How to Properly Store Seeds for Future Planting

EEdgar September 16, 2023 9:31 PM

Whether you are a seasoned gardener or a novice, knowing how to properly store seeds for future planting can make a significant difference in your gardening endeavors. Not only does it save money, but it also allows you to store your favorite plant varieties for future use. Proper seed storage is essential to maintain the germination capacity and viability of the seeds. Here's everything you need to know about storing seeds.

Preparing Seeds for Storage

Before storing seeds, it's important to properly clean and dry them. Here's how you can do it:

  1. Harvest the seeds: Harvest seeds from mature fruits or flowers. It's best to harvest seeds on a dry day to reduce moisture content.

  2. Clean the seeds: For seeds from fruits such as tomatoes or cucumbers, remove them and rinse under cold water to eliminate pulp and residue. For seeds from flowers, remove the seeds from the flower head and separate from chaff.

  3. Dry the seeds: Spread the cleaned seeds on a piece of newspaper or a paper towel and let them air dry for about a week. Ensure they are thoroughly dry before you store them.

Best Ways to Store Seeds

There are various ways to store seeds. The optimal method depends on the type of seed and your available storage conditions. Here are some common methods:

  • Paper Envelopes: These are great for storing seeds because they allow air circulation. Write the seed variety and date on each envelope.

  • Glass Jars: Glass jars with airtight lids are perfect for seed storage. They protect seeds from moisture and pests. It's recommended to add silica gel packets or powdered milk wrapped in tissue to absorb any excess moisture.

  • Plastic Bags: If choosing plastic bags, ensure they are sealable. Just like with glass jars, consider adding a moisture absorbent.

Seed Storage Conditions

The two critical factors affecting seed storage are temperature and humidity. Seeds prefer cool, dry conditions. Here's a simple rule to remember, referred to as 'The 100 Rule': The sum of the storage temperature (in Fahrenheit) and the relative humidity (in %) should not exceed 100 for optimal storage conditions.


Seeds can be stored at room temperature, but for long-term storage, colder temperatures are best. A refrigerator set at around 40°F is ideal for most seeds.


Seeds need to be kept dry to maintain their viability. Humidity levels should be kept below 50%.

Storing Seeds in a Refrigerator or Freezer

Storing seeds in a refrigerator or freezer can extend their viability. However, there are certain things to consider when using these methods:

  • Refrigerator: Ensure seeds are thoroughly dry and sealed in an airtight container. The temperature should be consistent.

  • Freezer: Only seeds with a high oil content such as sunflowers or flax can be stored in the freezer. Never freeze seeds that you plan to sow immediately as they might not germinate.

Planting Stored Seeds

When you're ready to plant your stored seeds, take them out of storage and let them acclimatize to room temperature for a day or so to reduce condensation. Perform a germination test on a few seeds before planting them all. Seeds that have been properly stored will have a better germination rate and produce strong, healthy plants.

In conclusion, proper seed storage is a key aspect of successful gardening. By following these guidelines, you'll be well-equipped to store your seeds effectively, ensuring a bountiful garden season after season.

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