Well, it all does depend on how you store them, as well as the quality of the cannabis seeds and the strain, but generally speaking, 5 years is the maximum amount of time cannabis seeds can be kept without them going bad.
A humidity level of no more than 5% at most is recommended for both short term and long term marijuana seed storage. Yes, this can be hard to accomplish depending on where you live, but we will provide some tips for this later on today.
How Long Do Cannabis Seeds Remain Viable?
Remember that you do want the canister to be airtight to keep oxygen and moisture out, and generally speaking, the smaller the better. You want there to be as little room for oxygen in that canister as possible.
Ideally, you want your cannabis seeds to be stored somewhere totally dark and not exposed to any light at all.
Alright, so you are wondering how long weed seeds stay viable for, and how you can store them to ensure that they are well preserved.
For long-term storage, it’s best to keep your seeds in a sealed container inside the fridge. Remember that opening the door of your fridge can actually cause some pretty dramatic temperature shifts. If you happen to have a second fridge that gets used less often than the one in your kitchen, use that one to store your seeds.
If your seeds get exposed to light or rapid changes in temperature, these conditions will trigger them to use up their nutrient stores before they ever see soil, meaning they won’t have the nutrients they need to germinate. High humidity, on the other hand, can trigger fungi to grow on your seeds.
EFFECTS OF HUMIDITY ON CANNABIS SEEDS
Older seeds often have an extra tough outer shell. Gently scratching this shell with some sandpaper can help moisture and warmth enter your seed at the time of germination. Try gently scarring your old cannabis seeds just before soaking to help them sprout.
The ridge is the slightly elevated side of your seed. Like other parts of the shell, this ridge can become extra tough over time. Removing it gently with a sharp Stanley blade can help your seed sprout.
Ziplock bags, for example, are great because you can remove all the air from them to create an almost vacuum-sealed container for your seeds. Once vacuum-sealed, put your bag inside a dark plastic bag or dark container to protect your seeds from your fridge light.