oh but maybe some fruits could have healing effects? or cure poisoning, if that mechanics is added?
Really, the coconut palm is passable because it has shallow roots and is salt tolerant. But citrus trees on a raft? I don't think that would wash. Scurvy only sets in after months at sea, and I really don't play this game for that long. Besides, you could get vitamin c from growing bell peppers You don't need trees.