A guy I know gave me one of those little oranges to see if I could grow some trees from the seeds. The inside of the fruit is nothing but seeds. Well, I grew a couple of dozen in one gallon containers for a year or two, then threw them on the burn pile. Those thorns are ultra vicious. I never knew what they were called until I saw one of them on a nature trail at the Univ. of Ga. last year. It was labled as Hardy Orange.