posted 7 years ago
Hello Wes,
If the roots are alive, and any dormant buds on the lower stem or root crown are alive, they will most likely wait untill temperatures are safe, then make a slow last ditch effort to grow. Are the brown leaves dead and crispy, or is the brown more of a hair covering over the still developing healthy live tissue? It sounds to me that those grapes have been stressed to the max, and if they've been grafted, your fruiting stock may already be dead. Its been a while, so I'm uncertain which, if any of those varieties you named are grafted. The additional stress those vines have been exposed to, could have some lingering consequences if they survive, resulting in slower establishment.
My personal recommendation would be to get more of the grape varieties your after, and plant them. Also keep trying with the ones you started already. If the stressed ones make it and eventually fruit properly, then your good to go with ample grapes. If the stressed ones produce unusable fruit, it means they were a grafted variety, and only your rootstock survived; however, if you kept your varieties labeled. You can propagate rootstock to match with the new fruiting stock of your replacement grapes. Then you can graft your own grapes, if you want to expand your Vinyard, or give them away as gifts.