I planted sweet peas in my Santa Cruz, CA garden in March and I've only seen one sprout! Why?

This is more or less the same time I've planted for several years with huge success.I have used essentially the same brand of seeds. We have had an inordinate amount of rain this year.

I planted sweet peas in my Santa Cruz, CA garden in March and I've only seen one sprout! Why?
As I recall, you guys had a really wet spring? It could be that with the combination of wet and cold weather, the seeds have rotted in the ground. If you replant now you should be okay.
Reply:because the seeds maybe old and not plantable. Or maybe its the soil.