A spray of flowers (rose's) is a number of flowers (rose's) on one stem or a branch. Whereas, a branch is the part of a tree that grows out from the main trunk and has leaves or flowers on it. Therefore, a spray of flowers grows off a branch. You would say "two sprays of rose's please" or you could just ask for two rose's or three roses or a dozen roses.

Do you mean a 'bunch' of roses? Similar, but spray sounds more fancy.

Hi, Branches of roses refers to the canes. So it means you are going to get two canes of roses/two roses Sprays are a collection of flowers arranged in a certain way, mostly round; for example an emblem. I hope this helps.