I am bidding on a job for an HOA and they want perennials at the entrance of the subdivision. There are four areas that will require perennials the size of each one is 33' x 7' (231 sq ft). How do you figure on many perennials it will take for each area? What is the best to plant these areas are full sun. Located in Wake Forest, NC How would you price this job? Any input would be appreciated.