Susan, Stardust is a beauty, I love the white eye in the center of the blooms. You can have more than one kind.
Another great one is Eye Candy, blooms from early summer until heavy frost.
All said, I find cooperii a most amazing delosperma. It is a fast growing one, stays covered in beautiful blooms that draw Bumble Bees, honey bees, butterflies, and lots of other beneficial tiny native bees. Mine is growing around other plants and I have never had it cause damage to the specie penstemon, sempervivum or Jovibarba. So far so good.
Connie, I think it is self fertile. Mine has been setting all kinds of see.
Loved your sleuthing link Greg, very interesting to read it.
