Fallglo mandarin rootstock

I have a small Fallglo Mandarin. Or actually...I used to. While inspecting plants I brought in yesterday since it got COLD last night, I noticed that this plant has died above the grafted point.
What I'd like to know is if there's a "usual" rootstock used with these plants. It was bought at a local nursery and originated in FL.
The picture shows the dead portion and the sucker growth at the bottom. If there is a usual rootstock and it's a decent type, I'll keep it, if not, I'll probably giver it away.
Thanks,
Barb

Why not try your hand at regrafting? Perhaps your rootstock could be the host for several kinds of citrus in the future? It does not matter much if the first few attempts do not take, as you can always try again.

Oh, you're right. I had not thought of that. I've never tried grafting. Perhaps this could be my chance to try it.

There is an old gardening quote, I forget who said it, that goes something like "Any fool can graft". ( I always thought that was referring to politics.... :) ) Everybody should at least try it at some point in time. My grafts typically do not take, but once in awhile, they do and practice (or repetition) assures eventual success.

Well, hopefully I'm a fool! It is something I should learn. Time to start reading. etc, etc.....
I am also thinking that I should try to root the suckers. Who knows what they could be.

That looks really high to be the grafting point. It is usually an inch or two above the soil. I have a Navel orange that puts thorns on new growth sometimes. Are you sure there isnt a graft point under the soil?

Good luck grafting. I did it for the first time two years ago and had about a 70 percent success rate. There a lots of good vids on youtube about it.

The most important thing is to make sure the cambium layer of the new plant matches up exactly to the cambium layer of the rootstock plant. That is the tissue right under the bark. They will grow together eventually.

That does look high to me as well, but I do not do citrus, so do not know what height is usual there. However, it does look to me from the picture that one of the green stems emerges from the graft area. Just a heads up that sometimes you will get growth from within a graft zone that could be the rootstock, could be the graft or could be what is called a chimera, which can be a rare and weird combination of both the rootstock and the graft.

I have another citrus (an Algerian Clementine) that came from the same wholesaler in FL. The point that I think is the graft union is at the same height as this one. The plant has a bit of a bend at that point and the bark is different above.
Well, it is too cold to even poke your nose outside, so I guess I'll check out those youtube videos.
Barb