hi everyone! We have been here in Arizona now for 5 years and I am still amazed at how fast plants grow here! Coming from the north where it takes years for a bush to grow big it's fun to finally have flowering plants all year round. I hope you all can help me with a citrus tree that is in my yard. Bought it as a "navel orange" but it's obviously not! Below is the fruit. It's the large yellow one. I included the medium orange and lemon for comparison. The leaves are large,green and glossy. Lots of large thorns. The fruit pulp is sour/tart. As you can see the skin is thick and dimply. Hope you all can help me! Thanks