Grape vines, anybody know a thing about grape vines?

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flushcut

TreeHouser
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So here’s the skinny my mom has two grape vines that are 40 years old and two things 1. They have never been properly pruned. And 2. The trellis supporting them is failing.
I’m wondering how heavy handed can I get with them without killing them? Can they be cut back to the stump and will they regenerate? Any help or links would be handy.
 
The main stem isn't salvageable? With a decent piece of that, you could train a good form going forward with less possible risk of killing it. I don't know anything about grapes though. Only what I can see from the road looking at professional vineyards, and it's been awhile since I regularly drove past one.

edit:
Thinking about wild grape though, it's almost impossible to kill that stuff. It just keeps growing, but the resulting vine might not make a good quality base for fruit production.
 
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It’s never been “trained” it looks more like a couch sized pile of spaghetti or every power pole in India. Lol

There is a vineyard I can stop by and ask for pointers.
 
Pictures help.
But, dont cut it all the way to the trunk.
You have to leave a few just under pencil sized runners along the trellis or wire that they need trained to. A little sapling tape helps. Not too tight. It'll wrap right round whatever you tie it to.
Going back to the trunk is too harsh for most things. Vineyard across the street leaves the runners about 4-8 feet depending.
Grandma had to trim her concords real regular to keep them off the house from across the drive way. Trellis went over the drive and doen a path. Was quite wonderful shade in summer. Big grapes, we'd harvest and make jelly. Heavy!
 
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I’d love gas lighting in my house. I have a lake custy who has gas lighting on the exterior and carriage house. It’s just a warm and inviting light, moth to flame kinda thing I guess.
 
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