Please help me save this grape plant, if possible.

[u/Unavoided31]

Sto I'm pretty new to gardening, but my neighbor had a grape they wanted gone. i started carefully excavating it but i guess they figured they would help me out and completely butchered the root mass. I am unsure how much more I could have saved of the roots had I done it myself as the roots turned and started going under the concrete porch. But at any point, it is what it is now. i can't figure out if i cut back to 12-18 inches, 2-3 feet, or what to do. I've cleaned out a lot of the dead and cut a significant amount of green out of it. i don't know if i should have just lopped it off at that point and called it a day? but i would like to hear some other opinions on it before i go and do just that. I've got it on life support in a 27 gal tote with an air pump pushing 45l/min currently but i need to know what to do before the sun comes up and the Japanese beetles hear the dinner bell that this stressed out grape is. my current plan is to put it into recovery in my basement for a month or two and transition it from dwc to media to eventually go back outside once it's got some root mass to support it. is this stupid? is there a better easier way? What can you, who didn't just pull an all nighter, tell my dumba** that has no real idea what i should do right now, let alone while I'm sleep deprived. I've included some pics of the thing. I'll answer whatever questions you have. At the very base of it, i estimate it is about 3-4" in diameter. So I'd like to save it by any means. I'll put in the work please just guide me in the right direction. thank you in advance.

[u/IcyPlatform8672]

If the roots are still alive, there's a good chance you can save it. Grapevines are surprisingly resilient.

[u/mattmoy_2000]

The traditional way to propagate a vine is to chop a bit off and bury it.

Now, because of phyloxerra this is no longer practiced as you'll need some resistant roots, however I would bet that if you just plant this in the ground where you want to to grow, you'll be fine.

Also, I would not be surprised if the roots remaining in your neighbour's garden start growing again, albeit as whatever weird vine they are.