I'm thinking our zone difference, plus the poor growing conditions it's in, will keep it from getting too aggressive. At most since last year the length of the vines are longer, but it hasn't spread other than that. It's still just 1 lone plant in an odd spot. I also have some Virginia Creeper in the corner behind the garage that even after 6 years is still just a few scrawny plants in the same spot, hasn't spread at all.
Creeping Charlie on the other hand seems to want to take over my lawn. And that's fine with me, it's green, can walk on it, doesn't grow very tall and covers bare spots quickly. I'm expecting the Battle of the Greens when it eventually runs into the Bermuda grass that's taking over another section of the lawn, I'm curious who will win that one.
But, never say never. I will take your advice and keep an eye on it in case it suddenly decides to take off.
