How To Store Marijuana Seeds

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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. Storing cannabis seeds in the right conditions allows you to preserve your favourite cannabis genetics for many years. Store your seed collection safely! Storing cannabis seeds under the right conditions lets you keep your favourite strains for a long time. However, doing this incorrectly can lead to a

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.

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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.

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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 the right way

Storing cannabis seeds under the correct conditions allows you to preserve your favourite cannabis genetics for many years. With the right conditions you can keep the best part of your cannabis seed collection viable for a decade or more. But get the conditions wrong and the germination rates on your best-loved feminised seeds and autoflower seeds will suffer. If you are a cannabis seed connoisseur that spends time, cash and love building a collection of the best cannabis genetics then it makes sense to learn more about storing your cannabis seeds under ideal long term conditions.

Did you know cannabis seeds are living organisms?

When preserving cannabis seeds, it’s worth remembering that seeds are technically classified as living organisms. That’s because they have an embryo which is capable of being germinated and growing into a new plant. Just like any other seed, environmental conditions for storing cannabis seeds can be fine tuned to maximise seed germination rates. But provide the wrong conditions for storing cannabis seeds and your seed germination rates will decrease rapidly. Storing cannabis seeds till germination under ideal conditions is the best way to maximise germination rates.

Key factors to watch when storing cannabis seeds

When storing cannabis seeds there are three main issues which will reduce the germination rates (or the ‘viability’) of your cannabis seeds. These are light, heat and humidity. Each of these factors will reduce the germination rates of your autoflower seeds/feminised seeds. Conversely, if you can minimise and correctly control heat, light and humidity then you will extend the lifetime of your cannabis seed collection.

Light Exposure

Inside your cannabis seeds are delicate embryonic tissues which store the genetic code. This, in turn, defines the type of cannabis you will eventually grow. When storing cannabis seeds long term, keeping the seeds away from bright light is important – don’t store them in your grow room! A sealable, light proof container is ideal.

The shell of the cannabis seed does help to protect the embryo from light. But remember, in nature, cannabis seeds were normally dropped from the plant onto the soil in autumn/fall. There they would remain under a light covering of soil until they germinated the following spring. Cannabis seeds were never designed to cope with intense light levels. Storing cannabis seeds in the fridge, in a dark humidity proof container is a good way to maintain maximum seed germination rates.

Dutch Passion cannabis seeds can be stored simply be re-sealing the seed packet with tape and placing it inside the seed tin or a container. Storing cannabis seeds in eppendorf tubes (black or amber) in the fridge is a popular technique. Eppendorf tubes are small plastic tubes normally used for storing liquids, but they are often used for cannabis seed storage too.

Humidity level

When storing cannabis seeds, humidity levels are an important factor. In order to germinate cannabis seeds, moist humid conditions are used. So it makes sense to use low humidity conditions for cannabis seed storage. You certainly don’t want to store your seeds anywhere where moisture droplets, which will soften the shell. Water/moisture is a very effective way to soften the hard, rigid shell of the cannabis seed. This allows the tap root to emerge.

When storing cannabis seeds for the long term, the actual water content inside the seed will be around 10%. Storing cannabis seeds in the refrigerator is an easy way to maintain the low humidity levels that suit long term seed viability. Just make sure that your seeds are stored in a dark, dry container without any condensation near the seeds and you should be able to store cannabis seeds in the fridge for perhaps 5 years or more and still have good germination rates.

It’s not necessary to measure humidity levels in your fridge. Just ensure your seeds are in a sealed dry and dark container inside your fridge and they should last many years.

If you have produced your own cannabis seeds you may be aware that when they are very fresh, straight off the plant, they may even be a little too fresh to germinate. That’s why some believe in storing and maturing cannabis seeds for a short period at room temperature. This allows moisture content of the seed to drop enough for the seeds to become more viable. How long to let seeds dry before storing? A couple of months at room temperature should be sufficient.

Humidity levels Effects on cannabis seeds
75% to 100% Humidity is too high, causing seeds to have excessively high internal moisture content which decreases long term germination viability.
25% to 75% Good for cannabis seed storage, especially at low temperatures in sealed/dark containers.
0% to 25% Too dry, seeds may desiccate (dry out excessively) especially if they were not in a sealed humidity proof bag/container.

Temperature fluctuations

Storing cannabis seeds at low humidity levels in a dark place is a great way to maintain good germination rates. But one of the best ways for preserving cannabis seeds is to use low temperatures. At low temperatures cannabis seed life is greatly extended. This is because the delicate living plant tissue inside the seed can survive for much longer periods at cool temperatures which slow down the cellular biochemistry. It’s the same reason that food lasts longer in the fridge than it would at room temperature.

