How Long Do Marijuana Seeds Last? A Guide to Proper Storage and Lifespan

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How Long Do Marijuana Seeds Last

Marijuana seeds can be quite a valuable commodity, so it’s important to know how long they will last. There are a few things to consider when it comes to the longevity of marijuana seeds, such as storage temperature, humidity, light exposure, and storage containers. It’s also important to know the expiration date on cannabis seeds and what type of seed or strain you have – such as brome grass seed – as these can have different shelf lives. With the right knowledge and care, marijuana seeds can last for several years or longer. However, some cases have been reported of seeds sprouting after being in storage for five or even ten years. As a general rule, try to use your cannabis seeds within the first three years of obtaining them.

Factors for Long-Lasting Marijuana Seeds

There are several factors that can affect the longevity of marijuana seeds. Temperature, humidity, storage containers, light exposure and germination are some of the most important factors to consider when storing cannabis seeds for long-term use. Temperature should be kept between 5-10°C for optimal storage, while humidity should be kept at about 10-15%. It is also important to store the seeds in a container that is airtight and dark, such as a glass jar or sealed plastic bag. Similarly, storing cannabis seeds in the refrigerator can help them last longer by slowing down the aging process. Finally, it is important to keep the seeds away from direct light exposure as this can cause them to lose their germinability over time.

Ideal Storage Temperature

The ideal storage temperature for cannabis seeds is around 4ºC (39ºF). However, this is not a magic number. With perfect conditions, you can successfully germinate 5 year old cannabis seeds. Freezing your seeds is not necessarily required, but lower temperatures will slow their decline. It is important to store the seeds in a cool, dark place to prevent mold and pathogens from spoiling them. All of these factors contribute to the longevity of your marijuana seeds.


Humidity plays an important role in the longevity of cannabis seeds. It is recommended to keep the humidity level between 40-60%, as too much can cause the seed to drown and die. It is also important to make sure that the container the seeds are stored in is airtight, as this will help keep moisture out and ensure the longevity of the seeds.

Storage Containers

When it comes to choosing an appropriate storage container for cannabis seeds, airtight and opaque containers are best. This helps keep air and light out of the container, protecting the seeds from oxidation or damage from light exposure. It is also important to note that any containers used should be clean and dry in order to maintain the integrity of the stored seeds. Glass jars are the most commonly used option for long-term seed storage, but plastic containers can also be used if they are well sealed. Many people also opt for vacuum-sealed containers for added protection. It is important to store your seeds in a cool, dark place, as heat can degrade the seed’s viability over time.

Storing Seeds in the Refrigerator

Storing your cannabis seeds in the refrigerator is one of the most effective ways to ensure long-term storage. The lower temperatures and darkness of the refrigerator will help your seeds stay viable for a longer period of time. The optimal temperature for storing marijuana seeds is between 34 and 38 degrees Fahrenheit (1-3 degrees Celsius). It’s important to ensure that your refrigerator stays at this temperature, as any fluctuation can damage your seeds. Additionally, it’s important to place your seeds in an airtight container or bag before placing them in the refrigerator. This will help keep out any moisture or light that may damage your seeds. Finally, it’s important to make sure that there is no moisture present in the refrigerator before storing your cannabis seeds. Moisture can cause mold to form on your seeds and decrease their longevity.

Light Exposure

Light exposure is an important factor to consider when it comes to storing cannabis seeds. Seeds that are exposed to light for too long can become damaged, leading to a decrease in germination rates. To ensure your seeds last as long as possible, store them in an airtight container and keep them out of direct sunlight. Additionally, it’s best to keep the storage area dark, as light can prematurely age the seeds. Be sure to check your seeds regularly for any signs of damage and discoloration. If any of the above conditions are present, it’s best to discard the seeds and purchase fresh ones.

Germination of Old Cannabis Seeds

Germinating old cannabis seeds can be a tricky endeavor. It is possible to successfully germinate 5 year old seeds, but it is more difficult than with fresh ones. The key is to ensure that they are stored properly and you should use them within the first three years of obtaining them. It is also important to note that heat and moisture will signal to the old seeds that it is time to sprout, so it is important to keep them in a dry, dark environment. When storing cannabis seeds in the refrigerator, make sure that they are placed in an airtight container and kept away from any other food items that could cause moisture build up.

Expiration Date on Cannabis Seeds

The expiration date on cannabis seeds can vary depending on how they were stored, but generally speaking, a cannabis seed can last anywhere from one to two years before going bad. However, if the seeds are stored in ideal conditions, such as a cool, dark, and dry place with a low level of humidity, the life span of the seed can be greatly extended. Additionally, storing seeds in the refrigerator can help to extend their shelf life. It is important to note that even if a seed is past its expiration date, it is still possible to germinate it successfully. However, the older the seed, the less likely it will be to germinate properly.

Brome Grass Seed

Brome grass seed has been found to remain viable for up to nine years, however, it is recommended that three to four years of seed-set control be implemented in order to remove the seed bank of this species. This is especially important in southern areas, where dormancy is not as common as in other areas. It is important to note that, as with marijuana seeds, proper storage conditions are necessary to ensure a long shelf-life for brome grass seed. It is also important to keep the seeds away from light and at the ideal temperature and humidity levels in order to keep them viable for as long as possible.


In conclusion, when stored properly, marijuana seeds can last for over five years. Factors such as ideal storage temperature, humidity, storage containers, refrigeration, and light exposure all play a role in preserving the seeds for a longer period of time. Germination of old cannabis seeds is possible but their success rate is not guaranteed. It is best to use the cannabis seeds within the first three years of obtaining them to ensure the best results. There have been cases of 10-year-old cannabis seeds producing a successful germination rate. While this is not always the case, it shows that with proper storage conditions and techniques, your cannabis seeds can last for many years to come.

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Meet Edward, the passionate gardener turned cannabis enthusiast who is dedicated to exploring different strains and maximizing their yields. With his background as a hydroponic agriculture technician, he brings a unique perspective to the world of cannabis cultivation. As the head field tester at HempGrowly, he shares his technical expertise and insights to help readers achieve their own successful hydroponic grows. Through his easy-to-follow documentation of his findings, Edward hopes to help cannabis growers of all levels achieve maximum yields and enjoy the benefits of this amazing plant.