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How To Store Cannabis Seeds

How to store cannabis seeds

Ideal conditions on how to store cannabis seeds

You must first ensure that the environmental conditions are ideal before deciding on a suitable method to store cannabis seeds. Temperature, humidity, and light are all important factors to consider. When any of the above factors are not met, your seeds may germinate prematurely or wilt.


If you are wondering how to store cannabis seeds, light exposure is the first thing to think about. When seeds are stored in dark places, they are unlikely to germinate. Storing cannabis seeds near a window that receives direct sunlight can cause roots to sprout. Excessive light can also force seeds to use their nutrients to survive before germination. The seeds become weakened due to the exposure, and they will not develop once planted.


Cannabis seeds should be stored in cool conditions, with temperatures ranging from 43-47°F. The cooler it is, the less likely your seed will germinate. Many growers use a refrigerator with a “no frost” setting. The best place to keep them is in the produce section. They must first be vacuum sealed. The ideal environment for cannabis seed storage is cold and dark with low humidity. However, some gardeners use a freezer or a dark room-temperature spot apart from refrigeration.


When it comes to humidity and cannabis seed storage, you must strike a careful balance. If the relative humidity (RH) falls below 8%, your seeds become vulnerable to pests. Humidity levels above 10% can result in the growth of fungi, while levels above 60% cause wilting and death. For short-term storage, the ideal range is 21–30%. To keep seeds for a long-term period, keep them as dry as possible, at 8–10% moisture content. Different levels have different effects on the seeds.

How to properly store cannabis seeds

Now that you have learned everything there is to know about temperature, humidity, and light, let’s look at how to store hemp seeds.

How to store cannabis seeds long term

In the long term, the best way to store cannabis seeds is in an airtight container, mason jar, ziplock bag, or vacuum sealable container. 

Vacuum sealable bags

One of the best ways to store cannabis seeds for a long time is to use a vacuum seal or mylar bags. They can keep your seeds viable for up to five years or even longer if stored in the refrigerator. Seal your cannabis seeds in a vacuum bag, add some grains of uncooked rice or a desiccant pack, and store the bag in the back of your refrigerator—this aids in the avoidance of temperature fluctuations and light exposure. Cannabis seeds can also be frozen if kept in a tightly sealed container. However, do not thaw and refreeze them, reducing seed viability.

Mason jars

Mason jars are airtight, making them the best way to store cannabis seeds for an extended period. Use a desiccant pack and a few cotton balls or a paper towel for moisture control. Then, wrap the jar in opaque wrapping to keep the light out, and you’re done.

Cannabis seeds
Cannabis seeds stored in an airtight container

Cannabis seeds can last up to a year in the right conditions. Additionally, they can be kept in the fridge for a few years longer.

Airtight containers

Cannabis seeds can also be stored in other food-grade plastic containers, as long as they are airtight and light-proof or opaque. Because cannabis seed storage containers are more durable, they are also superior to glass jars for freezer storage. You can store your cannabis seeds directly in the container (as in the glass jar method) or a resealable bag. With the addition of a desiccant pack, you’re ready to go.

How to store cannabis seeds short-term

The simplest way to store cannabis seeds is undoubtedly in the short term. You can choose a cool and dark drawer or cupboard. Sustain a consistent temperature in these areas.

Paper envelopes

Thick paper envelopes are suitable for storing cannabis seeds for a short period. They shield seeds from ambient light and other environmental factors. Put your cannabis seeds inside with a few grains of uncooked rice or a desiccant pack to soak up any extra moisture. Next, store your cannabis seeds in a cool, dry, and dark location, such as the back of a closet or drawer. You can make your own paper envelopes for very cheap.

Sealable plastic bags

Sealable plastic bags are another excellent option for storing cannabis seeds for a short period. However, they are only suitable for room temperature environments and should not be refrigerated or frozen. Put the bag in a cool, dark, and dry place where it won’t be disturbed, and add a desiccant pack or some uncooked rice grains.

FAQs about cannabis seed storage

Can cannabis seeds be kept in the freezer?

Cannabis seeds can be stored in the freezer. The slower they decline, the lower the temperature. However, freezing cannabis seeds is usually unnecessary. If you follow the ideal conditions, you should store cannabis seeds for up to five years while still getting a high germination rate.

How long can you store cannabis seeds?

You can store cannabis seeds properly for up to five years. In some instances, they can last for a decade.

How long are cannabis seeds good for before they go bad?

All seeds can go bad, which means they lose viability over time. Cannabis seeds can also rot in high humidity. Proper storage and refrigeration or freezing slows deterioration and extends life.

How long can cannabis seeds be good for with great care?

How long cannabis seeds will last is determined by your care to store your cannabis seeds correctly. Cannabis seeds can last for a long time if you are careful. You can even stock up on strains to create your collection while remaining self-sufficient all year.

How long do cannabis seeds last?

High-quality strains can live for up to ten years, but this depends on environmental factors and the strain used. Hardy cultivars can withstand the elements for years, whereas weaker varieties only last three years. In unfavorable conditions, even the most expensive cultivars cannot survive. Before you begin storing hemp seeds, enlighten yourself on the various methods available.

Picture of Ed Rushford

Ed Rushford

Ed Rushford’s impact on cannabis growing is undeniable. Though he tends to focus primarily on 2 areas, plant training techniques and dealing with disease, pests, and other problems, he has offered many insights into how cannabis plants live and grow. That’s not to say that Ed is unfamiliar with the complete life cycle of cannabis, from seed to harvest, but he uses his widespread knowledge to hone in on the minutia and niche areas of growing cannabis. Ed’s goal is to spread knowledge and allow for everyone to become better growers. About this Author

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