If you have some cannabis seeds but are not ready to plant them yet, you need to know how to store them properly. Here's our complete guide. How do you store cannabis seeds so you can use them for future use? Learn how to properly care for your seeds so you can grow the best plants. Do you know the best way to store weed seeds in the short term? Is long-term storage possible? Learn all you need to know about how to store cannabis seeds.
How to Properly Store and Preserve Cannabis Seeds [Explained]
If you don’t begin with great seeds, you can forget about producing a harvest of high-quality marijuana. A lot of growers seem to forget one simple fact: Your seeds are alive! Although cannabis seeds are fairly durable, improper storage can ruin them. If you’re paying $10-$20 a seed, losing a full batch is an expensive mistake.
Before your marijuana seeds germinate, they are in a similar state to animals when they hibernate. Like all living organisms, your seeds can die if you don’t take care of them correctly. The good news is that cannabis seeds can last for five years after harvest with proper storage.
In this guide, we outline how to store and preserve your cannabis seeds. We focus on the following:
- Insects & Pests
- Germinating old seeds
EDITOR’S CHOICE – Homegrown CannabisCo
Homegrown CannabisCo are the masters when it comes to seeds. Offering a massive variety of cannabis seeds that are well categorized, not only does this company create a resource for superb quality options including feminized seeds, it also provides extensive growing information for those looking for some support along their journey.
Keeping Light Away from Your Marijuana Seeds
You must keep your seeds in a location that is cool, dark, and dry. It is best if you keep the seeds in their original packaging. When they are exposed to temperature changes or light, cannabis seeds begin using their store of nutrients. This is a disaster because they ultimately won’t have the nutrients to germinate.
When they are exposed to temperature changes or light, cannabis seeds begin using their store of nutrients.
Make sure your seeds remain away from light, as it can directly trigger germination.
What’s the Right Storage Temperature?
The best temperature to store your cannabis seeds at is between 43- and 47-degrees Fahrenheit. The lower the temperature, the less likely your seed is to germinate unexpectedly. Experienced growers tend to have special refrigerators to store their seeds. Ideally, your fridge is a no-frost model. If you can place the seeds in the fruit and vegetable section, that is even better.
Another option is to freeze the cannabis seeds. If you go down this route, please ensure that you vacuum pack them first. Then put them in a dark container. Also, it would help if you germinated these seeds immediately once they come out of the freezer. Don’t allow them to thaw first.
What About Humidity?
Here is a quick overview of what will likely happen to cannabis seeds at different humidity levels:
Your cannabis seeds need a certain level of moisture for germination. If the humidity level gets too high, your seeds will rot in storage. An extremely low level of humidity of around 8-10% is suitable only for long-term storage. If it drops below 8%, you offer any insects present in the seeds the chance to become active and start reproducing.
The Right Storage Options for Your Cannabis Seeds
You now understand that you must store the seeds away from direct light. We have also outlined the need for relatively low humidity and a refrigerator-level temperature. Different options are available depending on how long you intend to store the seeds.
If you only require short-term storage, a dark drawer or cupboard is sufficient. The most important thing, regardless of the duration of storage, is to avoid temperature and humidity fluctuations. Rapid variations in temperature, in particular, can destroy your seeds. If you live in a location with warm daytime temperatures and cold nights, avoid outside storage.
For short-term storage, place the seeds in a container with desiccant. Seal it, and place it in a cool, dark place.
Once you enter medium-term storage (a few months), it is time to use an airtight container. Examples include a mason jar or Ziploc bag. Place this sealed container in the fridge. Remember that opening your fridge can cause significant temperature fluctuations. As a result, it is ideal if you have a second fridge that is seldom used.
Also, you should note that modern fridges have low humidity levels. If the humidity is too low, your seeds will begin using up nutrients.
If you want to store your seeds for at least six months, use a vacuum-sealed container. You can achieve this effect by removing all the air from a Ziploc bag. There are also special vacuum-sealed containers available online. Put the sealed bag in a dark container and put it in the fridge.
You also have the option of placing the seeds in the freezer. Remember, though; you need to germinate them immediately upon removal.
A Note on Insects & Pests
Imagine paying $100+ for seeds, going to the trouble of storing them, only to find that insects ruin them. Unfortunately, all you need is one insect in a container to destroy all of your seeds. The first consideration is to avoid exposure to ultra-low humidity. However, for long-term storage, this is precisely what you are supposed to do!
