How long can cannabis seeds be stored?

When stored correctly, cannabis seeds can remain viable for years, but their longevity depends on several factors, including storage conditions, moisture levels, temperature, and light exposure. On average, properly stored cannabis seeds can last between 3 to 10 years, with some remaining viable even longer.

Factors That Affect Cannabis Seed Longevity

✅ Storage Conditions – Keeping seeds in a cool, dark, and dry environment helps preserve their viability. Ideal storage temperatures range between 6-8°C (42-46°F).
✅ Moisture Control – Excess moisture can cause seeds to mold or germinate prematurely. The optimal humidity level for storage is 5-10%.
✅ Light Exposure – Direct light can degrade the genetic integrity of seeds over time. Store them in an opaque, airtight container to block light exposure.
✅ Airflow & Oxygen – Too much air can dry out seeds, reducing their viability. Vacuum-sealed storage helps preserve freshness.

Best Ways to Store Cannabis Seeds

🔹 Airtight Containers – Use glass jars, plastic vials, or Mylar bags to prevent contamination.
🔹 Refrigeration – Storing seeds in the fridge (sealed in a container with silica gel) extends their lifespan, but avoid frequent temperature fluctuations.
🔹 Freezing – Some collectors freeze cannabis seeds for long-term preservation, but this method carries the risk of cell damage if not done correctly.

Signs of Non-Viable Seeds

❌ Soft or Cracked Shells – Healthy seeds should have a hard, dark-colored shell.
❌ Floating in Water – If seeds float in water after 12+ hours, they may be dried out or dead.
❌ Lack of Germination – If seeds fail to sprout after proper soaking and planting, they are likely no longer viable.

Final Thoughts

When stored correctly, cannabis seeds can last for many years while maintaining high germination rates. To maximize longevity, keep them in a cool, dark, and dry environment, away from light and moisture. Whether you're a collector or seed bank enthusiast, proper storage ensures your seeds remain viable for future use.