Ten plus years ago I started several key lime trees from seeds that came with grocery store purchased limes. When we moved to Guam, one of the trees, still in a pot, ended up with my parents. They planted it in their Tempe, Arizona yard. Eventually they sold the house to my brother and he inherited the tree.
About two years ago the tree started to fruit, and this fall had enough limes that I could harvest some to make a great tasting key lime pie. From those limes I saved seeds, planted them in my seed tent, and now one has germinated. Ten years from now, Lord willing, we'll be enjoying key lime pie produced from this little guy.