Benary Giant orange zinniasIT TAKES A VERY GOOD EYE to be able to arrange flowers of many colors in a single arrangement. Much easier (and often more striking) is a single-color theme. With zinnias, one of my favorite, easy summertime cutting flowers, this monochrome effect is best achieved by planting a single-color strain in the first place, such as the Benary’s Giant, instead of the usual mix. I favor orange, lime and crimson, but there is a wide range from white through several shades of pink, lilac-purple and vivid yellow.