What is the ideal storage temperature for storing seeds? Most people use temperatures of around 4ºC (39ºF). But 4ºC isn’t a magic number. If you can ‘only’ store your cannabis seeds at e.g. 10ºC the seeds will last longer than they would stored at 20ºC. Storing cannabis seeds at 4ºC will allow longer seed storage than 10ºC.

Storing cannabis seeds in the freezer (-15 to -20ºC) is also possible and this allows even better seed storage. However this does come with some risks. When stored at freezer temperatures you can expect cannabis seeds to remain viable for decades. The very low temperatures effectively allow the seed embryo to survive for long periods.

Cannabis seed companies such as Dutch Passion store their archived seed collection (1970’s & 1980’s) in the freezer. This allows long term storage. However, it also comes with certain risks. In the freezer, the delicate frozen tissues in the seed embryo can shatter if the seeds are mishandled or shaken. That’s why the freezer is only recommended for those placing seeds into very long term storage. For most home growers, the fridge (4ºC) is a great place for storing cannabis seeds.

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So what are the best ways to store your cannabis seeds?

What is the optimal temperature for storing seeds? For most people, temperatures around 4ºC (in the fridge) are perfect. If the autoflower seeds/feminised seeds are in a sealed lightproof container they are automatically at a low humidity and in a dark place.

Don’t worry too much about keeping your seeds in a fridge at all times. Remember that even without a fridge, a pack of seeds stored in a draw for a couple of years should still show good germination rates. Avoid storing your seeds in places with high temperatures or intense light, such as a window ledge or your grow room.

If storing cannabis seeds in a sealed plastic bag in the fridge remember that they are easy to accidentally crush if something is placed on top of them. A small box or plastic container can prevent that.

Should I date my seeds when storing them?
It’s probably not necessary for most people but it could be a useful guide for later germination.

How long can you preserve cannabis seeds?

In the freezer you can store cannabis seeds for decades. In the fridge, you should see good germination rates (50% or more) even after 5+ years. Without using the fridge, germination rates start to decrease earlier and faster.

If you usually germinate your cannabis seeds within a few weeks/months of purchase you may not need to worry too much about how to store them.

When cannabis seeds are supplied from the seed supplier, germination rates should be 90% or higher if you are buying from a proven supplier. Even after 5 years in the fridge you should still expect the majority of your cannabis seeds to germinate.

This is good news for those growers that have found the ideal cannabis seeds for their needs and want to ensure a viable seed collection of their favourite cannabis genetics for many years to come.

Drying, storing and maturing seeds from plants

Although not many growers can be bothered with the hassle of producing their own cannabis seeds, if you do attempt to produce seeds it’s important to know about maturing them.

When drying and storing and maturing cannabis seeds one of the main tips is to allow the fresh seeds time to rest before germinating. Fresh seeds haven’t had the natural time period required to allow them to reach maximum germination rates.

Typically seeds of various plants store better, and germinate faster when they have dried a little after the seeds have been collected. After a month or two in ambient conditions, the seeds have matured and should show higher germination rates.

What size mylar bags to use for storing marijuana seeds?
Size really doesn’t matter! Just ensure your seeds are sealed, safe from light/moisture and stored at low temperatures.

What if you found an old undated bag of seeds?

Whether you are preserving seeds of F1 landrace cannabis genetics or any other type of cannabis seeds your best chances of storing them is at low temperatures in dry and dark conditions. Many growers collect extensive (and expensive!) cannabis seed collections.

Dating each seed packet is a good idea, although it won’t improve germination rates it will give you an idea of the age of the seeds. Even after 10 years in a fridge at 4ºC you can still expect to see a some of your seeds germinate, assuming they original seed quality was high.

If your cannabis seeds are really old, some growers may suggest a few unusual tips to increases germination. Dutch Passion can’t really recommend these techniques, they simply carry too much chance of damaging the seed. These techniques include gently sandpapering the outer layer of the seed shell, perhaps including the ridge down the side. The logic here is that particularly old/hard seed shells need assistance to open.

Dutch Passion prefer to stick to proven, established seed germination techniques that should work well for most people. The best way to germinate cannabis seeds is to do so between a couple of lightly moistened cotton pads for a couple of days.

How to store marijuana seeds

Storing cannabis seeds under the right conditions lets you keep your favourite strains for a long time. However, doing this incorrectly can lead to a series of issues that end in the same result: the seeds won’t germinate. Here we analyse exactly what you need to do to keep your marijuana seeds in good condition, thereby making sure that they germinate successfully even several years later.

In order to store your marijuana seeds for a long time, it’s important to remember that they are technically classified as living organisms, because they have an embryo that is capable of germinating and becoming a new plant. And, like every living organism, your seeds can die if you don’t look after them properly.

Even though they’re quite hardy, if you don’t provide them with the suitable conditions for their correct conservation, their viability will rapidly decrease. Whilst its typical for them to germinate within 48 to 72 hours, they can take as long as 6 to 7 days if they’re stored badly. Or at worst they might not even germinate at all.

