How to germinate cannabis seeds
Germination is the process in which a new plant begins to grow from a seed. Also referred to as “popping,” germination is the very first step in starting your cannabis garden.
Cannabis seeds can be acquired from an array of sources and can vary in quality. For more info on how to buy marijuana seeds, check out our Guide to buying cannabis seeds.
When acquiring seeds, you want to make sure they are matured and that they appear dark brown with lighter accents and a hard feel. You don’t want a seed that feels fresh and looks green, which indicates that the seed hasn’t reached full maturity.
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Once you have your cannabis seeds, make sure you have the space necessary to allow your plants to grow and be healthy. Don’t pop seeds when you are unsure of your grow space, time availability, or intention with your garden.
Check out these additional resources for more info on cannabis seeds:
What’s the best way to germinate cannabis seeds?
Cannabis seeds require three things to germinate: water, heat, and air. Because of this, there are many methods to germinate your seeds. The most common and simplest method involves the use of paper towels saturated in water.
For this method you will need:
- Two clean plates
- Paper towels
Take four sheets of paper towels and soak them with distilled water. The sheets should be soaked but shouldn’t have excess water running off.
Take two of the paper towels and place them on a plate. Then, place the cannabis seeds at least an inch apart from each other and cover them with the remaining two sheets of water-soaked paper towels.
To create a dark, protected space, take another plate and flip it over to cover the seeds (like a dome).
Make sure the area they’re kept in is warm, somewhere between 70-90°F.
After these steps have been completed, it’s time to wait. You can check the paper towels to make sure they’re still saturated, and if they seem to be losing their moisture, you can apply more water to keep the seeds happy.
Some seeds germinate very rapidly while others can take several days. You know a seed has germinated once the seed splits and a single sprout appears.
This is the taproot, which will become the main stem of the plant, and seeing it is a sign of successful germination. It’s important to keep this area sterile, so don’t touch the seed or taproot as the seed begins to split.
Transplanting germinated cannabis seeds
Once you see the taproot, it’s time to transfer your germinated seed into its growing medium. Small 2-inch pots are a good place to start.
Fill the pots with loose, airy potting soil and poke a hole in the middle about a quarter-inch down using a pen or pencil.
To transfer the seed, use a pair of tweezers to gently pick it up, then drop the seed in the hole with the taproot facing down. Lightly cover it with soil.
Next, you’ll need to water the soil. Initially, use a spray bottle to provide moisture without over-saturating the soil. You want to give the seed water, but over-watering can suffocate and kill the delicate sprout.
Pay attention to the temperature and the moisture level of the soil to keep the seed happy, and within a week or so you should see a seedling begin to grow from the soil.
Germinating seeds doesn’t always go as planned. Some seeds will be duds. Others will be slow and take longer to sprout. But some will pop quickly and grow rapidly.
This is the beauty of seeds—often, you can tell which plants or genetics will thrive right from the get-go. This will help you determine which plants you want to take cuttings from for clones and which to breed with other strong plants to create a seed bank of your own.
Follow these simple steps on the best way to properly germinate your cannabis seeds, and find out how to transplant the seeds to soil after germination.
Seed Magic: How to germinate seeds in one day (with printable)
Inside: germinate seeds in one day and more spring seed inspiration for kids. Free printable.
Do you want to demonstrate to your kids how seeds turn into plants but worry that they don’t have the required attention span to follow the project to the end? We have the solution! With our marvelous technique, the seeds germinate in one day. And you have tiny plants in as little as 2-3 days (depending on the type of plant).
I find that kids are naturally curious about seeds, plants, and how things grow. The right books make them even more excited about the topic. We have many favorite seed books, but every spring we are especially inspired by Seed Magic. In this story, a young girl’s life is changed when she is given seeds to grow a garden under her window.
What you need
A plate that can fit inside a gallon bag
A gallon bag/Cling Wrap
A small toy or bottle cap to lift the wrap/bag off the seeds
Note: If you prefer to avoid plastic, you can use a glass container with a lid instead, but it will take longer because kids will want to peek inside. Even relatively clear lids like ours don’t allow a clear view, and kids end up opening them multiple times a day to get a better look, slowing down the germination. For quick results use a plate and a gallon bag method because it allows kids to observe the seeds all day long without disturbing the seeds.
Related: Looking for more science ideas? Check out Kid Minds Science Page.
Germinate Seeds in One Day
What to do
- Soak a paper towel under running water and squeeze most the water out of the towel. (So it will be wet, but not dripping).
- Spread the towel on the plate folded in half.
- Place seeds on the towel.
- If you are planting different seeds, write down on the gallon bag/Cling Wrap where each is located.
- Slide the plate into the bag.
- Place a little something (we used our popsicle mold cover) in the middle of the plate to lift the plastic off the seeds by half an inch.
- Voila! Get out your clocks and start counting down the hours. I find that seeds and planting are a great way to teach kids about time.
Note: All seeds are not created equal. From our experiments, we found that radish germinates in less than 24 hours and can be planted on a second/third day. Russian Kale and beets are close behind. Tomatoes take a few days and tomatillos even longer. If you want to plant flowers, you will get quick results with Cypress Pennata Red. It’s a beautiful red climbing flower that I plant every summer at the bottom of our fence (and within a month I’m looking at a sea of waving greens and reds). Some other flowers we had success with are cornflowers and marigolds.
Use our Seed Observation Journal to record your observations. You can access all of our Printables in the Subscribers-only Library of Resources. To subscribe click here.
Next morning (in less than 24 hours)
Here is a pic of radish. Can you believe it!
And here is Russian Kale
It’s getting there.
I peeked at our seeds in the morning and realized that if we didn’t plant them right away, they would grow into the paper towel. Once the seeds grow into the paper towel you have to plant them together. Pulling the plant out of the paper towel, however gently, usually damages it beyond recovery.
Are you wondering why we didn’t plant our tiny germinated seeds into bigger pots? We actually did plant half of our seeds into bigger pots, and they are still so tiny we can barely see them. I think there might be two reasons for this result. First, it’s easier for kids to take care of egg cartons. The kids put a drop of water in each section every day. On the other hand, big pots were always either completely drenched or dry as toast. And second, we only have space for one or the other in front of our sunny kitchen windows. Since the place was occupied by the plants in egg cartons, the big pots had to be in the shade. My guess is that they didn’t like it!
Our plants are 9 inches tall!
The kind of soil that goes into planting radishes is very important. We have tried a variety of soil mixes, and we can definitely taste the difference!
I will update you on Instagram when we eat our first radish of the year.
Disclaimer: This post contains an Amazon affiliate link.
This method is also great if you are serious about gardening. No more waiting for weeks to see if something will grow. With this approach, you know if seeds are viable in the shortest amount of time.
Looking for more science ideas?
This month we were invited to participate in the Storybook Science Series hosted by Inspirational Laboratories. If you want to see more amazing science inspiration from wonderful bloggers, click here.
Germinate seeds in one day and more spring seed inspiration. Free Printable and lots of photos. Great for elementary grades and older kids too.