We’re next door to you, in 9a, Bama Coast, and have had great luck with seeds from our kumquats and lemons. They can take a while to germinate – even as long as a month or two, after we’d given up. One of our kids did it on a whim (and named them…), so I don’t have experience to share from an outside garden. She seeded them indoors, and later they go to the porch where they have never been potted up from their one-gallon pots. This could be why (I don’t know) they haven’t fruited yet – her little 3 year old trees don’t show signs of flowering or fruiting yet. But they’re still lovely little evergreen trees and show signs of growing much more quickly in the future!