I'm new to growing fruits and was hoping if people could help. My family has a somewhat large lemon bush that I believe is Eureka. We have never done anything for it (maybe occasionally fertilize it) and it grows pretty much unattended. It's very vigorous but doesn't produce very good lemons (but a lot of them). The fruit is very yellow, and rather large, and the pith is incredibly thick. The new branches are near straight vertical and based on my preliminary research, I have heard that this is may be typical of Eureka.
It's probably due for a trim soon and the new branches are at least thumb size thickness. Assuming it's a Eureka, my question is whether or not these new branches would make suitable rootstock? I've tested them and they can root, just wondering if Eureka is a good base or if its a waste of time. I was hoping to use the rooted cuttings for later grafting other varieties onto in the future.