I don't know what kind of citrus
About three years ago, on the side of my yard was a small plant growing. I don't know how it got there. It was no more than four inches in height. it looked like a citrus so I left it there. Fast forward three years and that plant has grown to about ten feet tall. I have never watered it. It was thriving on complete neglect. And now it gave me blooms. Even though it's winter, here in southern California, we've been having an unusually warm winter.