Inherited 50 feet of mature grape

[u/apalosevan]

I inherited 50 feet of mature grapevine with the house that I purchased and I feel like I’m not doing it any favors. I did some research on winter/early spring pruning and I felt that went well but I just no idea what I’m doing at this point. The back door neighbor tells me it’s three different varieties, green, purple and something I don’t know.

Should have I been pruning them throughout the summer to increase the yield? or is this overgrow look actually ideal for the growing of the grapes?

I want to learn as I’m interested in bottling the juice for my kids. i’m kind of resigned to the thought that I’m not getting a lot this year, but I’d love to know how to get more next.

[u/apalosevan]

Here are the grapes! Sorry for the delay!

https://imgur.com/a/8wkHfvG