Experiment With Color CombinationsWhile mixing greens or reds can be tricky, combining different purples is usually an easy task. Though purples don't generally clash, when in doubt, go with shades that are similar in tone or hue but vary in intensity (think of the varying shades on a color sample from the paint store).Matching a purple that has a pink undertone, such as society garlic (Tulbachia violacea), with a purple that has a blue undertone, such as African lily (Agapanthus africanus) results in mix that highlights both colors. White varieties of African lilies scattered throughout a planting bed also help bridge the gap between the two shades of purple.