You will need to invest in a few pieces of unique equipment, but by using stone wool blocks, you can create a perfect utopia for germinating cannabis seeds. Soak the stone wool blocks in the same way you would a soil medium. The wool will retain the moisture and prevent the need to water during the early stages of germination. After the wool blocks are soaked, stick them in a plastic tray that also has a lid. Large cake tubs are ideal.
The dome of the plastic container will create your seeds’ own mini tropical climate. If you then place all the components in a temperature-controlled cupboard, you will have created a self-perpetuating supply of moisture—no need to touch the seeds again until they are ready to be transferred to your final growing medium as a young seedling. Using the stone wool block method, your seeds should germinate in one to two days.
Probably one of the most common methods of germination. The kitchen towel method comes in several iterations. Some growers use cotton wool pads or absorbent pieces of paper. For this guide, we will be using kitchen towel as it is readily available and holds moisture relatively well.
PLANTING DIRECTLY INTO SOIL
Timescales can vary, as it all depends on how ideal your germination environment is (see the golden rules above). Even the worst grower could make a seed germinate, but it may take a few weeks and, of course, increases the risk of a weaker plant.
The soil pots will need small holes (roughly 10–15mm deep) for the newly germinated seeds to be placed into. Once the seeds are secure, you will want to place a fluorescent light 13–15cm (5–6 inches) away to encourage growth. Finally, don’t risk overwatering your seeds at this early stage. Use a plant mister to make sure they stay damp but not soaking wet.
Your growing pots will need to be placed in a damp climate that is within the temperature range listed under our golden rules. After 4–10 days, you should see a young seedling sprout, while the roots will have begun to develop underneath the soil. The entire plant and its soil can now be transferred to a larger pot, where normal growing routines should start.
Maintaining the ideal temperature (between 22–25°C/71–77°F) and moisture for germination is tricky. Leaving seeds out in the open environment or on a windowsill is far from ideal; a DIY climate-controlled cupboard would do a much better service. A warming mat is perfect for maintaining a constant temperature, but it doesn’t tackle the issue of moisture.
Scarification is a method used to make ridges on the seed to help water pass through, to do this properly, you will need a piece of sandpaper but you can improvise and do it with a matchbox.
Also, there isn’t the best way to germinate marijuana seeds, you can do it any way you want, as long as you keep proper conditions, your seeds will germinate.
To do this, you can fill a glass cup with water and add around 30ml of hydrogen peroxide and leave your seeds soaking for 12hs, this should do the trick.
The process of autoflower germination can take up to 10 days, in order to do everything correctly and know if everything’s going well, we need to know a little bit more about the seed.
If you are storing seeds for your next grow cycle, you need to keep them in ideal conditions.
Usually, seeds stay valid for 3 to 5 years if stored properly but with every passing year the seed germination percentage drops and it is harder and harder for you to germinate them. In time the seedling inside the seed loses its moisture and starts to shrink getting weaker and weaker up to the point that it is no longer alive and no moisture levels can’t bring it back to life.
The last stress that can damage the newly sprouted tap root or seedling itself is nutrients. For the first days and weeks of cannabis growth, you need to supply only pure water with no salts and nutrients.
After selecting the best autoflowering seeds you have two options: putting them right in soil or germinating on wet paper towels. In this guide, I will show the second method.
This method is not going to work 100% of the time and in most cases, you won’t get even 50% success rates but you can apply this method as the last resort if that seed doesn’t sprout naturally.
Seeds will also pop faster than if they were grown right in the growing medium!
The process of germinating old autoflower seeds is similar to regular seed germination, but you need to let them soak in water for a while so that the seed shell can soften and moisture can get inside the seed giving energy to cells to crack that shell and push out the tap root.
The last method is just taking a small knife or scalpel and cutting around the seed till the seed shell breaks off, but you should be very careful not to damage the seedling if it is still alive.