I think it means you don't have to do a lot of amending (compost, etc)
I would give the ground a little turn over or till to start, though.
I have succulents growing in the gaps between rocks (no amending there!)
You will still have to weed till the sedum spreads, unless you buy the sedum "tiles" that I saw at the big box store the other day. Nancy

Thanks, Nancy.

The spot I have in mind is a long bed running against my front curb. It gets really hot and dry there. The snapdragons I planted this spring aren't faring too well. Hopefully, considering sedum likes it dry and gravelly, I'll have better luck.