After another two days, they should have a pair of leaves then continue growing for another two weeks until they begin the vegetation period. If you are concerned that the seed cover is still on the leaf or concerned about how long the cannabis seed germination will still take, just remember the more warmth and moisture (not dampness) will accelerate the process for the Cannabis seeds to germinate and within 24 to 48 hours it should be completely out of its shell.
If you’re one of those people that have to have control over everything you might find yourself wondering how long cannabis seeds germinate. The long and short of it is that it usually takes 24 to 48 hours for the cannabis seeds to germinate. If they are placed somewhere moist, warm and dark, like a cupboard or in a propagator. These are ideal places for the Cannabis seeds to germinate and they will crack out of their protective shells.
You could also find our FAQ Submission Where To Find Cannabis Seeds? useful.
So now you know how long cannabis seeds germinate, what will happen after?
Some people will begin to provide fluorescent or other types of lighting already at this stage, but technically this is not necessary until you see the plant sprouting from the dirt.
Another commonly used method for marijuana seed germination is using paper towel or cotton pads. The benefit here is that germination process is very easy to keep an eye on, it tends to be fairly safe, and is very easy to get started. Now, be sure to pick good cotton pads or paper towels, ones that are smooth.
You don’t want to use overly porous materials here because once the roots start to come out of the seed, you run the risk of having them grow into the porous paper towel. The result here will be that the roots are hard to remove from the paper towel, potentially damaging them before you get the chance to transfer them into good potting soil.
Don’t Forget Plant Sprayers
Most people would say that placing your seeds in water for germination provides them with both too much water and light, thus potentially drowning and killing them. Although, depending on the seeds you have, it can work.
However, there is really no way to tell until you actually do it, because all seeds are different. Sometimes they might all germinate just fine, and sometimes you might get a batch where none germinate.
Here, most people will choose to place the paper towel in a plastic and sealable bag. Don’t worry, there will be enough air in there for a few days. The good part about this is that you can keep an eye on the process. Yes, you can open up the bag, unfold the paper towels, and check to see if the germination process has started.
Once the roots have sprouted, and are about 4 mm long, you then have to place them into soil. Do not place them into soil if they are shorter than 2 mm, and don’t wait until the roots are longer than 5 mm, as the roots will start to grow into the paper towels and cause you trouble.
Peat Pods: Rule of thumb here from experience is about the same as the paper towel; 3-7 days.
Water: usually within 24-48 hours the seeds should sprout in water. But do not leave seeds in the water longer than one week.
Direct Sow In Soil: For whatever reason directly sowing a marijuana seed in soil seems to take the longest. I’m sure it depends on how much soil is actually covering the seed. Sprouts usually can be seen in about 7-10 days.
Peat Pod method
Cannabis seeds seem to do best when stored at a temperature around 70-73 degrees Fahrenheit; and humidity levels between 70-90 percent.
But there are times when this method fails to work. While the simple process seems to “stump” growers; the issue may lie within the paper towel itself.
Meaning an over-saturated growing environment will likely halt the germination process. Or worse, possibly ruin any chance for the seed to develop and grow.
Generally I use the peat pods and have approximately a 90-percent success rate. However, there have been times when I’ve had to carefully dig the seeds out of the pod and use the paper towel method to get the seeds to germinate.