Trees, Shrubs and Conifers: Early spring bloomers, 3 by Weerobin

Weerobin wrote:
I don\'t really worry about losing blooms to late frost, but I do care about it killing vulnerable early-leafed-out trees. I\'ve lost many fairly mature Japanese maples over the years due to late frost. I have several dwarf maples which are about 20 years old. Unfortunately they were nearly fully leafed-out. I covered them with sheets trying to give at least a little protection. I think most will survive, but one looks particularly awful. It\'s a beast of a dwarf with a spread of about 8ft, despite only being about 2ft tall. I looked it over thoroughly and only see about 3 tiny healthy fresh-looking leaves. Rest of the plant looks dismal. I guess time will tell.
Any suggestions to help it survive? My inclination is just to leave it alone.