One option is to spread diatomaceous earth (D.E) where you store them. This is a type of sand that has a fossilized algae base. Crucially, for our purposes, it serves as an excellent natural insecticide. Unfortunately, you shouldn’t use D.E if you plan to store your seeds in a fridge with other food.
Imagine paying $100+ for seeds, going to the trouble of storing them, only to find that insects ruin them.
It would help if you also stored your seeds as high above the ground as possible. This reduces the possibility of a pest like a rodent coming in and feasting on the seeds.
Insects and pests also thrive in dirty storage areas. As a result, you must ensure the storage area remains clean. Otherwise, you won’t just attract pests to your seeds; microbes will form and damage the seeds. Do you want to consume marijuana from contaminated seeds?
You can ‘test’ your seeds once you have removed them from storage. Place them in water. If they sink, they should be fine. However, if they float, it is more likely that they are bad seeds. You can still try to germinate, but there is a greater risk of producing poor-quality cannabis, or else the seeds fail to sprout. You can keep floaters in water for approximately 72 hours to see if they sprout a tail.
If you have old seeds not stored in ideal conditions, there are still a few ways to germinate them.
- Remove the hard ridge with a sharp knife.
- Soak the seeds in carbonated water with germination booster, fulvic acid, or hydrogen peroxide. Use room temperature water, and perform this pre-soak for at least 12 hours in a dark area.
- Scratch the tough outer shell with sandpaper. Believe it or not, this process could help warmth and moisture get inside. This process is called ‘scarring’ and should happen before you soak the seeds.
- Make a small cut into the shell as a last-ditch attempt to get it to sprout.
Final Thoughts on Storing and Preserving Cannabis Seeds
If you purchase marijuana seeds and intend to use them almost immediately, you should have no issues. Even so, it is probably best to keep them away from direct light. In the short-term, a dark cupboard is sufficient as long as the temperature and humidity are reasonable.
Once the goal is to store cannabis seeds for months rather than days or weeks, everything changes. You need an airtight container, which you should store in a fridge. Include a vacuum-sealed container if you plan to store the seeds for several months or longer.
When storing cannabis seeds, you must ensure they are not exposed to germination conditions. This means keeping them away from direct light. Also, store in 20-30% humidity (8-10% for long-term storage) and a cool temperature. Keep the environment clean to avoid pests, and consider the tips above for germinating old seeds.
How to store cannabis seeds
Want to know the best way to grow the best marijuana? Start with great seeds. But once you find the perfect strain, how do you store seeds so that you can use them for future plants? It’s not that hard; actually, you just need to keep them cold, dark, and dry. However, there are few other things that you could do to preserve your precious seeds – keep reading to learn more.
A guide to storing marijuana seeds
If you plan to grow marijuana for fun or profit, you’ll need to know how to store your seeds.
Why is storing cannabis seeds important?
Those seeds are directly related to the quality of your plants. If they are not stored correctly, when you do get around to planting them, they will not germinate. On the other hand, if you store them the right way, they are good to go indefinitely.
Some growers keep seeds for years. However, it’s common to leave a few seeds in storage for less than a year, especially when there are limits around how much you can grow at one time. There’s no reason why those extra seeds should go to waste, simply learn how to store them correctly.
Download my free Grow Bible to learn more about storing your seeds.
- Grow with my Quick Start Guide
- Discover secrets to Big Yields
- Avoid common grow mistakes
Use the right storage container
When storing cannabis seeds, the first thing to think about is your container. Do not use just any random container that you come across. The ideal container should be made of one material.
Avoid containers with a mixture of materials. An example of this would be a plastic container with a metal lid or a glass container with a plastic cover. Containers made from more than one material react differently to temperature and other changes, and this can create room for undesirable conditions to reach your stored cannabis seeds. For instance, the metal lid on a glass jar will expand at a different rate when the temperature rises, and this may allow some moisture to enter the container.
Many people suggest using plastic containers for long-term storage when asked how to store marijuana seeds, but that isn’t a great idea either. Plastic has tiny (microscopic) pores that can let air infiltrate the container and damage your seeds. If you want your seeds to last, don’t store them in a plastic container. Glass is a much better solution.
Label the containers
Chances are you are storing more than one strain of cannabis seeds. Even if you are storing just one variety of seeds, you must label the container. Otherwise, if you store the seeds for years, you may forget which strain they are and that they are even marijuana seeds!
