Fast growing evergreen tree for zone 9.

by Dave
(Hilton Head, SC)

I am looking for a fast growing evergreen tree for the following location: zone 9, close to a marsh which is sometimes affected by a high tide but the rest of the time is surrounded by St Augustine grass. I have considered a variety of cypress. A Pindo palm was planted there which did not establish itself. The purpose is for privacy. Suggestions please. Thank you. Dave