How Long Do Marijuana Seeds Last?

How long do marijuana seeds last?

It’s an important question.

Cannabis seeds are EXPENSIVE and if you have some leftover from your recent grow, you want to know how long they will be viable for so you can use them again.

The germination rate of Marijuana seeds naturally declines over time.

However, if stored correctly, your seeds can last for up to a decade! To last that long, they need to be high-quality and be stored in a refrigerator.

If stored in a dry and dark place, they will last from one to five years.

Read on to find out how to store your seeds correctly to keep them viable for longer!

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How Long Are Cannabis Seeds Viable?

Good quality seeds last longer, but how long marijuana seeds last depends on their care and storage.

Ideally, seeds should be planted as soon as possible.

Although older seeds do germinate, the amount they do is significantly decreased as time goes by.

Experts recommend planting your seeds in the first three years.

Factors like light, temperature, and humidity will affect your seeds.

If your seeds are exposed to any of these, they will begin to start using their energy stores before they are planted and will eventually not germinate.

High humidity can lead to fungus growing and destroying your seeds.

This is why storage in a cool and dark environment is a must.

How To Tell If Your Cannabis Seeds Are Still Good

You can tell if your seeds are healthy by examining them closely.

Investing in high-quality seeds is the first step to getting a good yield.

Healthy seeds are dark in color and appear to have a waxy coating on the outside when examined under lights.

They feel firm and sturdy to the touch and do not break under slight pressure.

Old or low-quality seeds are weak and will likely crack or crumble easily under small amounts of pressure.

You do not want to waste your time growing these seeds as they will likely crack in storage and never germinate.

Seeds that are too young are lighter in color, like green and white.

These seeds will either take a very long time to germinate or not germinate at all.

A surefire way to check if your seeds are still good is to try and germinate them.

Seeds take around 3 days sprout. If your seeds do not germinate, they’re of no use!

Will Cracked Marijuana Seeds Still Germinate?

No, seeds that crack or get damaged will not grow.

When a seed cracks, its insides are exposed to light and air and thus, it cannot germinate.

Make sure you store your seeds in a way where they do not rattle around or hit each other.

You can also stuff your containers with cotton wool to prevent damage.

One time when people sometimes intentionally crack the outside of a seed is during germination.

This is done to allow for the taproot to sprout before planting but is not a method used by everyone.

How To Make Your Marijuana Seeds Last Longer?

How long marijuana seeds are viable for depends on several factors.

The temperature you store them at must be low.

Higher temperatures can lead to germination and even rotting.

The ideal temperature for storing seeds is 5 degrees Celsius and lower.

Light also signals the seeds to start growing and must be blocked.

Humidity or moisture feeds plants and helps them grow.

This is why your stored seeds should be far away from a humid environment.

Most experts recommend a humidity level below 5%.

Lastly, try to reduce the amount of oxygen the seeds are exposed to as much as possible to avoid the growth of bacteria and parasites.

Use A Reliable Seed Bank

Anyone can build an attractive website and sell seeds, but how do you know that you’re getting high-quality stuff?

First, look at the website and the location of the seed bank.

If it is an offline retailer, check out the address of the shop and make sure its legitimate and not just some P.O box.

You can also check the reviews online.

If it is an online business, look at the website and its reviews.

Sites that have several positive reviews can be trusted.

Next, look at the shipping details of the company.

How long will your seeds take to reach your mailbox? Do they offer discreet packaging?

Make sure that they offer a delivery guarantee.

This means that if your product is seized or damaged along the way, you will be guaranteed a replacement.

This is often the mark of a trustworthy and confident seller.

Look at the variety of seeds the store offers.

The bigger the collection, the more options you have to choose from.

Finally, a company should have a high success rate.

If they have great reviews and offer replacements, free shipping, and great customer service, you can confidently take a chance on them.

Select Strains With Strong Genetics

Good genes create good plants.

Just like in human beings, characteristics of parent plants are passed down into their offspring.

Each strain carries its unique genotype and phenotype.

The genotype is the genetic makeup or blueprint of the plant.

The phenotype is influenced by the environment it was grown in and has many effects on its color, smell, and potency.

Breeders work hard to isolate specific strains over generations of plants.

You can differentiate between strains with strong genetic backgrounds based on effect, taste, look, and smell.

Some strains also have their unique qualities due to being grown in different areas of the world over centuries.

There are thousands of strains available, with each having slightly different characteristics due to hybridization.

Do your research and make sure your seller has a good reputation.

You can find this out by reading on their website and seeing if they provide information on their breeding procedures and plants.

Store Them Properly

The type of container you store it in will affect how long your seeds will last.

Improperly stored seeds will lose their ability to germinate quickly.

It is advisable to always add a desiccant like silica gel packs or rice to remove humidity.

It also absorbs excess ethylene that is produced during the aging process and prolongs the life of your seeds.

The most popular methods for seed storage are-

Ziplock Bag

A Ziplock bag works well when you want to store seeds for a short duration of around 5-6 months.

Any longer than that and your seeds may start to go bad.

Put your seeds into your bag, try to remove as much air as possible and then seal it tightly.

Then keep your bag in a cool and dark place.

Vacuum- Sealed Bag

A step further than a regular Ziplock bag, a vacuum-sealed bag will ensure that there is no air left inside your bag.

This will allow you to store your seeds for a longer period.

You will still need to ensure to keep it in a cool, dark environment.

Some seed banks deliver seeds in a vacuum-sealed package that can store them until they’re ready for planting.

Airtight Container

Another great method for long term storage is keeping your seeds in an airtight container.

Glass containers are preferable as they are more resistant to heat and UV ray damage.

Just make sure to keep them away from light.


If you are looking to store your seeds for over a year, you can refrigerate them.

Refrigerators offer constant low temperatures and dark and moisture-free environment.

Keep your seeds at the back of your fridge so that they are away from any potential moisture or temperature changes from opening it often.

Make sure the container or bag your seeds are in is airtight and heatproof.

You will also want to make sure that your fridge is “no-frost” or has a no-frost area to shield seeds from frost damage.


Freezing marijuana seeds is a debated method.

Freezing is used by some to store their seeds for years on end.

Others say that it ends up killing seeds instead of protecting them.

Some growers even believe that freezing seeds can damage their internal cells.

Using special laboratories and equipment can allow for the careful freezing of seeds, but this is not a very cheap or accessible option for many.

Summing Up

Now that we have covered everything there is to know about how long marijuana seeds last and how to store them, you are all ready to begin your growing adventure.

We’ve made sure to cover all our bases- from basic seed facts to how to choose the best seed bank.

The rest is now up to you.

Leave us a comment down below about your seed growing and storage experience!

James Alexander James Alexander
Hey, I'm James! The founder and head writer here at I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

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