I'll admit I know squat about grapes.. I bought two nice vine that have come along well.. I think.
Last year they spent all their effort putting down roots, I think. Almost no growth up top but they were growing, albeit slowwww.
This year the one vine that grew like 6 inches last year has sprouted up to my knee. The other, hardier vine is like a friggin wild bush! It's monsterously big..
So I started digging around and found this info. Shouldn't expect output for a while but it's all good- I get grapevine this fall when I prune.
I'll upload pictures of my out of control grape vines later.. It's too dark now, and I'm probably fit for grape shaming lol I should have investigated sooner, but at least now they have a solid root base, and I was able to mulch well this spring so they were able to weather out the drought this year like champs.
Notable link: great info on processing and canning:
http://extension.usu.edu/files/publications/publication/FN_2005_Harvest-11.pdf