Lemon Ball is not hardy for me here, I may use it as soil cover in a pot with something else, love the color. I think it'd look good with a variegated Euphorbia milii with bright red blooms.
Celene, I thought you were saying that's your new ATP name??? You really had me going on that one! Okay 6A if that's what you want to be called So semps should do great for you! My zip code says I'm 8A, but I think I'm still a 7B...another couple of years of global warming and then I'll take the zone 8 or who knows by then it may even be a 9
I have bought at least three differently named ones that all looked the same and they all croaked. Not very hardy! I will "try" to not accidentally buy it again but it is so pretty. I guess one could consider as an annual and grow in a container where it can show off its stuff!