We must admit to a fondness for blue flowers. Adenophora is a genus in the Bellflower family, with about 40 species that are hard to tell from Campanulas unless you are a botanist. By far the best is our old friend, A. confuse, or Ladybells, a lovely plant whose 36-40in stems bear rows of large, purplish blue flowers in July and August. This is another excellent blue with no enemies on the color wheel, and it's an easy keeper in full sun or partial shade and evenly moist but well-drained soil. (It struggles in the arid heat of the desert Southwest.) Gardeners in the South may find that a little goes a long way. The excess can be spaded up in spring.