To get a beautiful flower design or an arrangement, you don't need to show all of these three. The most important here is that your design has ornamental flowers; you will still get a terrific and an artistic flower arrangement.
Branches and tall foliage can also serve as line flowers. Most line flowers have blossoms graduating to buds at the top. Line flowers by themselves look stunning in cylindrical vases. Line flowers can give characteristic and creative importance to your designs.