Rocky Mountain Gardening: Help Northwoods maple stalled out, 1 by picante

picante wrote:
We planted this red maple in Fall, 2004. It has been healthy, but this spring it is showing no sign of leafing out. It didn't bloom this April. We had a night of 8 degrees F about 5 weeks ago, and my nurseryman says it probably stalled out from the cold temp, since it had been in the 70s the week before.

I poured lukewarm water on it last week. Is there anything else I can do? It's clearly alive-- the branches are flexible and if I scratch with my fingernail, there is green under the bark.