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["Lon J. Rombough" <lonrom@hevanet.com>]

The ones I had exhibited a "burst" growth habit that would be consistent with the climate where they originated.  They break bud early, bloom and start to  grow quickly, then about July first they set terminal buds and won't grow any more no matter how much water and fertilizer they get.  A selection of the local form broke bud after the Canadian material had bloomed, and continued to grow until early September.
Is the " burst" growth habit what you are seeing?
-Lon Rombough
Grapes, writing, consulting, my book, The Grape Grower, at http://www.bunchgrapes.com  Winner of the Garden Writers Association "Best Talent in Writing" award for 2003. 
For even more grape lessons, go to  http://www.grapeschool.com
For growing supplies and more;  http://www.grapegrowersolutions.com

On Jun 3, 2007, at 8:21 AM, Richard MURPHY wrote:

<x-tad-bigger> They are the slowest growing things I have ever seen, and this observation has been echoed elsewhere. </x-tad-bigger>