We have about 15 Knock Out roses against a split rail fence, pretty much all in a row. Zone 6. Very sunny on one end, part shade on the other end. I would like to bring most of the roses into the sunny end (at the left in the photo) and design a perennial garden in the space around the roses that will flow through the whole area. Area is about 30 ft. long x 6-7 ft. wide. I know plants and can take care of them nicely but I'm a design dunce!