There are several factors to take into consideration that can reduce the germination rate of marijuana seeds: light, heat, humidity, and oxygen levels. As a general rule though, the most important factor to keep your seeds viable for as long as possible is to avoid fluctuations in the environmental conditions.

How to store marijuana seeds?

These are the key parameters to correctly store your cannabis seeds for the maximum time possible:

1- Exposure to light

The shell plays a part in protecting the seed’s embryonic tissue from the light, which in turn helps the seed remain dormant. In nature, cannabis seeds normally fall from the plant in autumn and remain under a light layer of soil until they germinate the following spring. Therefore, they haven’t evolved to face bright light, which may trigger the chemical processes needed for germination. Storing your cannabis seeds in a dark, opaque container is a great way of keeping top germination rates for the future.

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2- Humidity level

High relative humidity levels are required for the germination of cannabis seeds. Therefore, it makes sense to keep them under low humidity conditions when they’re being stored. If you’re only storing the seeds for a short time (no more than a few months), a relative humidity level between 20% and 30% will be fine. If, however, you’re going to store them for longer, then keep the humidity level between 8-10%.

A good way of making sure that the seeds remain dry is to include a desiccant in the container where they’re being stored (i.e. one of those little silica gel packs that are often included with different products). These packs also absorb any excess of ethylene that may have been generated as the seeds get older and that could also stimulate germination if not removed. You can even use a few grains of rice if you don’t have any silica packs available.

3- Temperature fluctuations

When it comes to storing cannabis seeds, the cooler the better. But only to a certain point. At low temperatures, the life of cannabis seeds is significantly prolonged because the cold temperature slows down cellular biochemistry and so the plant’s delicate living tissue can survive for much longer periods. Another option is to freeze the seeds to keep them for the long term; but if this process is not carried out properly, they can eventually get damaged.

So the ideal storage temperature ranges between 4° and 8°C. You can still store seeds at higher temperatures, but their lifespan will be reduced. Many growers stick to temperatures around 4°C. However, this still isn’t a magical number.

4- Oxygen level

Although this isn’t such a determining factor, a constant supply of fresh oxygen can lead to premature germination. To prevent this, keep your seeds in a bag or airtight container, ideally vacuum sealed, although as long as the container is tightly closed that should be enough.

What’s the best way to store cannabis seeds?

There are different options depending on how long you’re intending to keep the seeds. According to the requirements mentioned above, it’s best to keep them in a dark, cool, and dry place. These are the basic conditions you can find in a standard cooler or fridge (ideally ‘no frost’ so they’re protected from the damage that frost may cause). A piece of warning here: you can’t be opening and closing the fridge door non-stop.

This is why it’s best to have a fridge specifically dedicated to seed storage. Or at least a small cooler that you rarely open; because every time you do this, the inside experiences rather significant fluctuations in temperature and humidity levels.

If you don’t have another choice, at least place the seeds towards the back of the fridge, or, even better, in one of the fruit and veg drawers, where they’re more protected from these changes. If you place some desiccant in the container with the seeds, you’ll also be protecting them from any changes in humidity.

In case you don’t have a cooler at hand, you can always store your seeds in a cool basement. Even a normal room can work well: a seed pack stored in an airtight container in a drawer or cupboard in a dark area of the house should also offer good germination rates. But do avoid storing your seeds in bright light or in hot areas (such as a windowsill or your grow room).

If you normally germinate your cannabis seeds a few weeks or months after purchasing them, you don’t need to be so strict with how you store them. You’ll be fine as long as you keep them in a cool place, away from the light, and in their original packaging (which is already optimised for their protection); and, of course, follow your common sense regarding these storage rules. If you open a packet of seeds but you don’t sow all of them, keep the remaining seeds in an airtight container.

How long can you keep marijuana seeds?

Generally speaking, always look for proven quality seeds like the ones we offer you in our Kannabia catalogue: if you provide them with all the ideal conditions that have been described, you can keep your seeds for as long as 5 years after they’ve been produced. In addition, if you maintain decent storage conditions over time (i.e. without significant fluctuations in the environmental parameters), you can expect your seeds to still be good after one or two years.

Naturally, the longer you keep your marijuana seeds, the lower the chances of a successful germination. Storing them incorrectly also reduces the possibilities of success. So store them properly, as we have described in this article, and use them as quickly as you can, to ensure the highest possible germination rate.

Kannabia Seeds Company sells to its customers a product collection, a souvenir. We cannot and we shall not give growing advice since our product is not intended for this purpose.

Kannabia accept no responsibility for any illegal use made by third parties of information published. The cultivation of cannabis for personal consumption is an activity subject to legal restrictions that vary from state to state. We recommend consultation of the legislation in force in your country of residence to avoid participation in any illegal activity.

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