9.Pluto- 39.4 AU why do astronomers not measure the distances to stars in kilometers? distance to stars are so great that the number are too large to work with easily.
Some seeds can last for three to four years, such as: 1  asparagus. 2  beans. 3  broccoli. 4  carrots. 5  celery. 6  leeks. 7  peas. 8  spinach.
Grass Seeds Can Last 2 Years or More. To answer the question â how long does grass seed last â it takes up years. Words of advice, however, is to use them within 2 years upon purchase. You can store those unused seeds for that long span of time.