On Mon, 06 Apr 2009 17:32:16 -0500, Dymphna wrote:

How do you know when you have to prune them? I have had these two vines
for 3 years now. I got my first grapes off of them this past fall. I
know you are supposed to prune them at some time, but not sure when.

Between Christmas day and new year's eve, traditionally. It's much too
late now.