Do I dig up Gladiolus in the Fall?

I had some beautiful glad's in my garden for two solid years. Last spring they didn't come up. Generally, I leave them in the ground over the winter.....but I"m wondering if I need to dig them up along with the Dahlia's?

Any tips on Gladiolus Care (which I've searched and had no luck . . . .yet ;) ) would be graciously received.

 

I am wondering, did you have your Gladiolas planted in the spot where soil remains saturated for a period of time in winter?

 

Good question but no. The drainage is pretty good.

Someone mentioned that sometimes Glad's just up n die after a few years. This may be the case????