It worked! A week of "hanging out" with 2 Japanese Maple seedlings & our Flowering Dogwood is perky, looking healthy & putting out new growth.
Like the Acer's, he doesn't want too much exposure to direct sun, seems to get along better with partial sun..really likes "dappled shade" & shows it.
I expect to see some real growth now that we've figured out just how the Dogwood likes to be treated. The question now is how he will handle the heat, this summer