How To Store Weed Seeds

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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 Cannabis seeds are a product that we must keep in the best condition possible to prevent them from suffering the slightest damage. As a living organism, we must follow… Handy dos and don’ts for storing cannabis seeds. Following these tips should keep their germination rate unchanged for at least two years. Read more!

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.

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.

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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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How to Keep Cannabis Seeds in Perfect Condition

They are where it all begins. The care you give your cannabis seeds will determine not only how your plants grow, but also the final results of your harvest. As we are dealing with a natural product that needs to develop, the conditions under which it is stored will have an impact on their subsequent yield. Thus, though marijuana seeds are quite robust and autonomous, if you want to avoid unwanted setbacks when you plant them, you should take steps immediately after obtaining them.

Storage temperature: 6° C / Germination temperature: 24° C

Note these two temperature limits to calibrate the range in which you operate. Keep in mind that the ideal temperature to store seeds is around 6 to 8° C. Hence, the most expert growers have a refrigerator just for this purpose, with low temperatures being constantly maintained. The same is true with regards to humidity: if you do not want your seeds to suffer any damage it is advisable to keep them in places with a relative humidity of around 20-30%.

To keep your seeds in a cool place you’ll only have to make some space for them in your refrigerator at home (if it is a no-frost model, and in the fruits and vegetables crisper, even better), though ensuring that it is dry enough for their proper preservation will be a bit more complicated.

Humidity control via micro conservation in Eppendorf tubes

To keep humidity low, it is ideal to have some sealable containers on hand. To do this, a highly recommended option is to use Eppendorf tubes, a standard piece of laboratory equipment used for the preservation of liquid samples, and the very ones in which we provide our customers with our seeds.

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These are small cylindrical containers with conical bottoms, made of polypropylene, and with hermetic seals. With this method of micro conservation the containers full of seeds are protected individually, in such a way that, even if there are variations in the outside atmosphere, inside the container the humidity conditions are constant.

To ensure this we place small pearls of silica gel inside the tubes so that, even if the outdoor humidity rises, or the temperature varies, we can be confident that the air is completely dry inside. The cap of the Eppendorf guarantees that no humidity gets in, but the silica gel also ensures that, if any were to penetrate it by accident, it would be immediately absorbed by this material.

If you do not have any of these containers, you can always use some opaque and airtight plastic bottles, which will also do the trick. Inside, along with seeds, it is a good idea to place some dry rice or silica crystals, separated from them by means of a cotton ball or paper. These elements will absorb moisture from the atmosphere, which, depending on one’s location, can be around 25% or higher.

Run from the light

You must not forget that light is another of the factors that directly impact seed germination. Therefore, you must be sure that you prevent light from shining on the seeds that you will later be planting. If exposed to light, they can lose much of their germinative power. This is why at Dinafem we place our Eppendorf tubes in opaque metal boxes, which protect the seeds from light and any possible crushing or breakage during their transportation or handling.

If you follow these guidelines you can preserve your seeds for several years. In fact, there are experts who contend that, if storage conditions are ideal, there are seeds that will last for up to a decade.

Labelling the different strains, essential to differentiate between them

It may seem obvious, without a doubt, but don’t forget to label the different strains you have. Once you store the seeds in their containers you should only open them to plant them. It is not advisable to open and close the container you are using, as the protection your seeds are provided is immediately lost once it is opened, and fluctuations in temperature and humidity can be highly detrimental.

Labelling the strains you have is even more vital if you cannot see the seeds. This can be the case if, for example, you follow the advice of some growers, who instruct more inexperienced growers to store their seeds in analogue film tubes. In cases like this you can simply stick a small label on it and jot down with a pencil the name of the strain in each tube, which should be placed, in turn, inside a piece of Tupperware to prevent its contents from deteriorating.

Other tips for storage

If you do not plan to store your seeds for a long time, but rather intend to plant them and harvest them as soon as possible, perhaps it will not be necessary to steal space from your fruits and vegetables in your refrigerator. Some recommended storing seeds in a closet located in a dark part of the house, where the natural light of day does not affect them too much, and so that they are kept dry and, more or less, cool. This location can be a good choice as long as you are going to plant your seeds soon.

