Humidity is easily one of the biggest threats to your seeds. Here is how different levels of humidity (% relative humidity) affect your 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.
EFFECTS OF HUMIDITY ON CANNABIS SEEDS
In a last attempt to germinate your seeds, creating a small cut in the seed’s shell may help. However, this is no miracle cure, and you’ll need to be careful to avoid damaging the inside of your seed.
Cannabis seeds, with their tough outer shell, seem pretty hardy. And while nature has definitely designed them to hold up to a wide variety of conditions, cannabis seeds aren’t invincible. Rapid changes in temperature and high humidity, for example, can quickly ruin a batch of seeds. Luckily, caring for your seeds is simple. Keep reading to learn how.
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.
Keeping cannabis seeds in the fridge is the most obvious storage method. It is important to keep the seeds in an airtight sealed enclosure so no moist can get to it. In order to optimize the storage proces even further, is is wise to keep the seeds in airtight packaging. Preferably at 4 degrees celcius. Weed seeds don’t like tempurature changes. Therefore only remove them from the fridge when neccessary. This way the seeds can be preserved for years.
It’s obvious weed seeds germinating power decreases as the years progress. Therefore you should allways store some additional seeds. Will seeds still germinate after 100 years have progressed? No one knows.
Storing cannabis seeds in the freezer is the right choice if you want to store the seeds for decades or longer. Can this do any harm? No, in nature, seeds freeze all the time, after that spring begins and germination starts. Make sure the weed seeds are totally dry before freezing.
The germ that hides behind the tough seed outer shell can survive for years feeding on food reserves it inherited from the mother plant. Food supplies consisting of fad starch and sugar keep the germ alive as long as these reserves are available. Maximum lifespan is around 6 years but seeds that survive for a longer period of time are no exception.
Marijuana seeds can be preserved for a minimum of 3 years without any loss in germinating power. Probably even for much longer, only time will tell.