How long is native seed good for?

Seeds are perishable, but most seed will last atleast 2 - 3 years if stored properly. Seed should be stored in a cool, dry, and rodent free place. Temperature and humidity are important factors, and a good rule of thumb is that the temperature plus relative humidity should not exceed 100. For example, a good storage area would be a place that can be consistently 60 degrees with 30% relative humidity because adding those two numbers is lower than 100. Humidity and moisture is the biggest thing that causes seed to deteriorate quickly so try to keep that as low as possible. Some species will store longer and remain viable for years and other species will begin to lose their viability faster.