The tree this came from started as a Meyer Lemon 16 years ago. I got two skimpy years of lemons on my patio. When I moved to a house, the plant went into the ground, with a few lemons. Three years later we had a big freeze that almost killed the tree. The result was the root stock came out and the tree survived. I never got another lemon off the tree.
Everything I read said the root stock should be sour orange, so it should be lemon or sour orange, right. What I got next was these super sweet, thick zipper skin orange fruits. Maybe it is some kind of satsuma, tangerine, type of orange ... but it certainly is not sour, and I like it better than the Lemon it started as. There are seeds in it, so it is not a typical satsuma.
After another freeze, thorny rootstock came out that produces a smaller orange fruit that is tart/sweet, but looks nothing like the other orange fruit. What is going on with my tree?