Cannabis seeds can last for many years, but how can you make sure old seeds will still germinate? In this article, you’ll learn how to test the viability of old cannabis seeds and some tips for successful germination.
1. How long do cannabis seeds remain viable?
The viability of cannabis seeds depends greatly on how they have been stored. Under ideal conditions (cool, dry and dark), seeds can remain viable for up to 5 years or more. However, if stored unprotected, they will quickly lose their ability to germinate.
Tip: Store cannabis seeds in airtight containers at low temperatures (5-8°C) and humidity below 10%.
2. How can you test the viability of old cannabis seeds?
To check whether old seeds are still viable, you can put them in a glass of water. If the seeds sink to the bottom after 24 hours, there is a high probability that they can still germinate. Floating seeds, on the other hand, are often no longer viable.
Tip: Use lukewarm water for the test to avoid damaging the seeds.
3. How do you successfully germinate old cannabis seeds?
Germinating old cannabis seeds can be more difficult than fresh seeds as their outer shell often becomes harder. However, there are several methods to improve the germination rate:
- Sandpaper method: Gently rub the seeds with sandpaper to break through the hard shell.
- Pre-soaking: Soak the seeds in water for 12 to 24 hours before placing them in a damp paper towel.
- Use of germination aids: Products such as hydrogen peroxide or special germination solutions can support the germination process.
4. What to do if the seeds do not germinate?
If the seeds show no signs of germination after several days, some tricks can help increase the chances. Sometimes a change in temperature or humidity conditions can start the germination process.
Tip: Try to keep the temperature constant at 20-25°C and check that the germination medium is sufficiently moist.
5. What mistakes should you avoid?
With old seeds, some common mistakes can reduce the chances of germination. Too much moisture can cause the seeds to rot, while an environment that is too dry will prevent germination. Sudden changes in temperature should also be avoided.
Avoid: Growing media that is too wet and extreme temperature differences.
Source: https://growdiaries.com/journal/old-cannabis-seeds-seed-viability-germination-tips-and-more