Marilyn, good question, (I'm guessing here, but think its right, however as some people say "I could be wrong!" :thumbsup:) I think semps with their rosette shape are more susceptible to rotting due to water, especially compared with the type of sedum that they're talking about here, which is similar to the rupestre in that they look like feathers or fir branches. I would guess that these sedums would be very carefree in pretty much any environment, with some shade from hot sun in summer (in locations that have high temps) That's my 2 cents!