I am pretty sure it is sterile or at least wouldn't give you a plant anything like the parent. I've had a bunch of plants that I leave standing through winter and have never had a seedling. They are really easy to get new plants from pieces of roots though. When I've divided mine little pieces of roots seperated from the main plants turned into new plants.
So I guess I won't bother saving seed Will leave them for the Quail...But want to take for cuttings...They are pretty drought tolerant..I do want a shorter variety to grow as mine is older and falls over :(
Angel- I have never done it, but have read that if you pinch the Sedum back the first week of June or just whack it off (up to two thirds) it will not get as tall but will still bloom, without flopping. This advice is from Ciscoe Morris a gardening guru in Seattle.Then you don't need a different plant.