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How to germinate cannabis seeds

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How to germinate cannabis seeds

How to germinate cannabis seeds

Seeds. What a gift for our planet! From such a small thing, we can grow our own food, use it to build our house, and in our case, even medicine! So yes, really, it would seem logical to make sure that as many seeds as possible are born. In this post, our contributor Light Addict will tell you how to germinate cannabis seeds correctly.

That said, let’s look at how compost teas can be used as a natural inoculant to help remove the risk of unwanted bacteria or pathogens encountered during cannabis germination / cultivation process. For this you will need to add beneficial bacteria and mycorrhizal fungi in the process via compost teas used for pre-soaking your plugs, rockwool cubes, growing medium etc. or during hydration of the culture medium just after germination. These beneficial bacteria and mycorrhizal fungi colonize the root zone creating a symbiotic relationship with the roots of cannabis plantsleading to improved nutrient/water uptake levels, but also overall plant health and stress resistance.

The environment

Currently, a cannabis seed only needs 3 simple things to germinate:

  • Humidity
  • Heat
  • Brightness

So why are there so many different methods floating around? Simply because there are many different ways to give your cannabis seeds these 3 basic environmental needs. Thus, by following these fundamental provisions, what are the best techniques to get your cannabis seeds to germinate well? As for humidity, a medium humidity level is best, never soaking it, (except in the water germination method). The suitable temperature is around 23 to 26ºC / 75 to 80ºF. And finally, the luminosity; the total deprivation of light is not essential. However, since it is so easy to obtain, it is the option most of us choose. These three requirements, while maintaining consistent levels can also promote success.

Methods for germinating cannabis seeds

Paper napkins

One of the oldest and known methods used by small-scale growers to germinate cannabis seeds, is the paper towel method. Using paper towels, we create a seed bed for the seeds. Place this seedbed inside an appropriately sized opaque container, then moisten it with spray water. Place your seeds on top, before covering the whole thing with more paper and spraying water again. Close your container, then place it in a warm place to wait for germination. Once the roots are out, simply plant them in your chosen growing medium.

how to germinate cannabis seeds - paper towel

Soaking in water

There is no simpler method than this, although of course they are only really suitable for small-scale growers. Place your seeds in a glass shoot, then fill it ¾ full with water, before placing your glass in a warm, dark place. You may need to come back after a few hours to make sure there are no seeds left floating on the surface. If some persist, give a small blow so that they go down to the bottom of the glass. Wait again until the root has shown, before planting them in the medium. However, keep in mind that: if germination has not started within 36 hours, remove the seeds from the water and place them in a paper towel to prevent your seeds from drowning.

how to germinate cannabis seeds - water soak

Plugs, rockwool cubes and peat pellets

These 3 different starter media share the same basic seed germination process and are all suitable for any size production, although some require a little more care and attention when preparing them.

how to germinate cannabis seeds - cube pellets


Versatility is key with this germinator, as it is suitable for use in any type of medium or cultivation method used during the growing process. The plugs have been specially designed for make the germination process simple and successful. Their composition maintains perfectly adapted humidity levels. One advantage when talking about plugs is that they are usually made from compost of decomposed organic matter. However, we advise you to always check the components present in your product. Take your seed and insert it into the plug hole. Then, tear a small piece of peat from one of the corners or the bottom and fill the hole so as to completely cover the seed. Then place your plugs in your germination space or propagator, always providing a constant light source. Remember to control humidity levels while waiting for germination.

rockwool cubes

WARNING. Rock wool is a harmful material. A bit like fiberglass, because the dust that comes out of it can sometimes be breathed in, and then stay in your lungs. In addition, it can sometimes be irritating and require the wearing of gloves and a protective mask during handling. Rockwool is an inert medium, made for most cultivation practices, which means that it is essential to dip your cubes in water at pH adjusted before use. Once soaked, allow to drain, then drop your seed into the hole, and finally tear off part of the corner of your cube and use it to cover the seeds and hide them from light. Then place your cubes in your propagator under your chosen light source and wait.

Peat pellets

Peat pellets look very similar in appearance to plugs once they increase in size. The main problem with peat pellets is that it is not a sustainable or environmentally friendly material. Peat pellets are sold dried, which is why it will be necessary to soak them. When ready, they will have grown to more than double their original size. Then all you have to do is make your own small hole in the top part of the pellet, before depositing your seed and then covering it with another torn part of your pellet.

The seed, directly in the middle

Take your pot filled with your chosen medium and water it an hour before (pH, if any, as above ground). Make a small hole, the ideal depth is 12 to 19 cm, place your seed and then cover everything. Finally place your pot under the light source and wait. As with the other methods, keep a watchful eye on humidity levels. Although we strive to maintain consistent humidity levels, try not to over water the medium as this can sometimes cause germination failure. Also take into consideration the food requirements for new seedlings: nutrient supply is not necessary during the first week of a young plant’s life, even if you use an inert medium such as coco or cotton wool. rock. Indeed, this is due to the fact that the seed will use its own energy resources.

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