Keep light out
This part is simple; germination needs light. If you do not want your seeds to sprout, keep the light out. That’s why the most immediate answer to “how to store cannabis seeds” is “keep the environment light free.”
Want an easy way to keep light out?
Try using an opaque container. If the glass jars you used aren’t opaque, then place your seeds in something opaque, such as a black plastic wrap, then put that in the glass jar. Again, keep in mind, plastic is not the best for long term (years), but if you are purchasing at the end of one grow season in preparation for the next, it should work just fine.
You can also place your cannabis seeds in a fridge that doesn’t get opened much or another dark location.
Keep the temperature constant
Another thing that you need to think about when storing cannabis seeds is to maintain a stable temperature. Try and keep the seeds around 40° Fahrenheit. You do not want them to freeze.
Many people do this by keeping their seeds in a fridge or freezer. (Again, do not allow the seeds to freeze.) The most critical thing is keeping that temperature constant. Your marijuana seeds can deteriorate when the temperature fluctuates.
Keep moisture out
Moisture is the other condition that is required for germination, so you’ll need to keep your seeds dry as well. Depending on how much moisture your marijuana seeds are exposed to, they could either germinate or even rot while in storage.
For the best results, keep moisture levels between 5% and 9%. An airtight, sealed container is a great way to do this. You could also add something to help absorb any moisture, such as silica packets or even uncooked rice.
If you decide to use one of these methods, make sure you use something food-grade. Remember, this material will be sitting in storage next to your seeds. It’s also a good idea to use some sort of barrier, such as some cotton wool, between your moisture-absorbing packs and the marijuana seeds. This will leave the seeds undisturbed while the moisture problems are addressed.
Keep the storage environment clean
How to store marijuana seeds properly also means keeping the storage environment clean. If you’re not careful, pests can quickly destroy your cannabis seeds if they access the storage container and its contents.
A clean environment also keeps other contaminants, such as microbes, from compromising the quality of your seeds. After all, you will eventually plant those seeds, and you don’t want to consume cannabis grown from contaminated seeds.
Nature-designed seeds to last until the ideal germination environment occurs. Therefore, if you follow these storage tips and prevent that environment from happening, you could store cannabis seeds indefinitely.
Does it need to be perfect?
No. If you only need to store cannabis seeds for a few months, you don’t need to be that strict. However, if you’d like to keep your seeds for years, plan ahead and take the necessary precautions, and you’ll be delighted that you did.
Ready to start finding the best seeds for growing your own marijuana? Explore high-quality weed seeds in my shop.
How To Store Cannabis Seeds
Even though they don’t seem to do much, seeds are alive. They need to be handled with care and kept safe until you’re ready to grow them. If you’re not sure how to store cannabis seeds correctly, don’t worry, we’ve got you covered.
Seeds are pretty pricey, and there’s a lot more to storing weed safely than you might think. If you expose them to the elements and extreme temperatures, they’ll die.
Below we’ll discuss how long marijuana seeds last, the ideal storage methods, the role of environmental factors, and how to germinate cannabis seeds. Let’s get started!
How long do marijuana seeds last?
Seeds require proper protection from the elements to last. If carefully stored, you can extend their shelf-life.
How long do marijuana seeds last? Most last up to six months at room temperature, but this timeline extends for users who keep the seeds refrigerated.
High-quality options can survive up to 10 years, but the duration varies according to environmental factors and the chosen strain. Hardy cultivars can withstand the test of time, while weaker varieties only last for three years.
Even the most expensive cultivars can’t survive in unfavorable conditions. Learn all about the various methods available before you start storing marijuana seeds.
How to store cannabis seeds
Seeds are living organisms. If you don’t take proper care of them, they can die. Using the right techniques for storing cannabis seeds means that you can preserve them for extended periods until you’re ready to plant them.
Before you decide on a suitable method, you need to ensure that the environmental conditions are ideal. Important considerations are:
- Humidity levels
- Temperature fluctuations
When any of the above factors aren’t correct, it can cause your seeds to germinate early or wilt.
If you’re wondering how to store cannabis seeds, light exposure is the first consideration. Seeds are unlikely to germinate when you store them in dark places. Storing your seeds near a window exposed to the sun’s rays can cause roots to sprout.
