I planted a kumquat in Halkidiki some years ago, but it did not survive, it was probably too exposed and windy. It was grafted on a Seville orange tree, however, which survived, my friendly neighbour pruned into a very nice shape. The tree is still quite small, but healthy, and produces oranges that are perfect for a very tasty marmelade. It would have been nice to have a kumquat, but I am very pleased with what I got.