Some seed comes up a lot sooner than others. Some you want 1/4 inch
deep, some much deeper. Most seeds are viable for years but it varies
considerably. Some will be viable for 2-3 years, some 7-8. You can test
your seed to see if it will sprout by putting it between a couple of
layers of moistened paper towel between two saucers for a few days and
observe if little white roots come out of them. The paper towels must
stay somewhat moist, so keep an eye on them.

Dan