Yes, marigolds are a one time deal. And knowing the climate of that area, being from Bellingham originally, and having family on Camano Island, I would say your chances of having marigolds reseed themselves would be kind of iffy. You might get a few that would survive, but if I were you, I would go ahead and put a few seeds, or plants in the ground, just in case. I love the ferry ride across from Whidby to Port Townsend, by the way.
By
09/08/2009
I've let my marigold seeds go over the winter and they did not return the following spring. Perhaps the climate has something to do with that. Marigolds are classified as annuals. I always planted mine on outside row of garden. They are suppose to be a mosquito detractant.