis plants to thrive.

Germination is the process in which a seed sprouts and begins to grow. In this guide, we’ll take you through the basics of germinating cannabis seeds and provide you with all of the information you need to get started.

So, let’s get started!

Germination Temperature

The most important thing to remember is that the optimal temperature for germination should be between 71-77°F (22-25°C). If the temperature drops below this, the chances of germination success lower significantly. Temperatures that are too high can also be detrimental, potentially killing the seedling. It’s important to keep your seeds in an environment with a consistent temperature to ensure the best possible results.

Germination Humidity

When it comes to germinating cannabis seeds, humidity is just as important as temperature. The ideal relative humidity level should be between 70-90%. Too little humidity can cause the seed coat to dry out too quickly, preventing the embryo from emerging. On the other hand, too much humidity can cause the seed coat to stay wet and lead to root rot. It is important to ensure that the growth environment is moist but not wet. To test for moisture levels, use a hygrometer to measure the relative humidity in your grow space.

Germination Time

When it comes to germinating cannabis seeds, timing is everything. Depending on the environment, cannabis seeds can take anywhere from 12-36 hours to germinate. This time frame could be affected by factors such as temperature, moisture, and darkness.


Darkness is also crucial in the germination process. Seeds need to be placed in a dark environment that is free from light sources like lamps or windows for them to successfully germinate. Covering the seeds with a cloth or paper towel is a good way to ensure darkness. Once the seedlings have emerged, they should be exposed to moderate lighting as soon as possible.

Germination Methods

Now that you know about the optimal settings for germination, let’s look at some of the different methods for germinating cannabis seeds. There are numerous strategies available with varying levels of success and advantages, so it’s important to understand each before deciding on which one is right for you.

Glass of Water

One of the simplest ways to germinate cannabis seeds is by using a glass of water. All you need to do is fill a glass halfway with lukewarm water (around 71°F or 22°C) and drop in your seeds. After 3-5 days you should notice small white taproots starting to form – these are signs that your seeds are germinating.

Once the taproots appear, carefully move your seedlings from the water to planting containers. It’s important to make small holes (around 1/4 inch deep) into the surface of the container before inserting the newly germinated seedlings.

Wet Paper Towel

The wet paper towel method is quite popular among cannabis growers. This involves two moist kitchen paper towels that are placed on a flat surface. Place your seeds a few millimeters apart onto one of the towels and then cover them with the second towel.

When the white taproots emerge, gently transfer the seeds to planting containers. Just like with the glass of water method, make sure to make small holes (around 1/4 inch deep) into the surface before inserting the seeds.

Direct Planting In Soil

If you’re looking for a strategy that does not require transferring your seedlings, then directly planting in soil may be a good option for you. Start by partially filling pots with moistened premium-quality soil and making a 1⁄4 inch deep hole for each seed.

Once you’ve inserted your seeds, lightly cover them with soil and try not to press down too hard. To keep the growing media moist, lightly spray the area where you planted the seed with water (you can also add a root stimulant if desired).

Now that your seeds have been planted, place them in a moist area with temperatures ranging between 71-77°F (22-25°C). After 3-10 days, you should see some growth and formation of roots beneath the soil. Once this happens, carefully transfer the entire plant and earth to a larger container.

Rockwool Cubes

Rockwool cubes are an ideal option if you’re looking for an easy yet effective way to germinate cannabis seeds. All you need to do is soak the rockwool cubes as you would a soil medium and place them in a plastic tray with a cover. To create an autonomous source of moisture, place everything in a temperature-controlled cabinet and wait for two to three days for your seedlings to sprout.

Once your seedlings are ready to be transplanted, check that their root systems aren’t covering up more than half of the wool cube – if they are, it’s time for them to move into their new home.

Peat and Coir Plugs

Peat and coir plugs offer an excellent combination of aeration and water retention – making them perfect for germinating cannabis seeds. Start by placing a single seed into each plug and placing them on a propagation tray. Sprinkle some water over the plugs and cover them with a transparent plastic cover (making sure temperatures remain between 71-77°F or 22-25°C).

After 3-5 days, roots should start appearing through the bottom of the plugs – meaning your seedlings are now ready to be transferred into their final growth medium.

Light for Seedlings

When your seedlings are in their early stages, it’s important to make sure they receive enough light without being exposed to too much at once. Fluorescent or CFL grow lamps are usually enough light for germinating cannabis seeds and should be placed around 6 inches away from your plants. When your plants produce their first true leaves (which should have serrated edges) you can adjust your lamps as close as 2 inches away from them.


And there you have it! Now that you know how to properly germinate cannabis seeds, all that’s left is for you to get out there and start growing! Good luck!

With these simple guidelines in mind, you’ll be able to ensure your plants have a great start in life and achieve a successful harvest later on down the line!