The lifespan of a seed varies from plant to plant. Some seeds can be used for several years, while others should be thrown out. The germination rate of old seeds is usually about 50%, but if you want to maximize the germination rate, you can double the number of seeds. In addition, you should cull unused seed packets if the plants don't sprout. Depending on the type of seed, you can save up to 20 seeds for the next gardening season.. Website: https://dailyuploads.net/4yx6bmsv9tmc