I am new at this grape growing. I wanted to get some info, and hope its O.k. since I not a vineyard man. I tried years ago with out success, I believe it was do to Black Walnut trees. I just got couple plants to grow, I wanted to ask the pro's. I got these a couple days ago. They already came with leaves. Is it O.K. to plant them now? The temp has been any where from 30-50 degrees.