As you may know, Phil was gone for a week and a half for work. While he was enjoying Memphis, Sue was "enjoying" having a house in shambles so the people could put in the hard wood floor. She was not able to have Mark and Jeff move the furniture back into its place because Phil still had to put the trim back up.
So Phil decided to send her flowers because he she was putting up with this and because he missed her. It's always hard to be gone for that long unless you can go together.
Phil is now home and the house is back in order.