There is a little ground cover called blue star creeper, from Australia, which
I have seen under the names Laurentia fluviatilis, Isotoma fluviatilis, and
Pratia pedunculata. I think the last is the correct name, but I'm not certain.
Incidentally, whatever it says in the books, it is hardy to Zone 5.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)