Do Flower Seeds Ever Expire?

Purchasing too many seeds may lead to leftovers.

Flower seed packets and vegetable seed packets are printed with an expiration date. If you buy too many seeds one year, you may be tempted to use the leftovers the following year.

The Facts

Whether the seeds are still usable depends on how they are stored and what kind of seeds they are. According to Oregon State University Extension Service, seeds for annuals are usually good for 1 to 3 years. Seeds for perennials are usually good for 2 to 4 years.

Storage

Leftover seeds should be kept in a cool, dark place. According to Oregon State University Extension service, seeds should be stored at 50 degrees and at 50 per cent humidity. Unused seed packets can be placed in a sealed jar with rice or powdered milk to absorb moisture and placed in the refrigerator, according to OSU.

Considerations

There is no harm in planting old flower seeds, but outdated seeds may not grow. Those that do germinate produce the same quality of plants as fresh seeds. Even if flower seeds are past expiration, planting them is worth a try.

References

• Oregon State University Extension Service: How Long Do Garden Seeds Last?
• National Gardening Association: Saving Flower Seeds for Replanting
• Colorado State University Extension: Storing Vegetable and Flower Seeds