to ATP! I don't know anything about Ginkgo or Eucalyptus so I really can't help you there. It looks like you are located in the lower part of Zone 8b right on the edge of Zone 9a. I would think Dogwood do well for you. You said you have heavy clay which is what most of us on the Gulf Coast deal with, but what about what. I would think that it was fairly wet with your proximity to the Mississippi and the coast.