This is my first post on the forum and thanks in advance for any advice I might receive.
I found a grapevine (Cabernet) back in 2012 when I lived in the Napa Valley. It was at the edge of a vineyard and after receiving permission from the owner, I dug it up and put it in a grow container. Had a decent size root ball and it is fairly easy to take out. I estimate that it was probably 20 years old at the time I dug it out. It has been a bonsai pot for approximately six years now but I have never been able to get a single grape to grow. The base is approximately 6 inches around.
Any thoughts or advice about what I can do to help it produce fruit?