I live in the Denver area and a neighbor has a hen & chicks around his
mailbox that is thriving, but I tried one and managed to kill it because it
was getting water from the sprinkler system, even though I put it outside the
pattern.

We have a slop that the sprinkler doesn't cover though, but it does get snow
in the winter. Will they be ok there? ( full sun )

Can they spread out to large areas?