Last year was another difficult drought year in Oklahoma. So last year's succulents didn't survive the full year.
This year, I bought a mat of young succulents and sedum varieties mixed together. It comes with a coconut fiber backing, and I only had to cut it to shape. I also bought some small gravel like you would use in an aquarium to cover the soil and help retail any moisture for a bit longer.
Connie and I put them out on family graves and in the little flower urns. I happened to be in town and checked on them about 2 weeks later, and look how they're blooming! Of course, this has been an unbelievably rainy and cool couple of weeks, so it's not much of a test yet.