Too much light can also force the seeds to use their nutrients to survive before germination. This exposure causes the seeds to weaken, and they won’t develop once you plant them.
When it comes to humidity and storing cannabis seeds, you need to balance them carefully. If you have RH levels below 8%, your seeds become vulnerable to pests. Humidity levels above 10% can result in fungi developing and levels above 60% cause wilting and death.
The ideal range is 21–30% for short-term storage. Preserving seeds for longer periods means you need to keep them as dry as possible at 8–10%. Various levels have different consequences for the seeds.
|Below 8%||At these levels, any pests or insects around the seeds become active, reproducing and damaging them.|
|8–10%||The risk of pests still exists, but it’s the optimal relative humidity (RH) for long term storing of cannabis seeds.|
|12–14%||Fungi flourish in these conditions, which harms the seeds and affects their ability to germinate later.|
|18–20%||The seeds may sweat, and heating can cause them to rot.|
|20–30%||These levels are ideal for storing cannabis seeds for short-term use.|
|40–60%||When you increase the RH to 40–60%, seeds start germinating. These are also the optimal levels for cultivating most strains of cannabis.|
|80–100%||These levels are too high for storing marijuana seeds. Within 12 hours, they’ll start drowning, wilting, and dying.|
The best way to store marijuana seeds is in cool conditions, with 43°–47°F temperatures. The cooler it is, the less likely your seed will be to germinate. Many growers use a “no frost” refrigerator. The best place to keep them is in the fruit and vegetable section.
They need to be vacuum sealed beforehand. It’s safe to say that when you store cannabis seeds, the ideal environment is cold and dark with low humidity. Aside from refrigeration, some growers use a freezer or a dark spot at room temperature.
Any fluctuations in these conditions put your seeds at risk. You must keep your containers sealed until you plan to plant them. Opening them exposes the seeds to bacteria and pests.
Choosing containers: the best way to store marijuana seeds
If you want to know how to store cannabis seeds with minimal risks, you must choose the appropriate container. Different options are available depending on the duration of storage. Growers typically select between:
- Ziplock bags
- Mason jars
- Plastic containers
- Mylar bags
- Vacuum sealable containers
How to store cannabis seeds in the long term
If you’re wondering how to store cannabis seeds for more than six months, the most efficient option is a vacuum seal container. Ensure that it’s dark-colored and restricts access to light.
Place it at the back of your fridge or freezer. Once again, you need to ensure the appropriate RH levels. Use a desiccant to maintain the moisture levels and absorb ethylene. Popular options are silica gel packs or uncooked rice.
How to store cannabis seeds in the short term
Storing marijuana seeds in the short term is probably the easiest. You can select a drawer or cupboard that’s cool and dark. Ensure that the spot has a consistent temperature. Containers that work well need to be airtight.
Many growers use foam canisters, plastic containers, and mylar bags. The main factor is that they need to keep oxygen and water molecules out.
The best way to store cannabis seeds in the medium term is in an airtight container like a mason jar, ziplock bag, or vacuum sealable container.
You can use a refrigerator to extend the lifespan of your seeds. Be sure to check the humidity levels, as some refrigerators have low humidity levels.
Method for storing cannabis seeds
If you’re collecting seeds from the buds, you first need to dry them. After harvesting, place the buds in a humidor box for roughly 14 hours, then transfer them to brown bags for 2-3 days.
After that, place them back in the humidor box for another week, whereafter mature seeds should start falling off. This drying and curing procedure helps with the long-term preservation of seed quality. If you’ve purchased your seeds from a credible seed bank, you may skip this process.
The steps for how to store cannabis seeds are:
Step 1: Label your containers for easy identification later. It also minimizes light exposure.
Step 2: Insert a desiccant and place a layer of cotton wool as a boundary to separate it from the seeds. This step ensures that the moisture will be absorbed, and the seeds won’t be disturbed.
Step 3: Put the cannabis seeds on the other side of the cotton barrier and seal the container. Place it in the desired location until you’re ready to plant.
How long can you store cannabis seeds?
You can store cannabis seeds for anything from a few days to a few years. You need to control environmental factors carefully, and the better you are at providing optimal conditions, the longer they’ll last.
The containers you choose, temperature, and humidity levels all play a role in the total duration of safe marijuana seed storage.
How to germinate stored cannabis seeds
After storing cannabis seeds, you first need to establish they’re still healthy and viable. Ideally, they should be dark, round, and smooth. If they’re pale, white, and shriveled, you might not be able to get them to sprout.