Whether you choose to store your seeds in a refrigerator designed exclusively for their maintenance, or in a dark corner of your house, you will have to pay attention to other risks that can end up damaging them. Many experienced growers stress that seeds must be dried correctly and left under proper humidity conditions to prevent mould from appearing inside the receptacles. To keep this from occurring, in addition to drying the seeds properly, it is a good idea to always use silica gel when storing them.

Some potential hazards

Another threat that can ruin all your efforts are insects. Just one in your container is enough to render all the seeds inside useless. To prevent this it is advisable to spread diatomaceous earth where you store them. D.E. is a kind of sand with a fossilised algae base. It is inert and non-toxic, and functions as an invaluable natural insecticide. If you keep your seeds in your fridge with other foods, this will not be a good place to use this type of substrate. However, if you have a refrigerator just for this purpose, or a simple closet, you will be able to use this trick.

If a container you are using is left open, and a rodent somehow gets into your house, the consequences can be dramatic, both for you and your harvest, of course, because the animal will enjoy a great feast at your expense. This is why, among other things, something as simple as placing your containers up high can be a good way to prevent such disasters.

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There are many factors to keep in mind when it comes to storing cannabis seeds. Keeping an eye on the temperature, light and humidity is vital, as they can affect your seeds’ germination capacity; if they normally germinate within 48 to 72 hours, when stored under poor conditions it can take up to 6 to 7 days. Or never. But this is not enough. You must also protect them from other external agents that, without your knowledge, can end up ruining your next harvest, or one you had planned for a later date.

Author

D. Civantos Professional journalist and blogger, I’ve, for more than a decade, been the head of Nexo Contenidos, a company specialized in the cannabis world and in wide-ranging digital media. You can find me not only on Dinafem, but also on Strambotic, Cooking Ideas and many other blogs floating in the uncharted waters of the net. However, when I feel most at ease is working with cannabis, one of my biggest passions from a very young age that has now become the main focus of my work.

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Storing Cannabis Seeds – Some Handy Dos and Don’ts

Keeping your cannabis seeds safe and viable is essential. To help you get the most out of your “magic beans”, here are some handy dos and don’ts for correctly storing cannabis seeds.

1. DO – keep your cannabis seeds dry.

Damp or wet seeds will begin to germinate, and even small amounts of moisture or humidity inside packaging can cause rot and mould.

2. DON’T – let them get too warm.

Warmth will also encourage germination, and high temperatures can damage cannabis seeds, effectively ‘cooking’ the insides.

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3. DO – keep them in the dark.

Darkness encourages seeds to remain dormant; long exposure to light may damage and degrade the health of the seeds.

4. DON’T – squash them!

Pretty obvious really, but make sure the shells remain intact. The shell is the seed’s natural defence against outside elements.

5. DO – keep them labelled.

Cannabis seeds do tend to all look very similar; make sure your strains don’t get mixed up!

6. DON’T – let them get too cold.

Freezing cannabis seeds will damage at least some of them. The door of a fridge is the ideal temperature (5 – 6 degrees centigrade).

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7. DO – keep your hands, working area and any equipment clean and dry.

Mould and fungus can grow on seeds even when they are refrigerated.

8. DON’T – let pests or rodents get to your cannabis seeds.

Keeping them in the fridge is a good way of ensuring this also.

9. DO – make sure you buy cannabis seeds from a reputable seed bank, such as Sensi Seeds or White Label Seed Company.

Seeds should arrive in the original packaging and be clean and solid.

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10. DON’T – pack your cannabis seeds with NON-FOOD GRADE silica gel.

Or anything else that could be toxic!

Following these handy tips for storing cannabis seeds should keep the original germination rate (which, if you bought seeds from a reliable seed company, should be around 95%) unchanged for at least two years, and potentially as many as five! After some years, the germination rate will gradually decline. However, thanks to the naturally stubborn survival traits of cannabis, there is no deadline at which all the cannabis seeds in a batch will suddenly lose the ability to germinate. Anecdotal reports of cannabis seeds that were over 20 years old when they were germinated and still produced a 60% germination rate can be found on various cannabis forums, so with correct storage, your precious seeds will remain an investment for years to come!

Laws and regulations regarding cannabis cultivation differ from country to country. Sensi Seeds therefore strongly advises you to check your local laws and regulations. Do not act in conflict with the law.

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