MrSeady, It likely wouldn't survive your zone 7a winters, especially if you have extended temperatures below 32ºF.
Karen, I'd be a multimillionaire if I could sell Arrowhead Vine!! It's highly invasive here and has taken over and killed out a bunch of saw palmettos on our property. We really need to hire someone to come out and clear the weedy areas and try to get rid of all the Syngonium and other invasives. We have a very large Staghorn Fern growing on a dead pine tree in the back corner of the yard. We had the top of the tree removed when we were having a lot of the big oaks trimmed before hurricane season a few years ago but I wouldn't let them take the pine tree all the way down because I didn't want to sacrifice the staghorn fern. Now, that green syngonium is completely taking over, climbing a huge oak tree and almost completely covering the staghorn fern.
I think I took this photo last year, I need to go out tomorrow and take another one because the staghorn isn't very visible now.