A great way of testing them is by popping them into a glass of water. Seeds that sink are more likely to germinate. Ones that float might still grow a root, but the cannabis quality it produces will be poor.
You can try a few techniques for stubborn stored seeds that seem like they aren’t viable.
From the fridge
When you’re ready to cultivate your weed crops, remove the seeds from the fridge. This process is similar to the changes in nature when winter turns to spring. Place them in a glass with room temperature water for 12 hours.
To give them an extra boost, you can add one of the following solutions to the water:
- Fulvic acid
- Germination booster
- Hydrogen peroxide
- Gibberellic acid
Some seeds may germinate during this time. If not, you can still try one of the other germination methods.
If you’ve been storing your marijuana seeds for a long time, the outer shell may be quite hard—scarify the seed may be a good option to break the tough outside layer. Using sandpaper, gently scratch the seeds’ surface to allow moisture and warmth to enter it. You can do this before soaking.
Over time the ridge of each seed gets extremely tough. You can enhance the chances of germination by removing the ridge with a sharp knife or blade.
When you store cannabis seeds for a long time, there’s a chance they might not sprout roots. If all the other methods don’t work, you can use a blade to make a small cut in the shell. Ensure that you don’t damage the inside of the seed.
Short term storage germination
If you’ve only kept your weed seeds in storage for a couple of weeks, you can use the same methods as with newly purchased seeds. Common methods include:
- The paper towel method
- Ziplock bag technique
- Cotton wool germination
The paper towel method
This germination method is popular with marijuana cultivators. It’s affordable, easy, and uses mainly household items. It’s great for when you’re no longer storing cannabis seeds, as you can check for progress daily.
To use this method, you’ll require:
- Two paper towels
- Two dinner plates
- A bowl of water
- Cannabis seeds
The two dinner plates serve as a makeshift germination station.
1: Set out one of the plates as the base of the setup.
2: Wet the paper towels in the bowl of water and squeeze out any excess liquid so that they’re damp, not soaking.
3: Place one paper towel on the plate and space the seeds an inch apart on it.
4: Gently cover the seeds with the second paper towel.
5: Cover it with the plate.
Similar to the environment where you store cannabis seeds, you need to place your setup in a cool, dry place. Check on them daily, and add moisture if they seem to be drying out.
If the seeds don’t germinate within a week, they’re not viable. Check our germination guide for more info on this method.
The Ziplock bag technique
The Ziplock bag technique is quite similar to the previous method. The main difference is that instead of placing the paper towels between dinner plates, you slide them into a ziplock bag.
You store marijuana seeds at a lower humidity level than when you germinate them, and the increase encourages roots to sprout. Placing them in a Ziploc bag traps the moisture and provides the ideal environment for the seeds to flourish.
Germinating using this technique takes between 5-7 days. If there’s no sign of roots developing, discard the seeds.
Cotton wool germination
Growers have used cotton wool as a germination tool for many years. Some use it to start bean plants and other vegetables, but it works just as well for helping weed seeds get started.
This method works best if you’ve been storing the cannabis seeds for a few weeks and it requires:
- Two cotton pads
- A bowl of water
- Cannabis seeds
- A container with a lid
1: Soak the cotton pads in the bowl of water and squeeze out the extra liquid.
2: Smooth the cotton pad flat at the base of the container.
3: Place the seeds an inch apart on the cotton you’ve just inserted.
4: Cover with the second damp cotton pad and close the lid.
Place the setup in a cool, dry place and check on it every 24 hours. If the cotton appears dry, add moisture with a spray bottle. Seeds should germinate within seven days.
Locking up seed storage
Storing marijuana seeds is not as simple as it sounds. If you place them in a cupboard and forget about them for a few months, they’ll likely die.
You need to ensure that the temperature and humidity levels are correct and the space you choose needs to be dark. You also need to consider which container you’ll use carefully. Airtight options provide the best results.
Now that you know how to store cannabis seeds head over to the Homegrown Cannabis Co. store and browse through the wide range of options.
To keep learning about the importance of storing your cannabis seeds correctly, check our Potcast on the subject:
About the author: Parker Curtis
Parker Curtis has around a decade of cannabis-growing experience, specialising in soil-less and hydro grows. He’s mastering outdoor, greenhouse, and indoor grows.