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.
How Long Does it Take For a Seed to Germinate
It’s the most important time of your growing cycle, often overlooked in favor of other stages like vegetation and flowers, but germination is where the magic really happens.
In reality, without a successful way to germinate seeds, you’ll have nothing to work with.
Mastering the art of germination is one of the first steps in your cultivation experience, and there are so many germination methods to pick from that it’s difficult to know where to start. Fortunately, we’ve got everything you need to know about germinating seeds from all sorts of indoor plants from cannabis to flowers.
What Is Germination?
Let’s get the jargon out the way first. Simply put, germination is the development or growth of a plant from a seed or spore, usually after a period of dormancy (like if the seeds have been sitting in a seed bank). It’s also known less scientifically as sprouting. During this process, your seed will crack open and sprout a single root, known as a tap root, before beginning the growth stages above the soil.
Seed Germination Process
Success in seed germination is actually quite straightforward as there are only three factors that really matter: water, temperature, and air.
All seeds will naturally seek out water. Water helps the seeds expand and break their shells, particularly if seeds are dry from being dormant for some time. Usually, damp environments are what seeds thrive in. If they have too much water, they’ll get waterlogged which stops them from receiving enough oxygen. However, if seeds are too dry, they won’t get the levels of water they need to sprout the tap root.
As well as water, temperature affects seed germination. In a natural outdoor environment with the changing seasons, the temperature will indicate to the seed that it’s the right time of year to grow. If your temperature is too low, your seed will stay dormant. While if the temperature is too high, your seed will suffer from heat stress or seed aging – both of which can cause weaker plants in the long run even if germination is successful. For most plants, springtime temperatures are usually what to aim for in germination stages (22-24ºC or 68-72ºF).
Last but by no means least, oxygen. Just like mature plants, seeds need oxygen to survive. As we mentioned above, the issue with water logging seeds isn’t really too much moisture, but a lack of oxygen. This isn’t the only way growers might deprive their seeds of oxygen. Other common factors limiting oxygen intake include sowing seeds too deep into the soil or a heavily compacted growing medium.
All this being said, if these simple conditions are met, most seeds will germinate. Depending on your germination method, you’ll know if this has been successful as you’ll be able to see a small, white root sprout from the bottom of the seed.
There’s a reason we said most seeds and not all. It’s a really common misconception that all seeds will germinate if given the right environmental conditions. Some growers will swear by a certain germination method for a 100% germination rate, while some seed banks will claim a 100% germination rate from their products. It’s not true, and in reality, all this comes down to the germination rate of your chosen species. This refers to what percentage of seeds are likely to germinate out of a given amount planted.
Ignoring the environmental factors listed above, germination rate is most influenced by how long the seed has been dormant. The seeds with the highest germination rate will be those planted within a year of being harvested from the mother plant.
With all this being said, plants are natural, living things and like all living things, they’re complicated. You can do everything perfectly, meet every environmental requirement and some seeds just won’t germinate. It’s a natural part of growing and certainly not something to be disheartened by if you’re new to growing.
If you’re growing cannabis plants, you’re in luck. Cannabis seeds germinate easily and generally have a high germination rate. Some strains may certainly be slightly trickier to grow than others, but this usually falls more into the vegetation and flowering stages than germination.
How Long to Germinate Cannabis Seeds
Depending on the seed and the environment, a general rule of thumb is you should see signs of germination within 3 to 5 days of moisture being introduced to the seed and, if your germination method allows, you will be able to see a white root tip within this time frame. If you’re using soil in your germination method, as you won’t be able to see the root appear, you won’t see a sprout until roughly 7 to 10 days since first beginning your germination process.
It’s worth highlighting, as we have previously, that environment is everything in growing cannabis, including germination, so your environment may move these estimated time frames around slightly. As well as this, whichever strain you’ve chosen to grow will affect the length of time it takes to germinate. For example, sativa seeds usually take longer to germinate than indica seeds.
How Long to Germinate Seeds of Other Indoor Plants?
If you’re growing something else entirely, the length of time to germinate can fluctuate a lot further than the time frames above, from less than a week all the way up to an entire month. While all seeds have the same three basic needs to germinate successfully, the amounts of water and temperature may vary.
For indoor plants like flowers and herbs, many follow the usual 7 to 10 day germination period, but it’s well worth researching the exact species you’re growing to inform yourself of the exact length of time, as well as any specific temperature or water requirements your seed might need to thrive. For more unusual or adventurous indoor plants like ghost peppers, these seeds can take an entire month to germinate, so make sure to do your research for these as well so you’re not expecting to see signs of life too quickly.
Common Germination Problems
If you’re struggling with germination, don’t worry. It’s a common problem for growers but fortunately, most issues are quite easily rectified with small environmental adjustments. Some of the most common problems include:
- Letting the seeds or soil dry out
- Leaving seeds to germinate for too long
- Germinating the seed directly in soil
- Incorrect temperature or humidity
- Planting seeds at the incorrect depth
- Planting too many seeds
You can find excellent solutions and tips for germination in our incredible online growers’ community, where our experts and experienced growers will be happy to help you solve everything from common problems to complete conundrums.
Good Tips For Germination
Exact advice will depend on which germination method you’ve chosen, but we’ve found there are two simple tips that work for all germination methods.
Firstly, clean hands. We carry loads of dirt, oils, and other gunk on our hands. If you must touch the seed when planting it, make sure you’ve washed your hands first. However, if possible, it’s preferable to pour the seed straight from the container it came in directly into your chosen container for your germination stage to eliminate this possible contamination.
Secondly, use distilled water or a reverse osmosis system for the best results. This ensures your water is free of contaminants and other particles that may cause issues with germination or weaker plants later in the growth cycle.
Germinate Seeds With Grobo
We have no doubt you’ve probably already read tons on the huge amount of germination methods available to pick from, like the popular paper towel method or the arguably inefficient glass of water method. Grobo actually removes the hassle from common germination methods as a do-it-all grow box. All you’ll need to start with Grobo is your chosen seed, a bucket of water, a towel, some scissors, and about 45 minutes spare.
This is because, as an automated grow box, Grobo uses the deep water culture, a hydroponic technique, to grow your plants and our advanced app to guide you through the process from start to finish. You simply add your chosen seed, pick your grow recipe in our app (from hundreds of strains available) and Grobo does the rest for you, creating the perfect environmental conditions at every stage in your plant’s life cycle. All you have to do is add water.
Let’s Get Growing
With Grobo you can grow from seeds or clones, and our state of the art grow box also reduces smell. Grobo users can expect to grow approximately 2 to 3 ounces every 3 or 4 months.
Whether you’re growing cannabis or something else entirely, you can learn everything you need to know about how easy it is to grow with Grobo on our site and we’ve got tons of educational videos on our YouTube channel, including how to germinate seeds with Grobo.
Learn how germination rates differ from cannabis to cardamom in this introduction to germination. Can seeds really start growing well, 100% of the time?