Grape Vione

This is my first effort at growing grapes. I have purchased two vines. 1, black, and the other green. Whilst the green vive is full of foliage, the black vine has lost all it's leaves. Is this normal. I have had the vines still in their pots in the greenhouse for the last two months until I can plant them out. Can anyone help with suggestions what to do.

 

Grape vines do lose their leaves, Milmar.
If you follow this link to the Ken Muir site, and click on the Ask Ken tab, select Grapes, you'll find cultivation notes about them, in PDF. I've always found this site to be very helpful about all types of fruit.
http://www.kenmuir.co.uk/

Here's a lovely photo of a vineyard in winter...
http://www.domaine-pelaquie.com/eng/seasons/winter.htm