Why is humidity control critical in seed storage?
Written by
Olivia Mitchell
Reviewed by
Prof. Martin Thorne, Ph.D.Maintaining low humidity in seed storage prevents mold growth and premature seed germination. Once a relative humidity of more than 40% is present, biological activity can occur, depleting the resource's potential. I have opened boxes and found wet, sprouted peas that were ruined due to inadequate humidity. Humidity regulation is as important as any other condition when it comes to achieving successful storage, rather than wasting time and effort.
Desiccant Solutions
- Silica gel packets absorb ambient humidity effectively
- Clay desiccants offer reusable moisture control options
- Rice grains provide natural alternatives for DIY systems
- Replace indicators when they change color signaling saturation
Container Sealing Systems
- Silicone-gasketed lids create moisture-proof barriers
- Vacuum-sealed systems remove oxygen and humidity completely
- Double-container methods prevent external humidity intrusion
- Regularly check seals for wear compromising effectiveness
Elevated moisture levels have an adverse effect on seeds at the cellular level. Seeds absorb water, which causes expansion, puncturing delicate structures in the embryo. This damage is irreversible, and the subsequent germination rates are permanently reduced. My tomato seeds became non-viable after storing them in my house during a humid summer. Using appropriate containers eliminates structural damage.
Establish stable micro-environments by using airtight containers. Airtight containers create a closed and sealed space with stable humidity levels. Changes in outside conditions less impact them. My basement storage stays dry during humid, hot summers by utilizing this idea. You can use a desiccant to create a protective environment that maintains stable microenvironments by preventing moisture from entering.
Proactively monitor the humidity level instead of guessing at the level. Place inexpensive hygrometers in each container. Check them monthly during high-humidity seasons. I checked my storage recently and discovered it was hovering near 50% RH before I added some extra desiccant. Being vigilant with the level of humidity preserves the life of your seeds!
Read the full article: 10 Best Seed Storage Containers
